JPH1043139A - Ophthalmologic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable visible fluorescent photographing and infrared fluorescent photographing through the same photographing part by projecting visible illuminating light and infrared illuminating light on the eyebottom of the eye to be examined, guiding reflected light from the eyebottom of the eye to be examined to an observation photographing part and correcting the optical path length of reflected light guided to the observation photographing part. SOLUTION: A photographic optical system is provided with a 1st photographic optical system for guiding reflected light to a 1st light receiving part 27 and a 2nd photographic optical system for guiding infrared fluorescent light to a 2nd light receiving part 28 such as a TV camera for infrared fluorescent light. Then, a quick return mirror 29 is provided so as to appear/disappear on the optical axis between an image forming lens 20 and a quick return mirror 21 of the 2nd photographic optical system, and photographic light excepting for infrared fluorescent light and the infrared fluorescent light included in the reflected light is separated to the side of the 1st light receiving part 27 or the 2nd light receiving part 28. In this case, the area from the quick return mirror 29 to the 1st light receiving part 27 is defined as a 1st optical path C1 for photographic light excepting for the infrared fluorescent light, and the area from the quick return mirror 29 to the 2nd light receiving part 28 is defined as a 2nd optical path C2 for infrared fluorescent light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus such as a fundus camera capable of performing visible fluorescence imaging or infrared fluorescence imaging of the fundus and an eye examination apparatus capable of examining the circulatory dynamics of the choroid and liver function. It is.

[0002]

2. Description of the Related Art A fundus camera as a conventional ophthalmologic apparatus includes:
In order to know the retinal circulation dynamics of the fundus of the eye to be examined and the state of the blood vessel-retinal barrier, those capable of performing visible fluorescence imaging and infrared fluorescence imaging are known.

[0003] A fundus camera for visible fluorescence photography injects a fluorescent agent of fluoresced sodium into a subject, illuminates the fundus of the eye with visible light having a wavelength capable of exciting the fluorescent agent, and emits illumination light. This is for photographing the fluorescence excited by.

In addition, a fundus camera for infrared fluorescence imaging injects indocyanine green into a subject, illuminates the fundus of the eye with infrared light having a wavelength capable of exciting this fluorescent agent, and emits infrared light. This is to photograph the infrared fluorescence excited by the above.

[0005]

However, the fundus camera for visible fluorescence photography cannot observe and photograph the circulatory dynamics of the choroid. In addition, the fundus camera for infrared fluorescence photography,
Although infrared fluorescence imaging is possible through the pigment epithelium layer and the macula, the retinal blood vessel image itself cannot be clearly captured.

For this reason, it is necessary to perform imaging other than infrared fluorescence with a fundus color other than infrared fluorescence imaging, and compare the imaging results of both.

However, since these are separately injected with a fluorescent agent, it is difficult to illuminate them in the same state in terms of time.

Therefore, the present invention corrects the optical path length of the fluorescence between the visible fluorescence imaging and the infrared fluorescence imaging, and simultaneously injects both fluorescent agents to make visible fluorescence and infrared fluorescence reflected from the fundus the same. An ophthalmologic apparatus capable of receiving visible light and infrared fluorescence with a single imaging unit by receiving light with the same imaging unit, and further capable of simultaneously imaging visible and infrared fluorescence with a single imaging unit The purpose is to provide.

[0009]

In order to solve the above-mentioned problems, a first aspect of the present invention is directed to an illumination optical system for projecting visible illumination light and infrared illumination light onto the fundus of the eye to be inspected; And an observation and imaging optical system for guiding the reflected light to an observation and imaging unit, wherein the observation and imaging optical system is provided with a correction unit for correcting an optical path length of the reflected light to be guided to the observation and imaging unit. I do.

According to a second aspect of the present invention, the observation / photographing section is provided with reflection / separation means for photographic light other than infrared fluorescence contained in the reflected light and infrared fluorescence photographic light, and is separated by the reflection / separation means. An imaging light receiving unit for imaging the imaging light other than the infrared fluorescent light and the infrared fluorescent imaging light is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention of an ophthalmologic apparatus according to the present invention will be described with reference to the drawings.

<First Embodiment> FIGS. 1 to 4 show a first embodiment of the present invention, and FIG. 1 shows an optical system of a fundus camera as an ophthalmologic apparatus according to the present invention. It is.

The optical system of the fundus camera transmits illumination light to the eye E to be examined.
And an observation and imaging optical system for guiding reflected light from the fundus Ef to an observation unit or an imaging unit.

[Illumination Optical System] The illumination optical system has a first illumination optical system for projecting illumination light and a second illumination optical system for projecting illumination light.

The first illumination optical system includes a reflection mirror 1, a halogen lamp 2 as an illumination light source, a condenser lens 3,
A half mirror 4, a band-pass filter 5, an effective aperture (ring aperture) 6, 7, a relay lens 8, an oblique mirror 9, relay lenses 10, 11, an oblique perforated mirror 12,
Optical components such as the objective lens 13 are provided in this order.

The light emitted from the halogen lamp 2 is supplied to a condenser lens 3, a half mirror 4, a band pass filter 5, an effective aperture (ring aperture) 6, 7, a relay lens 8, an oblique mirror 9, relay lenses 10, 11, It is guided in the order of the obliquely perforated mirror 12 and the objective lens 13 and irradiates the fundus Ef of the eye E to be illuminated to illuminate the fundus Ef.

The band pass filter 5 is provided on the optical axis of the illumination optical system so as to be freely inserted and removed. The bandpass filter 5 has a transmission wavelength range of 400 nm to 700 n.
An infrared transmission filter is prepared in addition to or in addition to two visible wavelength filters (see FIG. 2) and an exciter filter having a transmission wavelength range of 700 to 800 nm (see FIG. 3). Then, these filters are used alternatively.

The second illumination optical system includes a reflection mirror 14, a xenon lamp 15 as a photographing illumination light source, a condenser lens 16, and optical components from the half mirror 4 to the objective lens 13. And Xenon lamp 1
The light emitted from 5 is a condenser lens 16 and a half mirror 4, a bandpass filter 5, an effective stop (ring stop) 6, 7, a relay lens 8, an oblique mirror 9, relay lenses 10, 11, and an oblique perforated mirror. 12, guided in the order of the objective lens 13 and illuminated on the fundus Ef of the eye E to be illuminated to illuminate the fundus Ef.

[Observation and Imaging Optical System] The observation and imaging optical system has an observation optical system and an imaging optical system.

The observation optical system includes an objective lens 13, an obliquely perforated mirror 12, a diopter correction lens 17, a focusing lens 18,
The zoom lens includes a variable power lens 19, an imaging lens 20, a quick return mirror (flipping mirror) 21, a focus plate 22, a condenser lens 23, a reflection prism 24, and an eyepiece 25.

The reflected light from the fundus Ef is reflected by the objective lens 1
3. It is guided to the focus plate 22 via the obliquely holed mirror 12, the diopter correction lens 17, the focusing lens 18, the variable power lens 19, the imaging lens 20, and the quick return mirror 21. A fundus image due to the reflected light is formed on the focus plate 22, and the fundus image is observed by the examiner's eye 26 via the condenser lens 23, the reflection prism 24, and the eyepiece 25.

The photographing optical system includes a first photographing optical system for guiding reflected light to a first light receiving unit 27 such as a two-dimensional CD for general observation photographing, and a second light receiving unit 28 such as an infrared fluorescent TV camera. Has a second photographing optical system for guiding infrared fluorescence.

As the first light receiving section 27, a CCD or a TV camera which can perform any one of visible color photographing, visible black and white photographing, infrared light photographing, and the like, or a plurality or all of them can be used.

The first photographing optical system includes an optical system excluding the optical components from the quick return mirror 21 to the eyepiece 25 of the observation optical system, that is, optical components from the objective lens 13 to the imaging lens 20.

The second photographing optical system is located between the optical lens from the objective lens 13 to the image forming lens 20 and the image forming lens 20 and the quick return mirror 21 so that the second photographing optical system can appear and disappear on the optical axis of the observation optical system. , A quick return mirror 29, a barrier filter 30, and a reflection mirror 31.

The barrier filter 30 has a transmission wavelength range of 820 nm to 900 nm and a peak of 850 nm (see FIG. 4). Note that the illumination light for fluorescence excitation by the exciter filter includes light of about 800 nm, and the fluorescence transmission wavelength by the barrier filter 30 also includes light of about 800 nm. The transmitted light overlaps at around 800 nm. When the transmittance due to the overlap becomes 0.05% or more, the barrier filter 30
Infrared fluorescent light that passes through becomes false fluorescent light, and the contrast of an image due to the fluorescent light tends to decrease. Therefore,
The transmittance due to this overlap is set to 0.05% or less. In this embodiment, the quick return mirror 29 is used.
Are reflected light separating means.

The quick return mirror 29 is used as reflected light separating means for separating the photographing light other than the infrared fluorescent light and the infrared fluorescent light contained in the reflected light into the first light receiving section 27 or the second light receiving section 28. Can be From the quick return mirror 29 to the first light receiving unit 27, a first optical path C1 for photographing light other than infrared fluorescent light is provided.
A second optical path C2 for infrared fluorescence is provided from to the second light receiving unit 28.

The above-described illumination optical system and observation / photographing optical system use a lens coated with an anti-reflection coating so as to efficiently transmit a wavelength of 400 nm to 900 nm.

Next, the use of the fundus camera configured as described above will be described.

[Normal Observation] When the examiner observes the fundus oculi Ef of the eye E, the quick return mirror 29 is removed from the optical axis of the observation optical system as shown by a broken line, and the quick return mirror 21 is observed. The optical system is disposed on the optical axis of the first photographing optical system as shown by a solid line. On the other hand, the bandpass filter 5 is a visible wavelength filter in the wavelength range shown in FIG. 2, and the bandpass filter 5 is arranged on the optical axis of the first illumination optical system for projecting observation illumination light. Then, the halogen lamp 2 is turned on, and illumination light is emitted from the objective lens 13 to the fundus oculi Ef via the first illumination optical system. On this occasion,
A 400 wavelength is applied to the fundus oculi Ef by the action of the visible wavelength filter.
Visible light of m to 700 nm is applied. The reflected light reflected by the fundus oculi Ef by this irradiation is reflected by the objective lens 13, the obliquely perforated mirror 12, the diopter correcting lens 17, the focusing lens 1
8, is guided to the focus plate 22 via the variable power lens 19, the imaging lens 20, and the quick return mirror 21. A fundus image due to the reflected light is formed on the focus plate 22,
This fundus image is obtained by the condenser lens 23 and the reflection prism 2.
4. Observed by the examiner's eye 26 via the eyepiece 25. The fundus image can be displayed on a monitor TV (not shown) based on the output signal of the first light receiving unit 27 and observed.

[Fundus photography with observation and photographing light other than infrared fluorescent light] When photographing the fundus oculi Ef of the eye E with observation and photographing light other than infrared fluorescent light, the quick return mirror 21 is connected to the observation optical system. 1. Remove the quick return mirror 29 from the optical axis of the photographing optical system as shown by the broken line, and remove the quick return mirror 29 from the optical axis of the second photographing optical system of the observation optical system as shown by the broken line. The bandpass filter 5 is arranged on the optical axis of the first illumination optical system for projecting the observation illumination light using the visible wavelength filter in the wavelength range shown. Then, the xenon lamp 15 is turned on, and illumination light is transmitted from the objective lens 13 to the fundus E through the second illumination optical system.
Irradiate f. At this time, the fundus oculi Ef is irradiated with visible light of 400 nm to 700 nm by the action of a visible wavelength filter. The reflected light reflected by the fundus Ef by this irradiation passes through the objective lens 13, the obliquely perforated mirror 12, the diopter correction lens 17, the focusing lens 18, the variable power lens 19, and the imaging lens 20, and the first light receiving unit 27. To form a color or monochrome fundus image by visible light on the first light receiving unit 27.

In the case of using visible fluorescent light, the band-pass filter 5 is used as an exciter filter for visible fluorescent light, and a barrier filter for visible fluorescent light is inserted into the first optical path into the illumination optical system. Insert in conjunction with. Furthermore, in the case of using infrared light, if the bandpass filter 5 is replaced with an infrared transmission filter, a fundus image is formed by the first light receiving unit 27 infrared light.

[Fundus photography by infrared fluorescence] When the fundus oculi Ef of the eye E to be examined are photographed by infrared fluorescence observation photography light, the quick return mirror 29 is used as the light of the second photography optical system of the observation optical system. An exciter filter having a wavelength range of 700 nm to 800 nm and a peak of 750 nm shown in FIG. 3 is used as the band pass filter 5, and the band pass filter 5 is used for observation illumination light projection. Are arranged on the optical axis of the first illumination optical system.

On the other hand, a subject is injected with ICG, that is, indocyanine green. Within seconds to several tens of seconds after this injection, indocyanine green starts to circulate in the blood vessels of the fundus oculi Ef. At this time, the xenon lamp 15 is turned on, and illumination light is transmitted from the objective lens 13 to the fundus E through the observation illumination optical system.
Irradiate f. At this time, the fundus oculi Ef is irradiated with light of 700 nm to 800 nm by the action of the exciter filter. By this irradiation, ICG in the blood vessel of the fundus oculi Ef becomes 7
It absorbs light of 00 nm to 800 nm and is excited to emit infrared fluorescence. The infrared fluorescence excited in this manner is applied to the objective lens 13, the obliquely perforated mirror 12, the diopter correction lens 1
7, focusing lens 18, variable power lens 19, imaging lens 2
0, the light is guided to the second light receiving unit 28 via the barrier filter 30 and the reflection mirror 31, and a fundus blood vessel image by infrared fluorescence is formed on the second light receiving unit 28. At this time, the barrier filter 30 guides the infrared light having a peak of 850 nm at 820 nm to 900 nm to the second light receiving unit 28.

<Second Embodiment> FIGS. 5 to 7 show a second embodiment of the present invention. In the present embodiment, the first optical path C1 of the first photographing optical system of the observation optical system in the first embodiment is described.
This shows an example in which the barrier filter 32 is provided so as to be freely inserted and removed. As shown in FIG. 7, the barrier filter 32 has a transmission wavelength range of 520 nm to 640 nm.
One that transmits visible fluorescence having a peak at 0 nm is used. In this embodiment and the following embodiments, the illustration of the reflection mirror 31 is omitted.

In this case, as shown in FIG. 6, the bandpass filter 5 of the first illumination optical system for projecting the observation illumination light has a wavelength of 490 nm in a transmission wavelength range of 470 nm to 520 nm.
An exciter filter having a peak of is used.

In the case of the present embodiment, it is possible to photograph a fundus blood vessel image by ordinary visible fluorescence, which is obtained by injecting the subject with a fluorescein fluorescent agent, and to photograph a fundus blood vessel image by infrared fluorescence. You can also shoot.

<Third and Fourth Embodiments> FIG. 8 shows a third embodiment of the present invention.
FIG. 9 shows an embodiment, and FIG. 9 shows a fourth embodiment of the present invention. These two embodiments show other examples of the wavelength range of the exciter filter used for the band-pass filter 5 of the first and second embodiments.

The exciter filter in the wavelength range shown in FIG. 8 has both characteristics of the exciter filters shown in FIGS. This enables simultaneous observation and photographing of visible fluorescence and infrared fluorescence.

The exciter filter in the wavelength region shown in FIG. 9 has both the characteristics of the visible wavelength filter shown in FIG. 2 and the characteristics of the exciter filter shown in FIG. Even when this filter is used, simultaneous observation and photographing of visible fluorescence and infrared fluorescence are possible.

In the following embodiments, the band-pass filters 5 shown in the first to fourth embodiments are appropriately combined and used.

<Fifth Embodiment> FIG. 10 shows a fifth embodiment of the present invention.

In this embodiment, from the focus plate 22 to the eyepiece 25 in FIG.
A light receiving section 27 'for visible fluorescence photographing is provided at the position 2, and the first light receiving section 27 performs only monochrome photographing.

<Sixth Embodiment> FIG. 11 shows a sixth embodiment of the present invention.

In this embodiment, the quick return mirror 29 of the first embodiment is replaced by a dichroic mirror 3 coated with a coating that reflects infrared fluorescent light and transmits visible light.
3 shows an example in which 3 is used. The dichroic mirror 33 (reflected light separating means) has a characteristic of transmitting visible light up to 700 nm and reflecting light of 700 nm or more.

According to this embodiment, it is possible to simultaneously observe and photograph both the above-described fundus photography using visible light and a fundus blood vessel image using infrared fluorescence.

In this embodiment, the portion from the dichroic mirror 33 to the first light receiving section 27 is the first optical path C1 of the second photographing optical system of the observation optical system, and the dichroic mirror 3 is provided.
The area from No. 3 to the second light receiving unit 28 is the second optical path C2.

According to the present embodiment, it is possible to simultaneously observe and photograph both the above-described fundus photography with visible light and the fundus blood vessel image with infrared fluorescence.

<Seventh Embodiment> FIG. 12 shows an example in which the barrier filter 32 shown in the second embodiment is detachably provided in the first optical path C1 in the sixth embodiment.

<Eighth Embodiment> FIG. 13 omits the barrier filter 32 in the seventh embodiment (see FIG. 12) and sets the dichroic mirror 33 as a function of reflecting the wavelength of infrared fluorescent light and transmitting visible light. Make it a characteristic with a function. That is, in the present embodiment, the dichroic mirror 33 has a transmission wavelength range of 820 nm as shown in FIG.
It has a function of a barrier filter 30 that reflects infrared fluorescence with a peak of 850 nm at m to 900 nm and a function of a visible wavelength filter that transmits visible light up to 700 nm.

<Ninth Embodiment> FIG. 14 omits the barrier filters 30 and 32 in the seventh embodiment (see FIG. 12) and provides a dichroic mirror 33 with a function of reflecting the wavelength of infrared fluorescent light and a function of visible fluorescent light. It must have a characteristic that allows transmission. That is, in the present embodiment, the dichroic mirror 33 has the function of the barrier filter 30 that reflects infrared fluorescent light having a transmission wavelength range of 820 nm to 900 nm and a peak of 850 nm as shown in FIG. Barrier filter 32 that transmits visible fluorescence having a wavelength range of 520 nm to 640 nm and a peak of 570 nm.
Function.

<Tenth Embodiment> FIG. 15 shows a structure in which the quick return mirror 29 and the second light receiving part 28 in the first embodiment are arranged.
By omitting the steps up to this point, a bypass optical path including a dichroic mirror 33 as reflection light separating means, reflection mirrors 36 and 37, and a semi-transmission mirror 38 is formed in the photographing optical system, so that the dichroic mirror 33 including only the semi-transmission mirror 38 can be used. The optical path up to the first light receiving section 27 is the third optical path C3 of the second photographing optical system of the observation optical system, and the bypass optical path is the fourth optical path C4.
As (correction means), an example is shown in which a barrier filter 34 for infrared fluorescence having the same characteristics as the barrier filter 30 is detachably provided on the optical path C3 between the semi-transparent mirror 38 and the first light receiving section 27. It is.

Since visible light and infrared light have different wavelengths, the optical path length to the light receiving section 27 is slightly different between visible light and infrared light. As a result, if the optical path length up to the light receiving section 27 is adjusted to the visible light, a slight defocus may occur in the fundus image due to the infrared light, but the bypass optical path of the fourth optical path C4 is provided as described above. Thus, when the barrier filter 34 is inserted into the optical path, the optical path length of the infrared light to the light receiving unit 27 is corrected by the bypass optical path of the fourth optical path C4.

In this embodiment, the first light receiving section 27 is provided so as to be capable of photographing visible color, visible black and white, and infrared fluorescent light, as in the first embodiment. Note that the dichroic mirror 33 can be replaced with the quick retard mirror 29.

<Eleventh Embodiment> FIG. 16 shows a semi-transparent mirror by forming a detour optical path composed of a semi-transparent mirror 35, reflecting mirrors 36 and 37, and a semi-transparent mirror 38 as reflected light separating means in the optical path of the photographing optical system. An optical path from the semi-transparent mirror 35 including the first light receiving unit 27 to the first light receiving unit 27 is set as a fifth optical path C5 of the second photographing optical system of the observation optical system, and a detour optical path is set as a sixth optical path C6.
In the fifth optical path C5, a barrier filter 39 for visible fluorescence having the same characteristics as the barrier filter 32 is detachably disposed, and a barrier filter 34 for infrared fluorescence having the same characteristics as the barrier filter 30 is provided in the sixth optical path C6. It shows an example in which it can be freely inserted and removed.

<Twelfth Embodiment> FIG. 17 shows a structure in which the quick return mirror 29 to the second light receiving section 28 in the first embodiment are shown.
And an example in which a barrier filter 40 for visible fluorescence having the same characteristics as the barrier filter 32 and the barrier filter 34 for infrared fluorescence is detachably provided on the optical axis of the second photographing optical system of the observation optical system. It is shown.

In this embodiment, the light receiving section 27 is a visible color,
Visible black and white, visible fluorescent light, infrared black and white, and infrared fluorescent light are provided so that they can be photographed.

<Thirteenth Embodiment> FIG. 18 shows a structure in which the quick return mirror 29 and the second light receiving part 28 in the first embodiment are arranged.
Up to the third light receiving portion 27
A solid-state imaging device 41 having a light receiving unit 41a and a fourth light receiving unit 41b is arranged, and a quick return mirror 42 is arranged in the light receiving optical system, and an optical path from the quick return mirror 42 to the third light receiving unit 41a is set to the first position. A seventh optical path C7, an eighth optical path C8 from the quick return mirror 42 to the fourth light receiving section 41b, and a red light having the same characteristics as the barrier filter 30 between the reflecting mirror 43 and the fourth light receiving section 41b in the eighth optical path C8. A barrier filter 44 for external fluorescence is provided so as to be detachable, and a barrier filter 45 for visible fluorescence having the same characteristics as the barrier filter 32 is provided in the seventh optical path C7 so as to be removable.

<Fourteenth Embodiment> FIG. 19 shows the first embodiment of FIG.
This is an example in which the quick return mirror 42 of the third embodiment is replaced with a dichroic mirror 46 that reflects infrared fluorescent light and transmits visible light.

<Fifteenth Embodiment> FIG.
While omitting the barrier filter 44 of the fourth embodiment,
This is an example in which the dichroic mirror 46 has a function of transmitting visible light and reflecting infrared light, and the dichroic mirror 46 also functions as a barrier filter 44 of infrared light.

<Sixteenth Embodiment> FIG. 21 is a sectional view showing the first embodiment of FIG.
While omitting the barrier filter 45 of the fifth embodiment,
This is an example in which the dichroic mirror 46 has a function of transmitting visible fluorescence and reflecting infrared fluorescence, and the dichroic mirror 46 also functions as a barrier filter 44 for infrared fluorescence and visible fluorescence.

In the embodiment described above, the barrier filter and the band-pass filter can be inserted and removed on each optical path, and those other than those shown in FIG. Is also possible.

Incidentally, infrared light can be used for both observation and photographing light, and a photoelectric conversion element sensitive to infrared light can be provided as a light receiving portion, that is, a recording medium. In addition, it goes without saying that the present invention described above can be applied to an ophthalmologic apparatus such as an eye examination apparatus capable of examining the circulatory dynamics of the choroid, liver function, and the like.

[0064]

As described above, according to the first aspect of the present invention, an illumination optical system for projecting visible illumination light and infrared illumination light onto the fundus of the eye to be examined, and observing and photographing light reflected from the fundus of the eye to be examined. The observation and photographing optical system includes a correcting unit that corrects the optical path length of the reflected light to be guided by the observation and photographing unit. With the optical path length adjusted to each wavelength, visible fluorescence and infrared fluorescence reflected from the fundus are received by the same imaging unit, and visible fluorescence imaging and infrared fluorescence imaging can be performed by one imaging unit.

According to a second aspect of the present invention, the observation / photographing section is provided with reflection / separation means for separating the photographic light other than the infrared fluorescent light and the infrared fluorescent photographic light contained in the reflected light, Since the imaging light receiving unit for imaging the imaging light other than the infrared fluorescence and the infrared fluorescence imaging light is provided, one imaging unit can simultaneously image visible fluorescence imaging and infrared fluorescence imaging.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a fundus camera as an ophthalmologic apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a wavelength band of the bandpass filter shown in FIG.

FIG. 3 is an explanatory diagram showing an example of a wavelength range of the bandpass filter shown in FIG. 1;

4 is an explanatory diagram showing an example of the wavelength range of the barrier filter for infrared fluorescence shown in FIG. 1;

FIG. 5 is a configuration diagram illustrating a first photographing optical system of an observation optical system according to a second embodiment.

FIG. 6 is an explanatory diagram showing an example of a wavelength range of the bandpass filter shown in FIG. 5;

FIG. 7 is an explanatory view showing an example of the barrier filter for visible fluorescence similarly shown in FIG. 5;

FIG. 8 is an explanatory diagram showing another example of the wavelength range of the bandpass filter shown in FIG. 1 in the third embodiment.

FIG. 9 is an explanatory diagram showing another example of the wavelength range of the bandpass filter shown in FIG. 1 in the fourth embodiment.

FIG. 10 is a configuration diagram showing a configuration of a fifth embodiment.

FIG. 11 is a configuration diagram showing a configuration of a sixth embodiment.

FIG. 12 is an arrangement diagram of a barrier filter according to a seventh embodiment.

FIG. 13 is a configuration diagram illustrating a configuration of an eighth embodiment.

FIG. 14 is a configuration diagram showing a configuration of a ninth embodiment.

FIG. 15 is a configuration diagram showing a configuration of a tenth embodiment.

FIG. 16 is a configuration diagram showing a configuration of an eleventh embodiment.

FIG. 17 is a configuration diagram showing a configuration of a twelfth embodiment.

FIG. 18 is a configuration diagram showing a configuration of a thirteenth embodiment.

FIG. 19 is a configuration diagram showing a configuration of a fourteenth embodiment.

FIG. 20 is a configuration diagram showing a configuration of a fifteenth embodiment.

FIG. 21 is a configuration diagram showing a configuration of a sixteenth embodiment.

[Explanation of symbols]

 27: Observation / photographing unit 33: Reflected light separation means C4, C6: Fourth and sixth optical paths (correction means)

Claims (2)

[Claims] 1. An illumination optical system for projecting visible illumination light and infrared illumination light onto a fundus of an eye to be inspected, and an observation imaging optical system for guiding reflected light from the fundus of the eye to an observation imaging unit,
An ophthalmologic apparatus, wherein the observation and imaging optical system includes a correction unit that corrects an optical path length of the reflected light guided by the observation and imaging unit. 2. The observation / photographing section is provided with reflection / separation means for imaging light other than infrared fluorescence contained in the reflected light and imaging light of infrared fluorescence, and the infrared fluorescence separated by the reflection / separation means is provided. The ophthalmologic apparatus according to claim 1, further comprising an imaging light receiving unit that captures imaging light other than the above and imaging light of infrared fluorescence.