JPH0572574A - Spectacle lens for ophthalmic patient - Google Patents

Abstract

PURPOSE:To save the labor for an ophthalmic patient wearing special spectacles to place sunglasses further on the spectacles when the patient moves out of, for example, a dark room to outdoors under the strong sun shine. CONSTITUTION:The ophthalmic patient of, for example, cataract, wears the special spectacles fitted with plastic lenses which are dyed with chromatic dyes and absorb a part of visible light an UV rays. At least a pair of transparent electrode layers and transmission type electrochromic elements 3 consisting of electrochromic layers held therebetween are formed on the surfaces of such lenses 1. The transmittance of light can be changed by connecting a power source to the elements and turning on and off the power source. This lens is effective for preventing 1R hazards as well.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to improvements in eyeglass lenses for ophthalmic patients.

[0002]

2. Description of the Related Art For patients with retinitis pigmentosa, exposing the eyes to natural light should be avoided as it promotes lesion progression. Therefore, Totsuka et al. (Kiyo Totsuka, Hidetaka Takayama, Ko Yano) “Introduction of eyeglass lenses manufactured for the purpose of delaying the progression of retinitis pigmentosa” (1st report)
6) p1180 to 1181 (1982) A spectacle lens that blocks wavelengths that are easily absorbed by rhodopsin and transmits wavelengths that are easily absorbed by cones is recommended. Therefore, eyeglass lenses for ophthalmic patients that absorb a part of visible light (wavelength: 470 nm or less, preferably 550 nm or less) and ultraviolet rays have already been developed and put on the market. This type of lens is a plastic lens dyed with an organic dye, and the dye is also commercially available from BPI, USA under the trade names of Diamonddye 500/550 and 540, and Mitsui Toatsu Co., Ltd. under the trade name of Miketon Poly-ester Yellow 5R. Has been done.

[0003]

For retinitis pigmentosa patients, not only the wavelength but also the intensity of light is a problem, and strong sunlight is extremely dazzling. Therefore, even if the patient wears special spectacles having spectacle lenses for an ophthalmologic patient, there is a problem that he or she wants more sunglasses. However, wearing double glasses is painful for the patient, and
There was a problem that when I entered the room, I had to remove my sunglasses and then I couldn't see well because it was dark.

Further, conventional eyeglass lenses for ophthalmic patients are
Infrared rays that transmit infrared rays and accumulate,
There was a second problem that it caused the lens and retina. An object of the present invention is to solve these problems.

[0005]

Therefore, the present invention provides a spectacle lens for an ophthalmic patient, which is dyed with an organic dye and therefore comprises a plastic lens that absorbs a part of visible light and ultraviolet rays. A spectacle lens provided with a surface "a transmission type electrochromic element (hereinafter, this element is simply referred to as ECD) including at least a pair of transparent electrode layers and an electrochromic layer sandwiched therebetween".

[0006]

The lens substrate is limited to plastic because it needs to be dyed. As for the type of plastic,
For example, acrylic resin, polycarbonate, polyester, silicone resin, polysiloxane, cellulose acetate, cellulose propionate, cellulose butyrate, polyvinyl chloride, polystyrene, polyamide, polyurethane, diethylene glycol bisallyl carbonate (that is, polymer of CR-39). Transparent polymer materials such as However, in order to form the ECD, a lens base material made of glass is preferable in terms of heat resistance.

Therefore, the lens substrate may be composed of two or more laminated lenses (bonded). The lens substrate may be prescription, and in the case of a laminated lens, all the lenses may be prescription or only one lens may be prescription. When only one lens has a degree, a plastic lens may have a degree, and conversely, a glass lens may have a degree. In the case of prescription, the prescription may be provided in advance at the stage of the lens substrate, or conversely, the pretreatment may be performed after the lens of the present invention is completed.

In any case, when a lens substrate having a plastic portion is prepared, it is dyed with a predetermined organic dye. As the dye, the above-mentioned dye and others are used. On the other hand, ECD is generally in the form of a thin plate (planar),
Here, the transmissive type is used. A thin film type ECD is preferable because it is thin, and examples of the structure thereof include a four-layer structure such as electrode layer / EC layer / ion conductive layer / electrode layer, electrode layer / reduction coloring type EC layer / ion conductive layer / A five-layer structure such as a reversible electrolytic oxidation layer or an oxidation coloring type EC layer / electrode layer can be mentioned. In this case, both electrode layers must be transparent. EC is an abbreviation for electrochromic.

The material of the transparent electrode is, for example, Sn.
O ₂ , In ₂ O ₃ , ITO or the like is used. Such an electrode layer is generally formed by a vacuum thin film forming technique such as vacuum deposition, ion plating or sputtering. (Reducing colorability) The EC layer is generally WO ₃ , Mo.
O ₃ or the like is used. As the ion conductive layer, for example, silicon oxide, tantalum oxide, titanium oxide, aluminum oxide, niobium oxide, zirconium oxide, hafnium oxide, lanthanum oxide, magnesium fluoride or the like is used. Although these material thin films require some ingenuity in the manufacturing method, they are insulators against electrons, but they are proton (H ⁺ )
And, a good conductor is obtained for hydroxy ion (OH ⁻ ). This is called an ion conductive layer. E
A cation is required for the color erasing reaction of the C layer, and H ⁺ ions and Li ⁺ ions must be contained in the EC layer and the like. The H ⁺ ion does not have to be an ion from the beginning,
It suffices that H ⁺ ions are generated when a voltage is applied, and thus water may be contained instead of the H ⁺ ions. This water is very small and sufficient, and often even water that naturally infiltrates from the atmosphere fades.

Either the EC layer or the ionic conductive layer may be on either side. Further, a reversible electrolytic oxidation layer, or an oxidation coloring type EC layer or a catalyst layer may be disposed with respect to the EC layer with an ion conductive layer interposed therebetween. Examples of such a layer include iridium oxide or hydroxide, nickel, chromium, vanadium, ruthenium, rhodium and the like. These substances may be dispersed in the ionic conductive layer or the transparent electrode, or may be contained by dispersing their constituent substances.

The ECD may be formed on either the front surface or the rear surface of the lens substrate, or in the case of a laminated lens, it may be arranged in the middle.

[0012]

[Example 1] First, as a lens substrate, three pieces of trade name: NL70H (without degree) commercially available from Nikon Corporation were prepared. Separately, (a) Diamonddye 500/550 was weighed in 12 ounces (340.2 g) and dissolved in hot water at 60 ° C. to prepare 1 liter of dyeing solution. Similarly (b) Diam
Ond dye 450 dyeing solution, (c) Miketon PolyesterYel
A staining solution of low 5R was prepared.

All the dyeing solutions were heated to 92 ° C. and the lens substrate was dipped therein. 40 minutes for the staining solution in (a),
After immersion in the staining solution of (b) for 10 minutes and in the staining solution of (c) for 13 minutes, the lens substrate is taken out, washed with water, and dried to obtain (a) orange, (b) brown, (c) ) A yellow dyed lens was obtained. Since the visible light transmittance of the obtained lens substrate was measured, (a) orange is shown in FIG. 5, (b) brown is shown in FIG. 6, and (c) yellow is shown in FIG.
Shows the transmittance spectrum.

Next, a thin film type ECD is formed on the surface of these lens substrates. The structure of the ECD is a five-layer structure as shown in FIG.
Transparent electrode layer (35), oxidation coloring type EC layer (3) having a thickness of 1500 Å and made of a mixture of iridium oxide and tin oxide
4), a transparent ion conductive layer (33) made of Ta ₂ O _{5 having} a thickness of 7500Å, a reduction coloring type EC layer (32) made of WO ₃ having a thickness of 5500Å, and an ITO transparent electrode layer (31) having a thickness of 2000Å Consists of.

In this ECD, when a coloring voltage (DC) of about 1.4 V is applied between the electrodes (31) and (35) at 25 ° C., the EC element is colored blue, and after 7 seconds, it is transmitted. Rate T
c has a performance of reducing to 13% at the wavelength λ = 600 nm,
After coloring, when a decoloring voltage (DC) of about -1.4 V is applied between the electrodes (31) and (35), the EC element is decolored,
It has the ability to recover the original transmittance Tb = 68% (λ = 600 nm) in 3 seconds. The transmittance (UV spectrum) in the ultraviolet-visible light-infrared region was measured when only ECD was colored and when it was decolored, and the data (spectrum) is shown in FIG.

FIG. 1 (conceptual diagram) shows a cross section of the spectacle lens of this example obtained by forming an ECD on a dyed lens substrate. Further, the transmittance of the spectacle lens of this example was measured, and therefore (a) orange is shown in FIG.
Brown shows the transmittance spectrum in FIG. 10, and (c) yellow shows the transmittance spectrum in FIG. 11. Both of them are shown both when the ECD is colored (at the time of maximum coloring) and at the time of erasing (at the time of maximum erasing).

Further, when the luminous transmittance (light source: D65) of each lens was measured, (a) orange was 50.
%, (B) brown was 30%, and (c) yellow was 88%.

[0018]

[Embodiment 2] Here, Embodiment 1 (FIG. 1) is used for protection.
A glass lens (5) is bonded to the lens surface of (1) via an adhesive (4), and the cross-sectional structure is shown in FIG.

[0019]

[Embodiment 3] Here, as shown in FIG. 4, the ECD of Embodiment 1 was formed on a glass lens (2), and the ECD of the ECD was applied to the glass lens (2) through an adhesive (4). (Example 1
Used in the above) = a conventional eyeglass lens for ophthalmic patients. A hard polysiloxane-based hard coat film is applied (formed) to the surface of the lens substrate.

[0020]

According to the present invention, when the user is in the strong sunshine, he / she can simply use the EC without wearing double sunglasses.
By putting the electric switch of D in the coloring direction to make it colored, it will not be dazzling, and conversely, when entering the room,
By simply putting the ECD's electric switch in the erasing direction to erase the color, it becomes brighter and looks better.

Further, since only necessary visible light is transmitted and infrared rays are blocked, there is also an effect of alleviating infrared ray obstacles. Incidentally, the spectacle lens of the present invention is useful not only for patients with retinitis pigmentosa, but also for those at risk, cataract patients or those at risk thereof, and these applications are also included in the scope of the present invention. Be done.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a cross section of a spectacle lens according to an example of the present invention.

FIG. 2 is a conceptual diagram showing a cross section of an ECD (one example).

FIG. 3 is a conceptual diagram showing a cross section of a spectacle lens according to another example.

FIG. 4 is a conceptual diagram showing a cross section of a spectacle lens according to another example.

FIG. 5 is a graph showing a spectrum.

FIG. 6 is a graph showing a spectrum.

FIG. 7 is a graph showing a spectrum.

FIG. 8 is a graph showing a spectrum.

FIG. 9 is a graph showing a spectrum.

FIG. 10 is a graph showing a spectrum.

FIG. 11 is a graph showing a spectrum.

[Explanation of symbols]

1 ... "Stained lens substrate = conventional eyeglass lens for ophthalmic patient" 2 ... Glass lens 3 ... ECD 4 ... Adhesive 5 ... Protective glass lens S ... More than board

Claims (1)

[Claims] 1. A spectacle lens for an ophthalmic patient, which is dyed with an organic dye and therefore comprises a plastic lens that absorbs a part of visible light and ultraviolet rays, wherein the lens surface has "at least a pair of transparent electrode layers and A spectacle lens having a transmission electrochromic element composed of an electrochromic layer sandwiched therebetween.