TW202001353A - Lens element - Google Patents

Abstract

A lens element intended to be worn in front of an eye of a person comprising: - a prescription portion having a first refractive power based on a prescription for correcting an abnormal refraction of said eye of the person and a second refractive power different from the first refractive power; - a plurality of at least three optical elements, at least one optical element having an optical function of not focusing an image on the retina of the eye so as to slow down the progression of the abnormal refraction of the eye.

Description

Lens element

The present invention relates to a lens element which is intended to be worn in front of the human eye in order to suppress the development of eye refractive errors such as myopia or hyperopia.

The characteristic of myopia of the eye is that the eye focuses distant objects in front of its retina. Concave lenses are often used to correct myopia, and convex lenses are often used to correct hyperopia.

It has been observed that some individuals are inaccurately focused when using conventional single vision optical lenses for correction, especially when children observe objects located at close distances (ie, under near vision conditions). Because of this focus defect in a part of myopic children corrected for hyperopia, images of nearby objects are formed behind the retina (even in the fovea).

This focus defect may have an impact on the development of myopia in such individuals. It can be observed that for most of the individuals, myopic defects tend to worsen over time.

The foveal vision corresponds to the observation status of the image of the object viewed by the eye formed in the central area of the retina called the fovea.

Peripheral vision corresponds to the perception of scene elements that are laterally offset with respect to the object being viewed, and images of the elements are formed on the peripheral area of the retina, away from the fovea.

The ophthalmic correction provided to subjects with refractive errors is usually suitable for his foveal vision. However, it is known that relative to the correction determined for foveal vision, the correction must be reduced for peripheral vision. In particular, studies conducted on monkeys have shown that significant light defocusing behind the retina that occurs away from the fovea may cause the retina of the eye to elongate, and thus may cause aggravation of myopia defects.

Therefore, there seems to be a need for a lens element that can suppress or at least slow down the development of refractive errors such as myopia or hyperopia.

To this end, the present invention proposes a lens element intended to be worn in front of the wearer's eyes under standard wearing conditions, the lens element comprising: -A prescription section configured to provide the wearer with a first optical power for foveal vision based on the wearer's prescription for correcting the refractive error of the wearer's eye; -A plurality of at least three optical elements, at least one optical element has an optical function for peripheral vision that does not focus the image on the retina of the eye, so as to slow down the development of the refractive error of the eye.

Advantageously, having an optical element configured to not focus the image on the wearer's retina for peripheral vision reduces the natural tendency of the eye's retinal deformation, especially elongation. Therefore, the development of the eye's refractive error is slowed.

According to additional embodiments that can be considered individually or in combination: -At least one, for example, all of the optical elements have an optical function under standard wearing conditions and focus the image on a position outside the retina for peripheral vision; and/or -At least one optical element has aspheric focusing optical function for peripheral vision under standard wearing conditions; and/or -At least one of the optical elements has cylindrical power; and/or -The optical elements are configured such that along at least one section of the lens, the average spherical mirror of the optical element increases from the point of the section towards the peripheral portion of the section; and/or -The optical elements are configured such that along at least one section of the lens, the lenticular of the optical element increases from the point of the section towards the peripheral portion of the section; and/or -The optical elements are configured such that along at least one section of the lens, the average spherical mirror and/or cylindrical lens of the optical element increases from the center of the section toward the peripheral portion of the section; and/ or -The prescription part includes an optical center, and the optical elements are configured such that along any section passing through the optical center of the lens, the average spherical and/or cylindrical lenses of the optical elements are directed from the optical center toward the The peripheral portion of the lens is enlarged; and/or -The prescription part includes a farsighted reference point, a nearsighted reference point, and a meridian connecting the farsighted reference point and the nearsighted reference point, the optical elements are configured such that any lens along the lens under standard wearing conditions A horizontal section, the average spherical mirror and/or average cylindrical lens of the optical elements increase from the intersection of the horizontal section and the meridian toward the peripheral portion of the lens; and/or -The average spherical and/or cylindrical lens enlargement function along the sections varies according to the position of the section along the meridian; and/or -The average sphere and/or cylinder increase function along these sections is asymmetric; and/or -The optical elements are configured such that under standard wearing conditions, the at least one section is a horizontal section; and/or -The average spherical mirror and/or cylindrical lens of the optical element increases from the first point of the section towards the peripheral portion of the section, and from the second point of the section towards the peripheral portion of the section Decrease, the second point is closer to the peripheral portion of the section than the first point; and/or -The average spherical mirror and/or cylindrical lens enlargement function along the at least one section is a Gaussian function; and/or -The average spherical mirror and/or cylindrical lens enlargement function along the at least one section is a quadratic function; and/or -The optical elements are configured so that the average focus of the light passing through each optical element is at the same distance from the retina; and/or -The prescription part is formed as a part other than the part formed as the plurality of optical elements; and/or -For each circular zone with a radius comprised between 2 mm and 4 mm, including a reference frame located at a distance greater than or equal to the radius + 5 mm from the pupil facing the user who is looking straight ahead under standard wearing conditions The geometric center at the distance, the ratio between the sum of the areas of the optical element portions located in the circular area and the area of the circular area is between 20% and 70%; and/or -The at least three optical elements are discontinuous; and/or -At least a part, for example, all of these optical elements are located on the front surface of the ophthalmic lens; and/or -At least a part, for example, all of these optical elements are located on the rear surface of the ophthalmic lens; and/or -At least a part, for example, all of these optical elements are located between the front and back surfaces of the ophthalmic lens; and/or -At least one of the optical elements is a multifocal refractive microlens; and/or -The at least one multifocal refractive microlens includes an aspheric surface, with or without any rotational symmetry; and/or -At least one of the optical elements is a toric refractive microlens; and/or -The at least one multifocal refractive microlens includes a toric surface; and/or -The at least one multifocal refractive microlens includes cylindrical power; and/or -At least one of the optical elements is made of birefringent material; and/or -At least one of the optical elements is a diffractive lens; and/or -The at least one diffractive lens includes a metasurface structure; and/or -The shape of at least one optical element is configured to form a caustic point in front of the retina of the human eye; and/or -At least one optical element is a multi-focus binary component; and/or -At least one optical element is a graphic element lens; and/or -At least one optical element is a π-Fresnel lens; and/or -At least a part, for example, all optical functions including high-order optical aberrations; and/or -The lens element includes an ophthalmic lens carrying a prescription part and a clip carrying an optical element adapted to be removably attached to the ophthalmic lens when the lens element is worn; and/or -These optical elements have an external shape that can be inscribed in a circle with a diameter greater than or equal to 0.8 mm and less than or equal to 3.0 mm; and/or -The prescription part is further configured to provide the wearer with a second optical power different from the first optical power for foveal vision under standard wearing conditions; and/or -The difference between the first power and the second power is greater than or equal to 0.5 D; and/or -At least one, for example at least 70%, for example all optical elements are active optical elements that can be activated by the optical lens controller device; and/or -The active optical element comprises a material with a variable refractive index, the value of the refractive index is controlled by the optical lens controller device, and/or -The optical components are located on the Internet; and/or -The network is a structured network; and/or -The structured network is a square network or a hexagonal network or a triangular network or an octagonal network; and/or -The lens element further comprises at least four optical elements, which are organized into at least two sets of optical elements; and/or -Each group of optical elements is organized into at least two concentric rings with the same center, the concentric rings of each group of optical elements are composed of the inner diameter of the smallest circle corresponding to the optical element tangent to at least one of the groups and corresponding to The outer diameter of the largest circle tangent to at least one of the optical elements in the group is defined; and/or -At least a part, for example a concentric ring of all optical elements, centered on the optical center of the surface of the lens element, said optical element being arranged on said lens element; and/or -The diameter of the concentric ring of optical elements is between 9.0 mm and 60 mm; and/or -The distance between two consecutive optical elements concentric rings is greater than or equal to 5.0 mm, the distance between two consecutive concentric rings is defined by the difference between the inner diameter of the first concentric ring and the outer diameter of the second concentric ring, the second The concentric ring is closer to the periphery of the lens element.

The invention further relates to a method for determining a lens element suitable for slowing the development of the refractive error of the wearer's eye, the method comprising: -A step of providing prescription data of the wearer, during this step, providing prescription data of the wearer related to the prescription of the wearer, -A step of providing wearing condition data, during which the wearing condition data related to the condition of wearing the lens element by the wearer, -A step of providing the wearer's retina data, during this step, providing retina data related to the shape of the wearer's retina in the same reference system as the wearing conditions, -A lens element determination step, during which a lens element including a prescription part and a plurality of at least three optical elements is determined so that the prescription part is under the wearing conditions corresponding to the wearing data and for the foveal vision The first optical power is provided based on the wearer's prescription, and at least one optical element has an optical function of not focusing the image on the retina of the eye for peripheral vision.

Advantageously, the method of the invention allows the use of ray tracing to control the refraction of light under peripheral vision through optical elements. Therefore, it may be decided to have an optical element to focus light or not focus light in front of the wearer's retina. Standard or customized conditions can be considered, such as wearing conditions or the shape of the retina.

In addition, the method of the present invention allows the average focus or point or minimum and maximum range to be controlled by the optical element at a distance from the retina under specific wearing conditions, and considers the wearer's retina and depends on the eccentricity.

For example, for spherical optical elements, the method of the present invention allows the determination of the peripheral astigmatism image of the retina with an optimal focus of 2D.

For example, for a toric optical element, the method of the present invention allows to determine the peripheral point image, regardless of the position of the optical element, the optimal focus is always 3D.

According to additional embodiments that can be considered individually or in combination: -During the lens element determination step, determine at least 50%, for example at least 80% of the optical elements to focus the image at a given distance from the retina; and/or -During the lens element determination step, determine at least 50%, for example at least 80%, of the optical elements to focus the image at the same distance from the retina along the axis connecting the reference point of each optical element and the center of the wearer's pupil Office; and/or -The wearing condition data provided during the wearing condition data providing step corresponds to the standard wearing conditions; and/or -The wearing condition data provided during the wearing condition data providing step corresponds to the wearing condition measured on the wearer; and/or -The wearer's retina data provided during the wearer's retina data providing step corresponds to the standard retina shape; and/or -The wearer's retina data provided during the wearer's retina data providing step corresponds to the shape of the retina measured on the wearer; and/or -The method further includes an anterior surface data providing step during which an anterior surface data representing the anterior surface of the lens element is provided, and wherein, during the lens element determination step, the shape of the posterior surface and the place to be placed are determined An optical element on the front surface, such that the prescription portion provides a first optical power based on the wearer's prescription for foveal vision under the wearing conditions corresponding to the wearing data, and at least one optical element It has the optical function of not focusing the image on the retina of the eye for peripheral vision.

The invention relates to a lens element which is intended to be worn in front of the wearer's eyes.

In the remainder of this manual, you can use terms such as "upper", "bottom", "horizontal", "vertical", "upper", "lower", "front", "back", or other instructions for relative positions Word. Understand the terms under the lens element wearing conditions.

In the context of the present invention, the term "lens element" may refer to uncut optical lenses or spectacle optical lenses or ophthalmic lenses that are edged to fit a particular spectacle frame and optical devices suitable for positioning on ophthalmic lenses. The optical device can be positioned on the front or back surface of the ophthalmic lens. The optical device may be an optical patch. The optical device may be adapted to be removably positioned on the ophthalmic lens, such as a clip, which is configured to be clipped on a spectacle frame including the ophthalmic lens.

The lens element 10 according to the present invention is suitable for a wearer and is intended to be worn in front of the wearer's eyes.

As represented in FIG. 1, the lens element 10 according to the present invention includes: -Prescription section 12, and -A plurality of at least three optical elements 14.

The prescription section 12 is configured to provide the first power to the wearer under standard wearing conditions and for foveal vision based on the wearer's prescription for correcting the wearer's refractive error of the eye.

The wearing condition should be understood as the position of the lens element relative to the wearer's eye, such as from anterior tilt, corneal to lens distance, pupil to cornea distance, eye rotation center (CRE) to pupil distance, CRE to lens distance, and package Angle to define.

The corneal-to-lens distance is the distance between the cornea and the posterior surface of the lens along the visual axis of the eye in the first eye position (usually regarded as horizontal), for example equal to 12 mm.

The distance between the pupil and the cornea is the distance between the pupil and the cornea along the visual axis of the eye, which is usually equal to 2 mm.

The distance from the CRE to the pupil is the distance between the center of rotation (CRE) and the cornea along the visual axis of the eye, for example equal to 11.5 mm.

The CRE to lens distance is the distance between the CRE of the eye and the posterior surface of the lens along the visual axis of the eye in the first eye position (usually regarded as horizontal), for example equal to 25.5 mm.

The anteversion angle is at the intersection between the rear surface of the lens and the visual axis of the eye in the first eye position (usually regarded as horizontal), the normal to the rear surface of the lens and the eye in the first eye position The angle between the visual axis of the eyes on the vertical plane, for example, equal to 8°.

The wrap angle is at the intersection between the rear surface of the lens and the visual axis of the eye in the first eye position (usually regarded as horizontal), the normal to the rear surface of the lens and the first eye position The angle between the eye's visual axis and the horizontal plane, such as 0°.

Examples of standard wearer conditions can be 8° anteversion angle, 12 mm cornea to lens distance, 2 mm pupil-corneal distance, 11.5 mm CRE to pupil distance, 25.5 mm CRE to lens distance, and 0° The angle of the package is limited.

The term "prescription" should be understood to refer to a set of optical characteristics of power, astigmatism, and prism deviations, which are determined by an ophthalmologist or optometrist in order to correct the eyes, for example, by means of lenses positioned in front of the wearer's eyes Visual impairment. For example, the prescription for myopia includes the power value and the astigmatism value with an axial position for distance vision.

Although the present invention does not relate to progressive lenses, the wording used in the present specification for progressive lenses is shown in FIGS. 1 to 10 of document WO 2016/146590. The technician can adjust these definitions for single vision lenses.

A gradient lens includes at least one but preferably two non-rotationally symmetric aspheric surfaces, such as but not limited to a gradient surface, a regression surface, a toric surface, or a non-toric surface.

其中Rmax為局部最大曲率半徑，用米來表示，並且CURVmin用屈光度來表示。It is known that the minimum curvature CURVmin at any point on the aspheric surface is defined by the following formula:

Where Rmax is the local maximum radius of curvature, expressed in meters, and CURVmin is expressed in diopters.

其中Rmin為局部最小曲率半徑，用米來表示，並且CURVmax用屈光度來表示。Similarly, the maximum curvature CURVmax at any point on the aspheric surface can be defined by the following formula:

Where Rmin is the local minimum radius of curvature, expressed in meters, and CURVmax is expressed in diopters.

It can be noted that when the surface is partially spherical, the local minimum radius of curvature Rmin and the local maximum radius of curvature Rmax are the same, and accordingly, the minimum and maximum curvatures CURVmin and CURVmax are also the same. When the surface is aspheric, the local minimum radius of curvature Rmin and the local maximum radius of curvature Rmax are different.

Based on these equations of minimum curvature CURVmin and maximum curvature CURVmax, the minimum and maximum spherical mirrors labeled SPHmin and SPHmax can be inferred from the type of surface considered.

，以及

其中，n為鏡片的成分材料的折射率。When the surface under consideration is the object-side surface (also called the front surface), the equations are as follows:

,as well as

Where n is the refractive index of the component material of the lens.

以及

其中，n為鏡片的成分材料的折射率。If the surface under consideration is the side surface of the eyeball (also called the posterior surface), the equations are as follows:

as well as

Where n is the refractive index of the component material of the lens.

As is well known, the average spherical mirror SPHmean at any point on the aspheric surface can also be defined by the following formula:

Therefore, the expression of the average spherical mirror depends on the surface under consideration:

If the surface is an object-side surface, then

還藉由公式

定義柱鏡CYL。If the surface is the side surface of the eyeball, then

Also by formula

Define the CYL cylinder.

The characteristics of any aspheric surface of the lens can be expressed by means of a local average spherical lens and a cylindrical lens. When the lenticular lens is at least 0.25 diopters, the surface can be considered to be partially aspheric.

For an aspheric surface, the local cylindrical axis position γAX can be further defined. Fig. 7a shows the astigmatic axis position γ defined in the TABO convention, and Fig. 7b shows the cylindrical axis position γAX in the convention defined for characterizing aspheric surfaces.

Cylindrical axis position γAX is the angle of orientation of the maximum curvature CURVmax relative to the reference axis position and in the selected rotation direction. In the convention defined above, the reference axis is horizontal (the angle of the reference axis is 0°) and the direction of rotation is counterclockwise for each eye when looking at the wearer (0° ≤ γAX ≤ 180°). Therefore, the +45° cylinder axis γAX axis value represents an obliquely oriented axis that extends from the quadrant located at the upper right to the quadrant located at the lower left when looking at the wearer.

In addition, considering the condition of the person wearing the lens, the progressive multifocal lens can also be defined by optical characteristics.

Figures 8 and 9 are diagrammatic representations of the optical system of the eye and lens, thus showing the definitions used in this specification. More precisely, Figure 8 shows a perspective view of such a system, showing the parameters α and β used to define the gaze direction. Fig. 9 is a vertical plan view parallel to the front and rear axes of the wearer's head, and the vertical plane passes through the eye rotation center when the parameter β is equal to 0.

Mark the center of eye rotation as Q’. The axis Q'F' shown with a chain line in Fig. 9 is a horizontal axis passing through the center of eye rotation and extending in front of the wearer, that is, the axis Q'F' corresponding to the main gaze angle. This axis cuts the aspherical surface of the lens at a point called the optician cross, which exists on the lens and enables the optician to position the lens in the frame. The intersection of the rear surface of the lens and the axis Q'F' is the point O. If O is located on the rear surface, it can be an optic cross. A top ball having a center Q'and a radius q'is tangent to the rear surface of the lens at a point on the horizontal axis. As an example, the value of the radius q'of 25.5 mm corresponds to a commonly used value, and provides satisfactory results when the lens is worn.

The given gaze direction—represented by the solid line in FIG. 8—corresponds to the position where the eye rotates around Q'and the point J of the top ball; the angle β is on the axis Q'F' and the straight line Q'J includes the axis Q' The angle formed between the projections on the horizontal plane of F'; this angle appears on the schematic diagram of FIG. 3. The angle α is the angle formed between the axis Q'J and the projection of the straight line Q'J on the horizontal plane including the axis Q'F'; this angle appears on the schematic diagrams of FIGS. 8 and 9. Therefore, a given attention view corresponds to the point J of the top ball or to a pair (α, β). If the value of the gaze lowering angle is greater in the positive direction, the gaze decreases more; and if the value is greater in the negative direction, the gaze increases more.

In a given gaze direction, an image of a point M at a given object distance in object space is formed between two points S and T corresponding to a minimum distance JS and a maximum distance JT, the minimum distance and the maximum distance It will be sagittal local focal length and tangential local focal length. At point F', an image of a point at infinity in object space is formed. The distance D corresponds to the posterior coronal plane of the lens.

The Ergorama function is a function that relates the usual distance of an object point to each gaze direction. Typically, in the view distance following the main gaze direction, the object point is at infinity. In the near vision following a gaze direction that substantially corresponds to the gaze direction at an angle α of approximately 35° and an angle β of approximately 5° toward the nose side, the object distance is approximately 30 cm to 50 cm. In order to know more details about the possible definition of the Igma function, one can consider US patent US-A-6,318,859. This document describes the Igma function, its definition and its modeling method. For the method of the invention, the point may be at infinity or not at infinity. The Egma function may be a function of the wearer's refractive error or the wearer's add light.

Use these elements to define the wearer's power and astigmatism in each gaze direction. For the gaze direction (α, β), consider the object point M at the object distance given by the Sigma function. The object proximity ProxO is defined as the reciprocal of the distance MJ between the point M and the point J of the top ball in the object space for the point M on the corresponding ray: ProxO = 1/MJ

This makes it possible to calculate the object's proximity within a thin lens approximation for all points of the top ball, which thin lens approximation is used to determine the Egma function. For a real lens, object proximity can be regarded as the reciprocal of the distance between the object point on the corresponding light and the front surface of the lens.

For the same gaze direction (α, β), the image of point M with a given object's proximity is formed at two points S corresponding to the minimum focal length and maximum focal length (which will be sagittal focal length and tangential focal length), respectively And T. The quantity ProxI is called the image proximity of point M:

By analogy with thin lenses, for a given gaze direction and a given object proximity, that is, for a point of the object space on the corresponding light, the power Pui can be defined as the image proximity and the object proximity with.

With the same symbol notation, astigmatism Ast is defined as:

This definition corresponds to the astigmatism of the light beam produced by the lens. It can be noted that this definition gives typical values of astigmatism in the main gaze direction. The astigmatism angle γ, which is usually called the axial position. The angle γ is measured in the reference frame {Q', xm, ym, zm} associated with the eye. It corresponds to the angle by which the image S or T is formed, and this angle depends on the convention used in the direction zm in conjunction with the plane {Q', zm, ym}.

Considering the light passing through the center of rotation of the wearer's eyes, the power and astigmatism have been defined for foveal vision.

Considering the light passing through the center of the wearer's pupil shown in Fig. 10a, the power and astigmatism can be defined for peripheral vision in a similar manner.

Under wearing conditions, the possible definitions of lens power and astigmatism can therefore be calculated as explained in the paper by B. Bourdoncle et al. The title of the paper is "Ray tracing through gradient ophthalmic lenses [Ray tracing through progressive ophthalmic lenses]” (1990 International Lens Design Conference, edited by DT Moore, British Proceedings of Opto-Optical Instruments).

The prescription portion 12 may be further configured to provide the wearer with a second power for the foveal vision based on the wearer's direction for the foveal vision, which is different from the first power.

In the sense of the present invention, when the difference between the two powers is greater than or equal to 0.5 D, the two powers are considered to be different.

When the abnormal refractive power of the human eye corresponds to myopia, the second power is greater than the first power.

When the abnormal refractive power of the human eye corresponds to hyperopia, the second optical power is smaller than the first optical power.

The prescription part is preferably formed as a part other than the part formed as a plurality of optical elements. In other words, the prescription part is a part complementary to the part formed by the plurality of optical elements.

The prescription part may have a continuous power change. For example, the prescription part may have a gradient multi-focus design.

The optical design of the prescription section may include -Optician cross, where the optical power is negative; -The first zone, which extends on the temporal side of the prescription part when the wearer wears the lens element. In the first zone, when extending towards the temporal side, the optical power increases, and on the nasal side of the lens, the optical power of the ophthalmic lens is substantially the same as that at the cross of the optician.

This optical design is disclosed in more detail in WO 2016/107919.

Alternatively, the power in the prescription portion may include at least one discontinuity.

As shown in Fig. 1, the lens element can be divided into five complementary zones: a central zone 16, the power of which is equal to the first refractive power; four quadrants Q1, Q2, Q3, Q4 at 45°, at least one The quadrant has at least a point where the power is equal to the second power.

In the sense of the present invention, according to the TABO convention shown in FIG. 1, "quadrant at 45°" should be understood as a 90° equiangular quadrant oriented in the direction of 45°/225° and 135°/315°.

Preferably, the central zone 16 includes a frame reference point and has a diameter greater than or equal to 4 mm and less than or equal to 22 mm, the frame reference point facing the pupil of the wearer looking straight ahead under standard wearing conditions.

According to an embodiment of the present invention, at least the lower quadrant Q4 has a second optical power for central vision, which is different from the first optical power that conforms to the prescription for correcting refractive errors.

For example, the prescription part has a gradient multifocal refractive function. The gradient multifocal refractive function can extend between the upper quadrant Q2 and the lower quadrant Q4.

Advantageously, such a configuration allows to compensate for adjustment lag when a person is viewing at close range, for example due to the addition of lenses.

According to an embodiment, at least one of the temporal quadrant Q3 and the nasal quadrant Q1 has a second optical power. For example, the temporal quadrant Q3 has a power change with the lens eccentricity.

Advantageously, this configuration improves the efficiency of the control of refractive error in peripheral vision and has a greater effect on the horizontal axis.

According to an embodiment, the four quadrants Q1, Q2, Q3, and Q4 have concentric power gradients.

According to an embodiment of the present invention, the central area of the lens corresponds to the area centered on the optical center of the lens element, excluding the optical element. For example, the lens element may include an empty area centered on the optical center of the lens element and having a diameter equal to 0.9 mm, which does not include the optical element.

The optical center of the lens element may correspond to the fitting point of the lens.

Alternatively, the optical element may be provided on the entire surface of the lens element.

At least one of the plurality of at least three optical elements 14 has an optical function for peripheral vision without focusing the image on the retina of the wearer's eye.

In the sense of the present invention, "focusing" should be understood as producing a focusing spot with a circular cross-section, which can be reduced to a point in the focal plane.

Advantageously, this optical function of the optical element reduces the deformation of the retina of the wearer's eye under peripheral vision, allowing to slow the development of refractive errors in the eye of the person wearing the lens element.

The optical element may be a discontinuous optical element as shown in FIG. 1.

In the sense of the present invention, if all the paths supported by the surface of the lens element and connecting the two optical elements located on the surface of the lens element are followed, then the two optical elements are discontinuous and one optical element arrives The underlying data surface on which the optical element is located.

When the surface on which the at least two optical elements are located is a spherical surface, the basic data surface corresponds to the spherical surface. In other words, if all paths connecting two optical elements located on a spherical surface and supported by the spherical surface are followed, the two optical elements are discontinuous, and one optical element reaches the spherical surface.

When the surface on which at least two optical elements are located is an aspherical surface, the basic data surface corresponds to a partially spherical surface that is most suitable for the aspherical surface. In other words, if all the paths connecting the two optical elements on the aspherical surface and supported by the aspherical surface are followed, the two optical elements are discontinuous, and one optical element reaches the spherical surface most suitable for the aspherical surface surface.

As represented in FIG. 12, the plurality of optical elements 14 may include at least two consecutive optical elements.

In the sense of the present invention, if there are all paths supported by the surface of the lens element, connecting the two optical elements located on the surface of the lens element, the two optical elements are continuous, and if Path, an optical element does not reach the underlying data surface where the optical element is located.

When the surface on which the at least two optical elements are located is a spherical surface, the basic data surface corresponds to the spherical surface. In other words, if there is a path supported by a spherical surface and connecting two optical elements located on the spherical surface, the two optical elements are continuous, and if along the path, one optical element may not reach the Spherical surface.

When the surface on which at least two optical elements are located is an aspherical surface, the basic data surface corresponds to the partially spherical surface that is most suitable for the aspherical surface. In other words, if there is a path supported by an aspheric surface and connecting two optical elements located on the aspheric surface, the two optical elements are continuous, and if along the path, one optical element may not Reach the spherical surface best suited to the aspherical surface.

Advantageously, having a continuous optical element helps to improve the aesthetics of the lens element and is easier to manufacture.

At least one of the plurality of optical elements 14, preferably all optical elements have an optical function of not focusing the image on the retina of the wearer's eye, especially for peripheral vision and preferably central vision and peripheral vision.

Advantageously, this optical function of the optical element reduces the deformation of the retina of the wearer's eye under peripheral vision, allowing to slow the development of refractive errors in the eye of the person wearing the lens element.

According to a preferred embodiment of the present invention, at least two consecutive optical elements are independent.

In the sense of the present invention, if an independent image is produced, then the two optical elements are considered to be independent.

In particular, when "under central vision" is illuminated by a parallel beam, each "independent continuous optical element" forms a spot associated with it on a plane in image space. In other words, when one of the "optical elements" is hidden, the spots will disappear even if this optical element is continuous with the other optical element.

For the classic Fresnel earrings disclosed in US 7976158 (with a single power), the Fresnel earrings produce a single spot, and if a small part of the ring is hidden, the spot position will not change. Therefore, Fresnel earrings cannot be considered as a series of "independent continuous optical elements". According to an embodiment of the present invention, the optical element has a specific size. In particular, the optical elements have an external shape that can be inscribed in a circle with a diameter greater than or equal to 0.8 mm and less than or equal to 3.0 mm, preferably greater than or equal to 1.0 mm and less than 2.0 mm.

According to an embodiment of the invention, the optical element is located on the network.

The network where the optical elements are located may be a structured network, as shown in FIGS. 12 to 16.

In the embodiments shown in FIGS. 12-15, the optical element is positioned along multiple concentric rings.

The concentric ring of optical elements may be an annular ring.

According to an embodiment of the present invention, the lens element further includes at least four optical elements. The at least four optical elements are organized into at least two sets of optical elements, each set of optical elements is organized into at least two concentric rings having the same center, and the concentric rings of each set of optical elements are defined by an inner diameter and an outer diameter.

According to an embodiment of the present invention, the optical elements in each set of optical elements are continuous.

The inner diameter of the concentric ring of each set of optical elements corresponds to the smallest circle tangent to at least one of the sets of optical elements. The outer diameter of the concentric ring of optical elements corresponds to the largest circle tangent to at least one optical element in the set.

指的是最靠近鏡片元件的光學中心的同心環的內徑，

指的是最靠近鏡片元件的光學中心的同心環的外徑，

指的是最靠近鏡片元件的周邊的環的內徑，並且

指的是最接近鏡片元件的周邊的「同心環」的外徑。For example, the lens element may include n optical element rings,

Refers to the inner diameter of the concentric ring closest to the optical center of the lens element,

Refers to the outer diameter of the concentric ring closest to the optical center of the lens element,

Refers to the inner diameter of the ring closest to the periphery of the lens element, and

Refers to the outer diameter of the "concentric ring" closest to the periphery of the lens element.

其中，

指的是第一光學元件環i的外徑並且

指的是第二光學元件環i + 1的內徑，其與第一光學元件環相連並且更靠近鏡片元件的周邊。The distance D _i between the concentric rings i and i + 1 of two consecutive optical elements can be expressed as:

among them,

Refers to the outer diameter of the first optical element ring i and

Refers to the inner diameter of the second optical element ring i+1, which is connected to the first optical element ring and is closer to the periphery of the lens element.

According to another embodiment of the present invention, the optical elements are organized as a concentric ring centered on the optical center of the surface of the lens element on which the optical elements are arranged and connected to the geometric center of each optical element.

指的是最靠近鏡片元件的光學中心的環的直徑，並且

指的是最靠近鏡片元件的周邊的環的直徑。For example, the lens element may include n optical element rings,

Refers to the diameter of the ring closest to the optical center of the lens element, and

Refers to the diameter of the ring closest to the periphery of the lens element.

其中，

指的是第一光學元件環i的直徑，並且

指的是第二光學元件環i + 1的直徑，其與第一光學元件環相連並且更靠近鏡片元件的周邊，並且 其中，

指的是在第一光學元件環上的光學元件的直徑，並且

指的是在第二光學元件環上的光學元件的直徑，第二光學元件環與第一環相連並且更靠近鏡片元件的周邊。光學元件的直徑對應於內接光學元件的外形形狀的圓的直徑。The distance D _i between the concentric rings i and i + 1 of two consecutive optical elements can be expressed as:

among them,

Refers to the diameter of the first optical element ring i, and

Refers to the diameter of the second optical element ring i + 1, which is connected to the first optical element ring and is closer to the periphery of the lens element, and wherein,

Refers to the diameter of the optical element on the first optical element ring, and

Refers to the diameter of the optical element on the second optical element ring, which is connected to the first ring and is closer to the periphery of the lens element. The diameter of the optical element corresponds to the diameter of the circle in which the external shape of the optical element is inscribed.

The concentric ring of optical elements may be an annular ring.

Advantageously, the optical center of the lens element coincides with the center of the concentric ring of optical elements. For example, the geometric center of the lens element, the optical center of the lens element, and the center of the concentric ring of the optical element coincide.

In the sense of the present invention, the term "coincidence" should be understood to be very close together, for example less than 1.0 mm apart.

The distance D _i between two consecutive concentric rings may vary according to i. For example, the distance D _i between two consecutive concentric rings can vary between 2.0 mm and 5.0 mm.

According to an embodiment of the invention, the distance D _i between the concentric rings of two consecutive optical elements is greater than 2.00 mm, preferably 3.0 mm, more preferably 5.0 mm.

Advantageously, having a distance D _i greater than 2.00 mm between two consecutive optical element concentric rings allows a larger refractive area to be managed between such optical element rings, thereby providing better visual acuity.

Considering that the annular area of the lens element has an inner diameter greater than 9 mm and an outer diameter less than 57 mm, the geometric center is located at a distance of less than 1 mm from the optical center of the lens element. The ratio between the total area and the area of the circular area is between 20% and 70%, preferably between 30% and 60%, and more preferably between 40% and 50%.

In other words, the inventors have observed that for a given value of the above ratio, the optical elements are organized into concentric rings, where the rings are separated by a distance greater than 2.0 mm, allowing the annular region providing the refractive area to be smaller than when the optical element is placed on the six sides The refraction areas managed in the shape network or randomly arranged on the surface of the lens element are easier to manufacture, thereby providing better correction of the eye's refractive error, and therefore better visual acuity.

According to an embodiment of the invention, the diameter di of all optical elements of the lens element is the same.

According to an embodiment of the invention, as i increases towards the periphery of the lens element, the distance D _i between two consecutive concentric rings i and i+1 can increase.

The optical element concentric ring may have a diameter between 9 mm and 60 mm.

According to an embodiment of the invention, the lens element comprises optical elements arranged in at least 2 concentric rings, preferably more than 5, more preferably more than 10 concentric rings. For example, the optical element may be arranged as 11 concentric rings centered on the optical center of the lens.

In Figure 12, the optical element is a microlens positioned along a set of 5 concentric rings. The power of the microlenses and/or the lenticular lenses can be different depending on their position along the concentric rings.

In Fig. 13, the optical elements correspond to different magnetic regions of concentric circles.

In Fig. 14b, the optical element corresponds to a part of a pure cylindrical concentric ring, as shown in Fig. 14a. In this example, the optical element has a constant power but has a variable cylinder axis position.

According to an embodiment of the present invention, for example as shown in FIG. 12, the lens element may further include an optical element 14 positioned radially between two concentric rings. In the example shown in FIG. 12, only four optical elements are placed between two concentric rings, however, more optical elements can be placed between the two rings.

The optical elements can be placed on a structured network, which is a square network or a hexagonal network or a triangular network or an octagonal network.

This embodiment of the invention is shown in FIG. 16, where the optical element 14 is placed on a square network.

Alternatively, the optical elements can be placed on a random structure network, such as a Voronoid network, as shown in FIG. 17.

Advantageously, placing the optical elements on a random structure limits the risk of light scattering or diffraction.

Different connections between two consecutive optical elements are possible.

For example, as shown in FIGS. 18a and 18b, at least a part, for example, all of the optical elements have a constant power and a discontinuous first derivative between two consecutive optical elements. In the examples shown in FIGS. 18a and 18b, the angle coordinates in the reference of the polar coordinates of the teta series. As can be observed in this embodiment, there is no area between successive optical elements without spherical mirrors.

Alternatively, as shown in FIGS. 19a and 19b, at least a part, for example, all of the optical elements have varying power and continuous first-order derivatives between two consecutive optical elements.

In order to obtain this change, two constant powers can be used here, one for positive and one for negative. The area of negative power is much smaller than the area of positive power, so the overall power has a positive power effect.

An important point in this embodiment shown in FIGS. 19a and 19b is that the Z coordinate is always positive compared to the refractive area.

As shown in FIG. 2, the lens element 10 according to the present invention includes an object-side surface F1 formed as a convex curved surface toward the object side, and an eye-side surface F2 formed as a concave surface having a curvature different from that of the object-side surface F1 .

According to an embodiment of the invention, at least a part, for example all of the optical elements are located on the front surface of the lens element.

At least a part, for example, all optical elements may be located on the rear surface of the lens element.

At least a part, for example, all the optical elements may be located between the front surface and the rear surface of the lens element. For example, the lens element may include regions with different refractive indices that form the optical element.

According to an embodiment of the present invention, at least one optical element has an optical function of focusing an image on a position other than the retina for peripheral vision.

Preferably, at least 50%, for example at least 80%, for example all optical elements have an optical function of focusing the image on a position other than the retina for peripheral vision.

According to a preferred embodiment of the present invention, at least for peripheral vision, all optical elements are configured such that the average focus of the light passing through each optical element is at the same distance from the wearer's retina.

The optical function of each optical element, especially the refractive function, can be optimized to provide a focus image at a constant distance from the retina of the wearer's eye, especially under peripheral vision. This optimization requires adjusting the refractive function of each optical element according to the position of the optical element on the lens element.

In particular, the inventors have determined that the dot pattern of the light beam passing through the spherical 3D-shaped microlenses analyzed under peripheral vision (30° from the pupil center) is not a point.

To obtain a point, the inventor has determined that the optical element should have a cylindrical power, for example, having a toric shape.

The type of astigmatism commonly encountered as a visual defect is caused by different lens curvatures in different planes. But even spherical lenses that are completely symmetrical exhibit a kind of light astigmatism, and the light approaches the lens from a point outside the optical axis. As shown in Fig. 10b, oblique axis astigmatism is an aberration of off-axis light rays, which causes radial lines and tangents in the object plane to be clearly focused at different distances in the image space.

Therefore, viewing the spherical lens along its optical axis does not produce astigmatism. If the optical element is seen such that the axis of the optical element passes through the eye, especially through the center of the pupil for peripheral vision, there is no astigmatism. However, in all other cases, even when the optical element is eccentric compared to the gaze direction, especially for peripheral vision, people have oblique astigmatism. The light passing through the optical element "sees" the same power on all meridians, that is, from the center to the edge of the optical element.

According to an embodiment of the present invention, the optical element is configured such that along at least one section of the lens, the average spherical mirror of the optical element increases from a certain point of the section toward the periphery of the section.

The optical element may be further configured such that at least one section along the lens, for example at least the same section as the section along which the average spherical mirror increase of the optical element, the lenticular lens from a certain of the sections The point (for example, the same point as the average spherical mirror) increases toward the peripheral portion of the section.

Advantageously, the optical element is arranged along at least one section of the lens, and the average spherical mirror and/or average cylindrical lens of the optical element increases from the point of the section towards the peripheral portion of the section, allowing near vision Increase the defocus of the light in front of the retina in the case, or increase the defocus of the light behind the retina in the case of hyperopia.

In other words, the inventors have observed that the optical element is configured so that along at least one section of the lens, the average spherical mirror of the optical element increases from the point of the section toward the peripheral portion of the section, contributing to Slow down the development of eye refractive errors such as myopia or hyperopia.

The optical element may be configured such that along at least one section of the lens, the average spherical mirror and/or lenticular lens of the optical element increases from the center of the section toward the peripheral portion of the section.

According to an embodiment of the invention, the optical element is configured such that under standard wearing conditions, at least one section is a horizontal section.

The average spherical mirror and/or cylindrical lens may increase along at least one horizontal section according to an increase function, which is a Gaussian function. The Gaussian function can be different between the nose and the temporal portion of the lens in order to take into account the asymmetry of the human retina.

Alternatively, the average spherical mirror and/or cylindrical lens may increase along at least one horizontal section according to an increase function, which is a quadratic function. The quadratic function may be different between the nose and the temporal portion of the lens in order to take into account the asymmetry of the human retina.

According to an embodiment of the present invention, the average spherical mirror and/or cylindrical lens of the optical element increases from the first point of the section toward the peripheral portion of the section, and from the second point of the section toward the The peripheral portion of the section decreases, and the second point is closer to the peripheral portion of the section than the first point.

Such an embodiment is shown in Table 1, which provides the average spherical mirror of the optical element according to their radial distance from the optical center of the lens element.

[表1]In the example of Table 1, the optical element is a microlens placed on the front surface of a sphere with a curvature of 329.5 mm, and the lens element is made of an optical material with a refractive index of 1.591, and the prescription power of the wearer is 6 D. The optical element should be worn under standard wearing conditions, and the wearer's retina is considered to have a defocus of 0.8 D at an angle of 30°. Make sure that the optical element has a 2D peripheral defocus.

[Table 1]

As shown in Table 1, starting from close to the optical center of the lens element, the average spherical mirror of the optical element increases toward the peripheral portion of the section, and then decreases toward the peripheral portion of the section.

According to an embodiment of the present invention, the average lenticular lens of the optical element increases from the first point of the section toward the peripheral portion of the section, and from the second point of the section toward the periphery of the section Partially reduced, the second point is closer to the peripheral portion of the section than the first point.

Such an embodiment is shown in Tables 2 and 3, which provides the magnitude of the lenticular vector projected in the first direction Y corresponding to the local radial direction and the second direction X orthogonal to the first direction.

In the example of Table 2, the optical element is a microlens placed on the front surface of a sphere with a curvature of 167.81 mm, and the lens element is made of a material with a refractive index of 1.591, the prescription power of the wearer is- 6 D. The lens element should be worn under standard wearing conditions, and the wearer's retina is considered to have a defocus of 0.8 D at an angle of 30°. Make sure the optics provide 2 D of peripheral defocus.

[表2]

[表3]In the example of Table 3, the optical element is a microlens placed on the front surface of the sphere with a curvature of 167.81 mm, and the lens element is made of a material with a refractive index of 1.591, the prescription power of the wearer is- 1 D. The lens element should be worn under standard wearing conditions, and the wearer's retina is considered to have a defocus of 0.8 D _i at an angle of 30°. Make sure the optics provide 2 D of peripheral defocus.

[Table 2]

[table 3]

As shown in Tables 2 and 3, starting near the optical center of the lens element, the lenticular of the optical element increases toward the peripheral portion of the section, and then decreases toward the peripheral portion of the section.

According to an embodiment of the present invention, the prescription portion includes an optical center, and the optical element is configured such that along any section passing through the optical center of the lens, the average spherical and/or cylindrical lens of the optical element is directed from the optical element toward the lens The peripheral part is enlarged.

For example, the optical elements may be regularly distributed along a circle centered on the optical center of the part.

The optical element on a circle having a diameter of 10 mm and centered on the optical center of the prescription portion may be a microlens with an average spherical mirror of 2.75 D.

The optical element on a circle having a diameter of 20 mm and centered on the optical center of the prescription portion may be a microlens having an average spherical mirror of 4.75 D.

The optical element on a circle having a diameter of 30 mm and centered on the optical center of the prescription portion may be a microlens with an average spherical mirror of 5.5 D.

The optical element on a circle having a diameter of 40 mm and centered on the optical center of the prescription portion may be a microlens with an average spherical mirror of 5.75 D.

The cylinders of different microlenses can be adjusted based on the shape of the human retina.

According to an embodiment of the present invention, the prescription portion includes a farsighted reference point, a nearsighted reference point, and a meridian connecting the farsighted reference point and the nearsighted reference point. For example, the prescription section may include a gradient multifocal lens design that is suitable for human prescriptions or for slowing the development of refractive errors in the eyes of people wearing lens elements.

Preferably, according to such an embodiment, the optical element is configured such that under standard wearing conditions, along any horizontal section of the lens, the average spherical and/or cylindrical lens of the optical element The intersection of the meridians increases toward the peripheral portion of the lens.

This meridian corresponds to the locus of the intersection of the main gaze direction and the lens surface.

The average spherical mirror and/or average lenticular increase function along these sections may vary according to the position of the section along the meridian.

In particular, the average sphere mirror and/or average cylinder increase function along these sections is asymmetric. For example, under standard wearing conditions, the average sphere and/or average cylinder increase function is asymmetric along the vertical and/or horizontal sections.

According to an embodiment of the present invention, under standard wearing conditions and for peripheral vision, at least one of the optical elements has an unfocused optical function.

Preferably, under standard wearing conditions and for peripheral vision, at least 50%, for example at least 80%, for example all optical elements 14 have an unfocused optical function.

In the sense of the present invention, "unfocused optical function" should be understood as not having a single focal point for peripheral vision under standard wearing conditions.

Alternatively, this optical function of the optical element reduces the deformation of the retina of the wearer's eye, allowing to slow the development of refractive errors in the eye of the person wearing the lens element.

At least one element with a non-focusing optical function is transparent. Advantageously, the discontinuous optical element is not visible on the lens element and does not affect the aesthetic appearance of the lens element.

According to an embodiment of the present invention, the lens element may include an ophthalmic lens carrying a prescription portion and a clip carrying a plurality of at least three optical elements, the optical elements being adapted to be removably attached to the ophthalmology when the lens element is worn lens.

Advantageously, when the person is in a remote environment, such as outdoors, the person can separate the clip from the ophthalmic lens and eventually replace the second clip without any of the at least three optical elements. For example, the second clip may include a sunscreen shade. People can also use ophthalmic lenses without any additional clips.

Optical elements can be added independently to the lens element, to each surface of the lens element.

These optical elements can be added to a defined array, such as square or hexagonal or random or otherwise.

The optical element may cover a specific area of the lens element, such as in the center or any other area.

The optical element density or focal metric can be adjusted according to the area of the lens element. Generally, the optical element can be positioned at the periphery of the lens element to increase the influence of the optical element on myopia control, thereby compensating for peripheral defocusing caused by, for example, the peripheral shape of the retina.

According to a preferred embodiment of the present invention, each circular area having a radius comprised between 2 mm and 4 mm includes a geometric center located at a distance from the optical center of the optical element, the distance being greater than or equal to the radius + 5 mm, the ratio between the sum of the areas of the optical elements located in the circular area and the area of the circular area is between 20% and 70%, preferably between 30% and 60% Between, and more preferably between 40% and 50%.

Optical components can be manufactured using different techniques, such as direct surface treatment, molding, casting or injection molding, embossing, film formation, or photolithography...

According to an embodiment of the invention, the shape of at least one, for example all optical elements, is configured to form a caustic point in front of the retina of the human eye. In other words, such an optical element is configured such that each segment plane (if any) where the luminous flux is concentrated is located in front of the retina of the human eye.

According to an embodiment of the present invention, at least one, for example, all optical elements with aspherical optical functions are multifocal refractive microlenses.

In the sense of the present invention, the optical element is a "multifocal refractive microlens", including bifocal (with two powers), trifocal (with three powers), progressive multifocal lens, with continuously changing power, For example, aspherical gradient surface lenses.

In the sense of the present invention, a "microlens" has an external shape that can be inscribed in a circle with a diameter greater than or equal to 0.8 mm and less than or equal to 3.0 mm, preferably greater than or equal to 1.0 mm and less than 2.0 mm.

According to an embodiment of the present invention, at least one of the optical elements, preferably more than 50%, more preferably more than 80% of the optical elements are aspherical microlenses. In the sense of the present invention, aspherical microlenses have a continuous power evolution on their surface.

Aspheric microlenses may have asphericity between 0.1 D and 3 D. The asphericity of an aspherical microlens corresponds to the ratio of the power measured at the center of the microlens to the power measured at the periphery of the microlens.

The center of the microlens can be defined by a spherical area centered on the geometric center of the microlens and having a diameter between 0.1 mm and 0.5 mm, preferably equal to 2.0 mm.

The periphery of the microlens can be defined by an annular region centered on the geometric center of the microlens and having an inner diameter between 0.5 mm and 0.7 mm and an outer diameter between 0.70 mm and 0.80 mm.

According to an embodiment of the present invention, the absolute value of the power of the aspherical microlens at its geometric center is between 2.0 D and 7.0 D, and the absolute value of the power at its periphery is between 1.5 D and 6.0 D .

Before coating the surface of the lens element on which the optical element is provided, the asphericity of the aspherical microlens may vary according to the radial distance from the optical center of the lens element.

In addition, after coating the surface of the lens element on which the optical element is provided, the asphericity of the aspherical microlens may further vary according to the radial distance from the optical center of the lens element.

According to an embodiment of the present invention, at least one multifocal refractive microlens has a toric surface. A toric surface is a rotating surface that can be produced by rotating a circle or arc around an axis of rotation (finally positioned at infinity) that does not pass through its center of curvature.

Toric lenses have two different radial profiles at right angles to each other, thus producing two different powers.

The toric and spherical components of toric lenses produce astigmatic light beams instead of a single point of focus.

According to an embodiment of the present invention, at least one, for example, all optical elements with aspherical optical functions are toric refractive micro lenses. For example, a toric refractive microlens with a spherical power value greater than or equal to 0 diopters (δ) and less than or equal to +5 diopters (δ) and a cylindrical power value greater than or equal to 0.25 diopters (δ).

The tilt effect of the peripheral light passing through the spherical micro-lens produces oblique axis astigmatism, thereby generating an unfocused light beam.

Advantageously, having a toric microlens allows the light passing through the microlens to be focused at a given distance from the wearer's retina.

As a specific embodiment, the toric refractive microlens may be a pure cylindrical lens, meaning that the minimum power of the meridian is zero, and the maximum power of the meridian is strictly positive, for example, less than 5 diopters.

According to an embodiment of the invention, at least one, for example all optical elements are made of birefringent material. In other words, the optical element is made of a material having a refractive index that depends on the polarization and propagation direction of light. Birefringence can be quantified as the largest difference between the refractive indices exhibited by the material.

According to an embodiment of the invention, at least one, for example all of the optical elements have a discontinuity, such as a discontinuous surface, such as a Fresnel surface and/or have a discontinuous refractive index profile.

Fig. 3 shows an example of the Fresnel mirror height profile that can be used for the optical element of the present invention.

According to an embodiment of the invention, at least one, for example all optical elements are made of diffractive lenses.

Fig. 4 shows an example of the radial profile of a diffractive lens that can be used in the optical element of the present invention.

At least one, for example, all diffractive lenses may include a metasurface structure as disclosed in WO2017/176921.

The diffractive lens may be a Fresnel lens whose phase function ψ(r) has a π phase jump at the nominal wavelength, as seen in FIG. 5. For the sake of clarity, these structures can be named "π-Fresnel lenses" because they are the opposite of single-focus Fresnel lenses with multiple values of phase transition 2π. The π-Fresnel lens whose phase function is shown in FIG. 5 mainly diffracts light in two diffraction orders related to a refractive power of 0δ and a positive refractive power P, for example, 3δ.

According to an embodiment of the invention, at least one, for example, all optical elements are multifocal binary components.

For example, as shown in Fig. 6a, the binary structure mainly shows two diopters, denoted as -P/2 and P/2. When associated with a refractive structure as shown in Fig. 6b, the diopter is P/2, and the final structure represented in Fig. 6c has diopters 0δ and P. The situation shown is related to P = 3δ.

According to an embodiment of the invention, at least one, for example, all optical elements are patterned lenses. Examples of multifocal primitive lenses are disclosed in "APPLIED OPTICS [Applied Optics], Vol. 44, No. 14, May 10, 2005" by Eyal Ben-Eliezer et al.

According to an embodiment of the present invention, at least one, for example, all optical elements have an optical function with higher-order optical aberrations. For example, the optical element is a microlens composed of a continuous surface defined by Rennick polynomial.

According to an embodiment of the invention, at least one, for example at least 70%, for example all optical elements are active optical elements, which can be activated manually or automatically by an optical lens controller device.

The active optical element may comprise a material with a variable refractive index, the value of the refractive index being controlled by the optical lens controller device.

The invention also relates to a method for determining a lens element suitable for slowing the development of the refractive error of the wearer's eye.

As shown in FIG. 11, the method of the present invention includes at least: -Step S1 for providing prescription data of the wearer, -Step S2 for providing wearing condition data, -Step S3 of wearing the retina data of the wearer, and -Step S4 for determining the lens element,

During the wearer prescription data providing step S1, wearer prescription data related to the wearer's prescription is provided.

During the wearer condition data providing step S2, wear condition data related to the condition of the wearer wearing the lens element is provided.

According to an embodiment of the present invention, the wearing condition data provided during the wearing condition data providing step corresponds to the standard wearing condition.

Alternatively, the wearing condition data provided during the wearing condition data providing step corresponds to wearing conditions measured on the wearer or customized based on, for example, morphology or posture data related to the wearer.

During the step S3 of providing the wearer's retinal data, retinal data related to the shape of the wearer's retina in the same reference frame as the wearing conditions is provided.

According to an embodiment of the present invention, the wearer's retina data provided during the wearer's retina data providing step corresponds to a standard retina shape.

Examples of standard retinal shapes are in Mutti DO1, Hayes JR, Mitchell GL, Jones LA, Moeschberger ML, Cotter SA, Kleinstein RN, Manny RE, Twelker JD, Zadnik K, ``Refractive error, axial length, and relative peripheral refractive error before and after the onset of myopia [refractive error, axial length, and relative peripheral refractive error before and after onset of myopia]" was disclosed; CLEERE research group, Invest Ophthalmol Vis Sci. June 2007; 48(6): 2510 -9.

Other examples of standard retinal shapes are disclosed in "Peripheral refraction along the horizontal and vertical visual fields in myopia [Peripheral refraction along the horizontal and vertical visual fields in myopia]" by Atchison DA1, Pritchard N, Schmid KL, Vision Res. April 2006; 46(8-9): 1450-8.

Other examples of standard retinal shapes are in Donald O. Mutti, Robert I. Sholtz, Nina E. Friedman and Karla Zadnik, IOVS, April 2000, Volume 41, Issue 5, "Peripheral Refraction and Ocular Shape in Children [Children Peripheral refraction and eye shape]".

Alternatively, the wearer's retina data provided during the wearer's retina data providing step may correspond to the shape of the retina measured on the wearer or customized, for example, based on the wearer's morphology or prescription.

During the lens element determination step S4, a lens element including a prescription portion and a plurality of at least three optical elements is determined.

The lens element is determined so that the prescription part provides the first optical power based on the wearer's prescription for foveal vision under the wearing conditions corresponding to the wearing data and for the fovea vision.

In addition, it is determined that at least one optical element, such as at least 50%, preferably at least 80%, must have an optical function that does not focus the image on the retina of the eye for peripheral vision.

Advantageously, the determined lens element is provided for foveal vision correction corresponding to the wearer's prescription, and for.

According to an embodiment of the invention, during the lens element determination step, at least 50%, for example at least 80% of the optical elements are determined in order to focus the image at a given distance from the retina. The distance is defined for each optical element along an axis connecting the reference point of the optical element (eg, the optical center of the lens element) and the wearer's pupil center.

Alternatively, at least 50%, for example at least 80% of the optical elements are determined so as to focus the image at the same distance of the retina along the axis connecting the reference point of each optical element and the wearer's pupil center.

As shown in FIG. 11, the method of the present invention may further include a front surface data providing step S40.

During the front surface data providing step S40, front surface data representing the front surface of the lens element is provided.

According to such an embodiment, during the lens element determination step, the shape of the rear surface and the optical element to be placed on the front surface are determined so that the prescription portion is under the wearing conditions corresponding to the wearing data and for the concave vision The first optical power is provided based on the prescription of the wearer, and at least one optical element has an optical function of not focusing the image on the retina of the eye for peripheral vision.

According to a preferred embodiment, during the lens element determination step, the shape of the rear surface is determined so that the prescription part provides the first under the wearing conditions corresponding to the wearing data and for the foveal vision based on the wearer's prescription Optical power.

The optical element is determined so as to be placed on the front or back surface of the previously determined lens, and the image is focused at a given distance of the retina of the eye for peripheral vision.

As can be seen, the optical element itself can be optimized, but the opposite lens surface can also be optimized, or a combination of the two, to reduce the aberration of the optical element for peripheral vision. In this case, it will be a compromise between the prescription part and the optimization of the optical components. This is especially relevant when mass production of optical components (molds, films embedded in lenses).

The invention has been described above with the aid of embodiments, without limiting the general inventive concept.

When referring to the foregoing illustrative embodiments, many further modifications and changes will be apparent to those skilled in the art. These embodiments are given by way of example only and are not intended to limit the scope of the invention. It is determined only by the scope of the attached patent application.

In the scope of patent application, the word "include" does not exclude other elements or steps, and the indefinite article "a (a) or (an)" does not exclude plurals. The mere fact that different features are described in mutually different dependent patent applications does not mean that a combination of these features cannot be used to advantage. Any reference signs in the scope of the patent application should not be construed as limiting the scope of the invention.

10‧‧‧Lens element 12‧‧‧ Prescription 14‧‧‧Optical components 16‧‧‧ Central area F1‧‧‧Object side surface F2‧‧‧eye side surface F'‧‧‧point J‧‧‧point M‧‧‧point O‧‧‧point Q1‧‧‧ quadrant Q2‧‧‧quadrant Q3‧‧‧quadrant Q4‧‧‧ quadrant Q'‧‧‧ Center q'‧‧‧ radius S‧‧‧ points S1‧‧‧Procedures for providing prescription data for wearers S2‧‧‧Procedures for wearing condition data S3‧‧‧Procedures to provide wearer's retina data S4‧‧‧ Lens element determination steps S40‧‧‧Front surface data provision steps T‧‧‧point x‧‧‧Second direction y‧‧‧first direction z‧‧‧ direction α‧‧‧parameter/angle β‧‧‧parameter/angle

Non-limiting embodiments of the present invention will now be described with reference to the drawings, in which: [FIG. 1] is a plan view of a lens element according to the present invention; o [FIG. 2] is a lens element according to the present invention Overall profile view; o [Figure 3] shows an example of the Fresnel lens height profile; o [Figure 4] shows an example of the radial profile of the diffractive lens; o [Figure 5] shows the profile of the π-Fresnel lens; o [ Figures 6a to 6c] show the embodiment of the binary lens of the present invention; o [Figure 7a] shows the astigmatic axis γ of the lens in TABO convention; o [Figure 7b] shows the characterization of the aspherical surface The axis position of the cylindrical lens γ _AX in the convention; o [Figure 8 to 10a] graphically shows the optical system of the eye and the lens; o [Figure 10b] shows the oblique axis astigmatism; o [Figure 11] is based on Flow chart of the method of the present invention. o [FIG. 12] is a plan view of a lens element according to an embodiment of the present invention; o [FIG. 13 to FIG. 17] shows different organizations of optical elements according to different embodiments of the present invention; and [FIG. 18a to FIG. 19b] shows different types of bonding between optical elements according to the invention. The elements in the drawings are shown for simplicity and clarity and are not necessarily drawn to scale. For example, the dimensions of some elements in the figures may be enlarged relative to other elements to help improve the understanding of the embodiments of the present invention.

10‧‧‧Lens element

12‧‧‧ Prescription

14‧‧‧Optical components

16‧‧‧ Central area

Q1‧‧‧ quadrant

Q2‧‧‧quadrant

Q3‧‧‧quadrant

Q4‧‧‧ quadrant

Claims (15)

A lens element intended to be worn in front of an eye of a wearer, the lens element comprising: A prescription part configured for correcting a refractive error of the eye of the wearer based on the wearer's prescription under standard wearing conditions and for the foveal vision to the wearer Provide a first optical power; A plurality of at least three optical elements, at least one optical element having an optical function under standard wearing conditions and not focusing an image on the retina of the eye for peripheral vision, so as to slow down the development of the refractive error of the eye . The lens element according to claim 1, wherein at least one, for example, all of the optical elements have an optical function under standard wearing conditions and focusing an image on a position other than the retina for peripheral vision. The lens element according to claim 1 or 2, wherein at least one optical element has a non-focusing optical function for peripheral vision under standard wearing conditions. The lens element according to claim 1 or 2, wherein at least one of the optical elements has a cylindrical power. The lens element according to claim 1 or 2, wherein the optical elements are configured such that along at least one section of the lens, the average spherical mirror of the optical element increases from a point of the section toward the peripheral portion of the section Big. The lens element according to claim 1 or 2, wherein the optical elements are configured such that: in at least one section along the lens, the cylindrical lens of the optical element is directed from a point of the section toward the peripheral portion of the section Increase. The lens element according to claim 1 or 2, wherein the optical elements are configured such that along the at least one section of the lens, the average spherical mirror and/or cylindrical lens of the optical element is directed from the center of the section toward the The peripheral portion of the section increases. The lens element of claim 1 or 2, wherein the prescription portion includes an optical center, and the optical elements are configured such that along any section passing through the optical center of the lens, the average of the optical elements The spherical lens and/or cylindrical lens increases from the optical center toward the peripheral portion of the lens. The lens element according to claim 1 or 2, wherein the prescription part is formed as a part other than the part formed as the plurality of optical elements. The lens element according to claim 1 or 2, wherein, for each circular area with a radius comprised between 2 mm and 4 mm, the distance from the pupil facing the user who is looking straight ahead under standard wearing conditions is included The reference frame is a geometric center at a distance greater than or equal to the radius + 5 mm, and the ratio between the sum of the areas of the optical element parts located in the circular area and the area of the circular area is comprised between 20% and 70 %between. The lens element according to claim 1 or 2, wherein the at least three optical elements are discontinuous. The lens element according to claim 1 or 2, wherein at least a part, for example, all of the optical elements are located on the front surface of the ophthalmic lens. A method for determining a lens element suitable for slowing the development of refractive errors in a wearer's eye, the method comprising: A step of providing prescription data of the wearer, during this step, providing prescription data of the wearer related to the prescription of the wearer, A wearing condition data providing step, during this step, the wearing condition data related to the wearing condition of the lens element by the wearer, A step of providing the wearer's retina data, during this step, the wearer's retina data related to the shape of the wearer's retina, A lens element determination step, during which a lens element including a prescription portion and a plurality of at least three optical elements is determined so that the prescription portion is under the wearing conditions corresponding to the wearing data and directed to the center Concave vision provides a first optical power based on the wearer's prescription, and at least one optical element has an optical function that does not focus an image on the retina of the eye for peripheral vision. The method of claim 13, wherein during the lens element determination step, at least 50%, such as at least 80% of the optical elements are determined so as to focus an image at a given distance from the retina. The method according to any one of claims 13 or 14, wherein the method further comprises a front surface data providing step, during which step, front surface data representing the front surface of the lens element is provided, and wherein, in the During the lens element determination step, the shape of the rear surface and the optical elements to be placed on the front surface are determined so that the prescription part is under the wearing conditions corresponding to the wearing data and based on the foveal vision The wearer's prescription provides a first optical power, and at least one optical element has an optical function that does not focus an image on the retina of the eye for peripheral vision.

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