JP2019042478A - Ophthalmologic microscope - Google Patents

Abstract

To provide an ophthalmologic microscope capable of observing and acquiring an image of an anterior eye part and a posterior eye part without changing the positional relationship between the objective lens and the subject eye.SOLUTION: The ophthalmologic microscope includes: an observation optical system 400 having a first focal point in front of a subject eye 81; an objective auxiliary lens 82 which can be mounted at a position to a subject eye side of an objective lens 2 in the observation optical system 400 and can be released from the position, the objective auxiliary lens, when mounted, setting the focal point to a second focal point which is the position of the anterior eye part of the subject eye 81; and a preliminary lens 14 which can be mounted at a position closer to the subject eye side than to the first focal point and can be released from the position, the preliminary lens, when mounted, setting the focal point to a third focal point which is the position of the posterior eye part of the subject eye 81. To observe the anterior eye part, the objective auxiliary lens 82 is mounted and the preliminary lens 14 is released. To observe the posterior eye part, the preliminary lens 14 is mounted and the objective auxiliary lens 82 is released.SELECTED DRAWING: Figure 1

Description

The present invention relates to an ophthalmologic microscope having a function of switching between anterior ocular segment observation (for example, observation of cornea, anterior capsule, sclera etc.) and posterior eye observation (for example, retinal observation) for an eye to be examined. The present invention relates to an ophthalmic microscope that can perform anterior segment observation and posterior segment observation without changing the positional relationship between an objective lens and an eye to be examined.
Further, the present invention relates to an OCT function expansion unit for adding an OCT measurement optical system (OCT: Optical Coherence Tomography) to an observation optical system of an ophthalmologic microscope, and an objective lens and a subject are obtained by adding an OCT function expansion unit. The present invention relates to an OCT function expansion unit capable of switching between anterior segment observation and posterior segment observation without changing the positional relationship with the optometry.

An ophthalmologic microscope is a medical or examination instrument capable of illuminating a patient's eye to be examined with an illumination optical system and magnifying and observing the eye to be examined by an observation optical system including a lens or the like.
Some ophthalmologic microscopes have a function of observing an anterior segment (for example, cornea, anterior capsule, sclera etc.) and a function for observing a posterior segment (for example, retina).
In this type of ophthalmic microscope, as shown in FIG. 16A, the objective lens 71 and the eye to be examined are positioned so that the anterior eye of the eye to be examined is positioned at the focal point 70 of the observation optical system. 72 and relative arrangement.
On the other hand, as shown in FIG. 16B, when observing the posterior segment, the relative position between the objective lens 71 and the subject's eye 72 is changed so as to increase the distance between them, and the subject's eye 72 and the focal point 70 The front lens 74 is placed between them. The front lens is selected in characteristics and arrangement such that the focal point is located on the retina 722 through the lens 721 of the eye 72 to be examined.
In FIGS. 16A and 16B, the optical axis of the right side observation optical system and the optical axis of the left side observation optical system are indicated by O-R and O-L.

In addition, various ophthalmic microscopes incorporating an OCT function are known.
As shown in FIG. 17 (a drawing obtained by quoting FIG. 1 of Patent Document 1), the ophthalmic microscope is configured to transmit the optical axis of the observation optical system for the left eye and the optical axis of the observation optical system for the right eye An observation optical system including a pair of lens groups 130, 140, 150, 170, 180, and an objective lens which transmits the optical axis of the left-eye observation optical system and the optical axis of the right-eye observation optical system in common 110, OCT measurement optical systems 200, 250, 450, 460, and 470, and illumination optical systems 310, 320, and 330. In the OCT measurement optical system, output light from the OCT light source 200 is emitted by passing through the optical fiber 250, and its direction is controlled by the two scanning mirrors 450 and 460, and then from the illumination optical system in the beam combiner 340 The reflected light is reflected by the beam splitter 120 and enters the eye 1000.
The ophthalmic microscope shown in FIG. 17 makes it possible to obtain tomograms of the retina, cornea, anterior capsule, sclera etc. of the eye to be examined, and to observe not only the surface but also the internal state of the tissue. This can increase the accuracy of diagnosis of eye diseases and increase the success rate of eye surgery.

JP-A-8-66421

However, in the conventional ophthalmologic microscope as shown in FIG. 17, when observing the retina or acquiring an OCT tomographic image of the retina, observing the cornea, anterior capsule, sclera etc., or measuring the cornea, anterior capsule, strong When acquiring an OCT tomogram of a film or the like, the distance between the ophthalmologic microscope and the eye to be examined must be changed, which causes problems such as a decrease in the efficiency of a medical checkup, a treatment, and the like.
Therefore, in view of the above-mentioned conventional situation, the present invention provides an ophthalmic microscope capable of observing the anterior segment and the posterior segment and acquiring a tomogram without changing the positional relationship between the objective lens and the eye to be examined. The purpose is to
In addition, it is a function extension that can incorporate the function of observing and acquiring a tomogram of the anterior and posterior eye sections without changing the positional relationship between the objective lens and the eye to be examined, to the existing specification ophthalmic microscope. It also aims to provide units.

In order to solve the above problems, the inventors of the present application conducted earnest research and as a result, when observing the anterior segment (e.g., cornea, anterior capsule, sclera etc.) and the posterior segment (e.g., retina) in an ophthalmologic microscope By changing the focal point position of the observation optical system along the optical axis when detecting, observation of the anterior segment and observation of the posterior segment without changing the positions of the ophthalmic microscope and the subject's eye The present invention has been made based on the finding that it can be carried out.
In addition, when the OCT measuring optical system is detachably united to the existing specification of the ophthalmic microscope, the ophthalmic microscope and the ophthalmic microscope can be provided with the function of changing the focal position of the observation optical system along the optical axis. Invention of function expansion unit based on the finding that it is possible to provide an ophthalmologic microscope capable of OCT measurement capable of performing observation of the anterior segment and acquisition of a tomographic image of the posterior segment without changing the position of the subject's eye I came to

That is, the ophthalmic microscope of the present invention is summarized as follows.
(1) An ophthalmic microscope having a function of switching between an anterior segment observation (for example, observation of cornea, anterior capsule, sclera, etc.) and a posterior segment observation (for example, retinal observation) for an eye to be examined,
An observation optical system having a first focal point in front of the subject's eye;
It can be set at a position on the subject eye side of the objective lens in the observation optical system (between the objective lens and the subject eye, the side of the objective lens rather than the in-focus point) or on the opposite side to the subject eye A lens that can be released from the lens, and an objective auxiliary lens that sets the in-focus point when it is set to a second in-focus point that is the anterior eye position of the subject eye;
A lens which can be set at a position closer to the eye to be examined than the first in-focus point (position between the first in-focus point and the eye to be examined) or can be released from the position. A front lens for setting a focal point through a lens (including an artificial lens) of the subject's eye to a third focal point, which is a back eye position of the subject's eye;
Equipped with
In the anterior segment observation, the objective auxiliary lens is set and the front lens is released without changing the positional relationship between the objective lens and the eye to be examined.
In the rear eye observation, the front lens is set and the objective auxiliary lens is released without changing the positional relationship between the objective lens and the eye to be examined.
An ophthalmic microscope characterized by.
(2) The ophthalmic microscope according to (1), further including an OCT measurement optical system, wherein the OCT measurement optical system includes an OCT measurement optical system objective lens.
(3) The OCT measurement optical system further includes: a first optical member for guiding light from the OCT light source in a first optical axis direction;
A first reflection member for guiding light guided in the first optical axis direction to a second optical axis direction substantially orthogonal to the first optical axis direction;
A second optical member relaying the light guided in the second optical axis direction;
A second reflecting member for guiding light relayed by the second optical member in a third optical axis direction substantially orthogonal to the second optical axis direction;
Have
The OCT measurement optical system objective lens is disposed on the third optical axis direction, and irradiates the light guided in the third optical axis direction to a predetermined part of the eye to be examined ( The ophthalmic microscope described in 2).
(4) The observation optical system includes the objective lens having a shape in which a part of a circular lens is cut (with a cut surface parallel to the optical axis),
The OCT measurement optical system has the OCT measurement optical system objective lens disposed in the ablated part of the objective lens, and has a first focal point in front of the eye to be examined and an OCT measurement A light path of light is configured to pass through the objective lens;
When the objective auxiliary lens is set and the front lens is released, the in-focus point is set to a second in-focus position, which is the anterior eye position of the subject eye, and the OCT measurement of the anterior eye portion is performed. ,
When the pre-lens is set and the objective auxiliary lens is released, the in-focus point is set to a third in-focus point, which is the back eye position of the subject eye, and the OCT measurement of the back eye is performed ,
The ophthalmic microscope according to (2) or (3), characterized in that
(5) The front lens is released when the objective auxiliary lens is set, and the objective auxiliary lens is released when the front lens is set (1) to (4) The ophthalmic microscope according to any one of the above.
(6) The ophthalmic microscope according to any one of (1) to (5), wherein the objective auxiliary lens is a concave lens.
(7) The ophthalmic microscope according to any one of (1) to (6), including a plurality of types of the pre-lenses and a plurality of types of objective auxiliary lenses corresponding to the respective pre-lenses. .
(8) By having an anterior lens which can be set or released in the light path of the observation optical system, OCT measurement can be performed on the main body of the ophthalmologic microscope that can switch between anterior eye observation and posterior eye observation for the eye to be examined. In the OCT function expansion unit to which an optical system is added,
A replacement objective lens for replacing an objective lens of an observation optical system of the microscope main body;
The replacement objective lens has a shape in which a part of a circular lens is cut off,
An OCT measurement optical system objective lens is provided at the cut portion of the replacement objective lens,
The observation optical system in which the objective lens is replaced with the replacement objective lens, and the OCT measurement optical system have a first focal point in front of the subject's eye.
A lens which can be set at the eye side of the subject or the opposite side to the eye to be examined with respect to the replacement objective lens and the OCT measurement optical system objective lens, or can be released from the position. An objective auxiliary lens for setting the lens position to a second focal point which is the anterior eye position of the subject eye;
When the front lens is set at a position closer to the subject's eye than the first in-focus point, a third in-focus point where the in-focus point of the subject's eye via the lens is the back eye position of the subject's eye Set to focus
During the anterior segment observation, the objective auxiliary lens is set and the anterior lens is released,
During the rear eye observation, the front lens is set and the objective auxiliary lens is released.
The front eye part observation and the back eye part observation can be switched by the observation optical system and the OCT measurement optical system without changing the positional relationship between the objective lens and the eye to be examined. OCT function expansion unit.
(9) The OCT measurement optical system is
A first optical member for guiding light from an OCT light source in a first optical axis direction;
A first reflection member for guiding light guided in the first optical axis direction to a second optical axis direction substantially orthogonal to the first optical axis direction;
A second optical member relaying the light guided in the second optical axis direction;
A second reflecting member for guiding light relayed by the second optical member in a third optical axis direction substantially orthogonal to the second optical axis direction;
And have
The OCT measurement optical system objective lens is disposed on the third optical axis direction, and irradiates the light guided in the third optical axis direction to a predetermined part of the eye to be examined ( The OCT function expansion unit as described in 7).

It is possible to observe the anterior segment and the posterior segment and obtain a tomogram without changing the positional relationship between the objective lens and the subject's eye.
Incorporating a function that enables observation and acquisition of tomograms of the anterior segment and the posterior segment without changing the positional relationship between the objective lens and the subject's eye in the existing specification ophthalmic microscope by the OCT function expansion unit Can.

It is a side schematic diagram which shows the ophthalmic microscope of 1st Embodiment of this invention which does not contain the OCT measurement optical system at the time of observing an anterior segment. It is a front schematic diagram which shows the ophthalmic microscope of 1st Embodiment of this invention which does not contain the OCT measurement optical system at the time of observing an anterior segment. FIG. 3A shows the observation optical system of the ophthalmic microscope shown in FIGS. 1 and 2 when observing the anterior segment (observation optical system in which the objective auxiliary lens is provided on the eye side of the objective lens for observation). It is a schematic diagram which shows, FIG. 3 (B) is a schematic diagram which shows the observation optical system in which an objective auxiliary lens is provided in the opposite side to the to-be-tested eye side of the objective lens for observation. It is a side schematic diagram which shows the ophthalmic microscope of 1st Embodiment of this invention which does not contain the OCT measurement optical system at the time of observing an anterior segment. It is a front schematic diagram which shows the ophthalmic microscope of 1st Embodiment of this invention which does not contain the OCT measurement optical system at the time of observing an anterior segment. FIG. 6A shows the observation optical system (observation optical system in which the objective auxiliary lens is provided on the eye to be examined side of the observation objective lens) of the ophthalmic microscope shown in FIG. 1 and FIG. FIG. 6 (B) is a schematic view showing an observation optical system in which an objective auxiliary lens is provided on the opposite side to the eye side of the observation objective lens. It is a side schematic diagram which shows the ophthalmic microscope of 2nd Embodiment of this invention containing an OCT optical system at the time of observing an anterior segment. It is a front schematic diagram which shows the ophthalmic microscope of 2nd Embodiment of this invention containing the OCT measurement optical system at the time of observing an anterior segment. It is a front schematic diagram which shows the ophthalmologic microscope of 2nd Embodiment of this invention containing an OCT measurement optical system at the time of observing a back eye part. FIG. 10A is a schematic view showing an OCT measurement optical system when observing an anterior segment, and FIG. 10B is a schematic view showing an OCT measurement optical system of an ophthalmologic microscope according to a second embodiment of the present invention. ) Is a schematic view showing an OCT measurement optical system when observing the posterior segment. It is a top view of the OCT measurement optical system shown in FIG. It is a side view of the OCT measurement optical system shown in FIG. It is a front view of the OCT measurement optical system shown in FIG. It is explanatory drawing of an OCT apparatus used with the ophthalmologic microscope of the 2nd Embodiment of this invention. It is explanatory drawing which shows the design aspect of the objective lens of this invention. FIG. 16 (A) shows an observation optical system when observing the anterior segment with an ophthalmologic microscope, and FIG. 16 (B) shows an observation optical system when observing a posterior segment with an ophthalmologic microscope is there. It is explanatory drawing of the prior art of the ophthalmologic microscope which mounts an OCT function.

1. The ophthalmic microscope of the present invention In the ophthalmic microscope of the present invention, the observation optical system is a lens that makes it possible to observe the eye by return light reflected / scattered from the eye illuminated by the illumination optical system, It is configured to include an optical element such as a prism. In the present invention, the observation optical system can have an observation optical system for the left eye and an observation optical system for the right eye, and when parallax is produced in the images obtained by the left and right observation optical systems, binocular vision It also becomes possible to observe three-dimensionally.
Further, the observation optical system of the present invention may be capable of directly observing the eye to be examined by the naked eye of the observer through an eyepiece, an eyepiece lens or the like, or reflected light from the eye by a CCD or the like. May be received and displayed on the display, or may be viewed directly by the naked eye and displayed on the display.
The observation optical system including the left-eye observation optical system and the right-eye observation optical system includes an objective lens through which the optical axis of the left-eye observation optical system and the optical axis of the right-eye observation optical system are transmitted in common.
In the present invention, the objective lens is, for example, a lens incorporated on the side of an eye to be examined in an ophthalmic microscope body.
The front lens (loupe) is used by being inserted in a removable manner between the objective lens and the eye to be examined (near the subject's eye) and is not called an objective lens in the present invention.
The illumination optical system is configured to include an optical element for illuminating the eye to be examined. The illumination optical system may guide natural light to the eye to be examined, but is generally configured to include an illumination light source and to guide light from the illumination light source to the eye to be examined. The illumination optical system can be configured to include the objective lens included in the above-described observation optical system.

The microscope optical system according to the present invention takes in light from an OCT light source provided in an OCT apparatus, and sends a collimator (optical member for OCT interface) to return return light from the subject's eye irradiated with the light to the OCT apparatus. Can be included. In this case, the microscope optics can include OCT measurement optics, or even OCT reference light optics, and can further incorporate an OCT light source.
In the microscope optical system of the present invention, the objective lens of the observation optical system can be partially removed, and the objective lens of the OCT measurement optical system is provided in the removed portion.
With such a configuration, in the microscope optical system of the present invention, the OCT measurement optical system is independent of the observation optical system. Therefore, in the optical design of the microscope optical system of the present invention, it is not necessary to consider the mutual influence between the observation optical system and the OCT measurement optical system.
Thus, the microscope optical system of the present invention has an effect of increasing the degree of freedom in optical design.
For example, by separately controlling the position of the objective lens of the observation optical system and the objective lens of the OCT measurement optical system, optical design capable of independently adjusting the focus of the observation optical system and the focus of the OCT measurement optical system is possible Become.
In addition, an XY scanning mechanism or a Z scanning mechanism can be mounted on the measurement light path of the OCT measurement optical system. These mechanisms can be made, for example, by MEMS.
In addition, the OCT measurement optical system can be detachably incorporated into the observation optical system as one unit. In addition, by incorporating a plurality of OCT measurement optical systems into the microscope optical system, it is also possible to perform optical design capable of obtaining a more detailed three-dimensional tomogram of the observation object.
In the present invention, for example, a lens, a prism, a mirror, an optical filter, an aperture, a diffraction grating, a polarizing element or the like can be used as an optical element used for an observation optical system, an illumination optical system and an OCT measurement optical system.

In the present invention, an ophthalmologic microscope is a medical or examination instrument capable of magnifying and visually observing an eye to be examined, and includes not only humans but also animals.
The “ophthalmic microscope” includes, but is not limited to, for example, a fundus camera, a slit lamp, a microscope for ophthalmologic surgery, and the like.

2. First Embodiment Hereinafter, an example of an ophthalmic microscope (hereinafter, simply referred to as a “microscope”) according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view of a microscope 1 having an observation function but not an OCT function (tomography function), and FIG. 2 is a front schematic view of the same. It shows the observation of the anterior capsule, sclera etc.). Further, FIG. 3A is a schematic view of an observation optical system 400 (an observation optical system in which an objective auxiliary lens is provided on an eye side of an observation objective lens) of the microscope shown in FIGS.
As shown in FIG. 1, the microscope 1 includes an illumination optical system 300 (not shown in FIG. 2) in addition to the observation optical system 400.
The observation optical system 400 can observe the retina of an observation target (the eye 81 to be examined in FIGS. 1 and 2). As shown in FIG. 1, the illumination optical system 300 can illuminate a portion of the subject's eye 81 to be observed.
In FIG. 1 and FIG. 2, the observation optical system has a first in-focus point U1 in front of the eye 81 to be examined.

As clearly shown in FIG. 2, the observation optical system 400 has a right-eye observation optical system 400R and a left-eye observation optical system 400L. In FIG. 1, the entire configuration is shown for the right-eye observation optical system 400R, and only the objective lens 2 shared with the right-eye observation optical system 400R is shown for the left-eye observation optical system 400L. .
Further, as clearly shown in FIG. 2, the optical axis O-400R of the right-eye observation optical system 400R and the optical axis O-400L of the left-eye observation optical system 400L pass through the objective lens 2 respectively.
In the present embodiment, the illumination optical system 300 and the observation optical system 400 are housed in the microscope main body 6. In FIG. 1 and FIG. 2, the microscope main body 6 is shown by a dashed dotted line.

The illumination optical system 300 shown in FIG. 1 includes an illumination light source 9, an optical fiber 301, an exit light aperture 302, a condenser lens 303, an illumination field aperture 304, a collimator lens 305 and a reflection mirror 306. The optical axis of the illumination optical system 300 is indicated by O-300.
As shown in FIG. 1, the illumination light source 9 is provided outside the microscope main body 6 in this embodiment. One end of an optical fiber 301 is connected to the illumination light source 9. The other end of the optical fiber 301 is disposed at a position facing the exit light stop 302 of the microscope main body 6. The illumination light emitted from the illumination light source 9 is guided by the optical fiber 301 and enters the condenser lens 303 via the outgoing light diaphragm 302.
The exit light stop 302 acts to block a partial area of the exit of the optical fiber 301. When the blocking area by the outgoing light diaphragm 302 is changed, the outgoing area of the illumination light is changed. Thus, it is possible to change the irradiation angle by the illumination light, that is, the angle formed by the incident direction of the illumination light to the eye 81 to be examined and the optical axis of the objective lens 2.

The illumination field stop 304 is provided at a position (position of x) optically conjugate with the first focusing point U1 of the objective lens 2. The collimating lens 305 converts the illumination light having passed through the illumination field stop 304 into a parallel light flux. The reflection mirror 306 reflects the illumination light collimated by the collimator lens 305 toward the observation objective lens 2. The light reflected by the reflection mirror 306 is transmitted through the objective lens 2 and irradiated to the eye 81 to be examined.
The illumination light emitted to the subject eye 81 is reflected and scattered by the tissue of the retina. The reflected and scattered return light (also referred to as “observation light”) passes through the objective lens 2 and is incident on the observation optical system 400.

The observation optical system 400 is used to observe the subject eye 81 illuminated by the illumination optical system 300 through the objective lens 2.
As shown in FIGS. 1 and 2, a variable magnification lens system 401 (lenses 401a, 401b, and 401c), a beam splitter 402 (a beam splitter for obtaining image information for displaying a television camera), an imaging lens 403, An image erecting prism 404, an eye width adjusting prism 405, a field stop 406, and an eyepiece 407 are included. The optical axis of the observation optical system 400 is indicated by O-400.

  As shown in FIG. 2, the beam splitter 402 of the right-eye observation optical system 400R separates a part of the observation light guided from the subject eye 81 along the right-eye observation optical system and takes a photographing optical system. Lead to 1100. The photographing optical system 1100 includes an imaging lens 1101, a reflection mirror 1102, and a television camera 1103. The image information acquired by the television camera 1103 is sent to a monitor (not shown) and displayed.

As shown in FIGS. 1 and 2, the image erecting prism 404 converts an inverted image into an erected image. The eye width adjusting prism 405 is an optical element for adjusting the distance between the left and right observation light paths according to the eye width (the distance between the left eye and the right eye) of the observer. The field stop 406 blocks the peripheral region in the cross section of the observation light to limit the observer's field of view. The field stop 406 is provided at a position (x position) conjugate with the first focusing point U 1 of the objective lens 2.
The right-eye observation optical system 400R and the left-eye observation optical system 400L may be configured to include a stereo variator configured to be insertable into and removable from the light path. The stereo variator is an optical axis position change element for changing the relative position of the optical axes O-400L and O-400R of the left and right observation optical systems respectively guided by the left and right variable magnification lens systems 401. The stereo variator, for example, is retracted to a retraction position provided on the observer side with respect to the observation light path.

In the microscope 1 of FIGS. 1 and 2, the observation optical system has a first in-focus point (indicated by U 1 in front of the subject eye 81 when no lens is present between the objective lens 2 and the subject eye 81). )have.
In the microscope 1, an objective auxiliary lens 82 is provided on the eye 81 side of the objective lens 2.
The objective auxiliary lens 82 can be set at a position closer to the objective lens 2 between the first focusing point U1 and the objective lens 2, or can be released from this position. The objective auxiliary lens 82 is selected such that the in-focus point when set is the second in-focus point (U2) which is the anterior eye position of the eye to be examined.
3A shows the case where the objective auxiliary lens 82 is provided on the side of the subject's eye 81 of the objective lens 2 in the observation optical system when observing the anterior segment of the subject's eye 81. In the present invention, as shown in FIG. 3B, the objective auxiliary lens 82 can be provided on the opposite side of the objective lens 2 to the subject's eye 81 to observe the anterior segment of the subject's eye 81.

FIG. 4 is a side view corresponding to FIG. 1 showing how the posterior eye portion (eg, retina) of the eye 81 to be examined is observed in the apparatus described with reference to FIGS. 1 and 2. 5 is a front view corresponding to FIG. 2, and FIG. 6 (A) is a schematic view corresponding to FIG. 3 (A).
In FIG. 4 and FIG. 5, the front lens 14 is set at a position closer to the eye to be examined 81 than the first in-focus point U1, and the focal point through the lens of the eye to be examined 81 when set The three in-focus points U3) are set at the position of the retina of the eye 81 to be examined (posterior eye position).
When the objective auxiliary lens 82 is provided on the opposite side of the objective lens 2 to the subject's eye 81 (see FIG. 3 (B)), when observing the back eye part of the subject's eye 81, FIG. As shown in (B), the objective auxiliary lens 82 needs to be released.

3. Second Embodiment Hereinafter, an embodiment of the ophthalmic microscope 1 having an OCT function (tomographic imaging function) will be described.
Preferably, the OCT measuring optical system can be additionally incorporated as an expanding function into an ophthalmic microscope having an observation optical system and an illumination optical system. The present inventors have found that, in order to additionally incorporate them in this way, the optical path of the OCT measuring optical system can be folded in two times to be adapted to the original function of the microscope and to be compactly incorporated.

That is, the ophthalmic microscope of the present invention further comprises an OCT measuring optical system,
OCT measuring optical system
A first optical member for guiding light from an OCT light source in a first optical axis direction;
A first reflection member for guiding light guided in a first optical axis direction to a second optical axis direction substantially orthogonal to the first optical axis direction;
A second optical member relaying light guided in the second optical axis direction;
And a second reflecting member for guiding the light relayed by the second optical member in a third optical axis direction substantially orthogonal to the second optical axis direction,
Preferably, the OCT measurement optical system objective lens is disposed on the third optical axis so that the light guided in the third optical axis direction can be irradiated to a predetermined part of the eye to be examined.
With such an optical configuration, the OCT measuring optical system can be compactly fitted to the original function of the ophthalmic microscope.

Hereinafter, an example of an embodiment of the ophthalmologic microscope of the present invention having an OCT measurement optical system in which the optical path is bent twice will be described in detail with reference to the drawings.
FIGS. 7-14 is drawing which shows typically 2nd Embodiment which is another example of the ophthalmic microscope of this invention.

FIG. 7 is a schematic side view of the ophthalmic microscope 1, and FIG. 8 is a schematic front view of the anterior segment (e.g., cornea, anterior capsule, sclera etc.). FIG. 9 is a schematic front view showing an ophthalmologic microscope when observing a posterior segment (for example, the retina).
As shown in FIG. 7, FIG. 8 and FIG. 9, an OCT apparatus 5 is juxtaposed to the ophthalmic microscope 1.
The ophthalmic microscope 1 includes an illumination optical system 300 (not shown in FIGS. 8 and 9), an observation optical system 400, and an OCT measurement optical system 500.
The observation optical system 400 can observe a predetermined part of an observation target (the eye 81 to be examined in FIGS. 7, 8 and 9). As shown in FIG. 7, the illumination optical system 300 can illuminate a portion of the subject's eye 81 to be observed.

The OCT apparatus 5 provided in parallel with the ophthalmic microscope 1 can acquire a tomographic image of the subject's eye 81. The OCT measurement optical system 500 is incorporated in the ophthalmic microscope 1 as a part of the OCT apparatus 5. The OCT measurement optical system 500, the front lens 14, and the reflection surface (cornea, retina, etc.) of the eye 81 to be examined constitute a reciprocation light guide path of the measurement light.
As clearly shown in FIGS. 8 and 9, the observation optical system 400 has a right-eye observation optical system 400R and a left-eye observation optical system 400L. In FIG. 7, the entire configuration is shown for the right-eye observation optical system 400R, and only the objective lens 2 shared with the right-eye observation optical system 400R is shown for the left-eye observation optical system 400L. .
Further, as clearly shown in FIGS. 8 and 9, the optical axis O-400R of the right-eye observation optical system 400R and the optical axis O-400L of the left-eye observation optical system 400L pass through the objective lens 2 respectively. ing.
In the present embodiment, the illumination optical system 300 and the observation optical system 400 are housed in the ophthalmic microscope main body 6. Further, the OCT measurement optical system 500 is accommodated in the OCT function expansion unit 7. In FIG. 7, FIG. 8 and FIG. 9, the ophthalmic microscope main body 6 is shown by a dashed dotted line, and the OCT function expansion unit 7 is shown by a dashed line.
The OCT function expansion unit 7 is connected to the ophthalmic microscope main body 6 so as to be removable / attachable by a joint (not shown).

As shown in FIGS. 7, 8 and 9, the OCT apparatus 5 comprises an OCT unit 10 and an OCT function expansion unit 7.
An OCT measurement optical system 500 is accommodated in the OCT function expansion unit 7.
10A shows a perspective view of the OCT measurement optical system 500 in the configuration of FIG. 8, and FIG. 10B shows a perspective view in the configuration of FIG. 11 is a plan view of the OCT measurement optical system 500, FIG. 12 is a side view of the same, and FIG. 13 is a front view of the same. The collimating lens 502, the scanning function unit 503, and the first optical member 510 (described later) are not shown in FIGS. 11 and 13.
10 and 12, the OCT measurement optical system 500 includes a collimator lens 502, a scanning function unit 503, a first optical member 510, a first reflection member 511, a second optical member 512, a second reflection member 513, and an OCT measurement. The optical system objective lens 507 is included.

The scanning function unit 503 is a two-dimensional scanning mechanism having galvano mirrors 503a and 503b. The scanning function unit 503 is provided on the back side (the side far from the observer) of the ophthalmic microscope main body 6.
The first optical member 510 is an OCT imaging lens, and guides the light scanned by the scanning function unit 503 in the direction of the first optical axis O-501. The first optical axis O-501 is formed from the back to the front at the right outer position of the ophthalmic microscope main body 6 when the ophthalmic microscope main body 6 is viewed from the front, and the scanning function unit 503 The scanned light is guided from the back to the front side of the first optical axis O-501.

As shown in FIGS. 10, 11, 12 and 13, the light guided through the first optical axis O-501 is orthogonal to the direction of the first optical axis O-501 by the first reflecting member 511. The light is guided in the direction of the second optical axis O-502.
In the present embodiment, as shown in FIGS. 8 and 9, the second optical axis O-502 is formed to face inward from the outside of the right side of the ophthalmic microscope body 6.
The second optical member 512 is disposed on the second optical axis O-502, and the light passing through the second optical member 512 is directed downward by the second reflecting member 513 (the second optical member O-502 is Reflected). This reflected light path is shown in the third optical axis direction O-503.

In the present embodiment, the objective lens 2 is cut out so as to have a cut surface substantially parallel to the optical axis O-400, as shown in FIG.
In the present embodiment, the OCT measurement optical system objective lens 507 is accommodated in the cutout portion.
The light guided in the third optical axis direction O- 503 is focused by the OCT measurement optical system objective lens 507 at a predetermined position on the eye 81 side.
In this embodiment, as shown in FIGS. 7, 8 and 9, the front focal position (first in-focus point U1) of the objective lens 2 is in front of the subject eye 81, and the first objective lens 2 When the objective auxiliary lens 82 is set to the in-focus point U1 side of the lens, the front lens 14 is released (see FIGS. 7, 8 and 10A), and conversely, the first in-focus point of the objective lens 2 is When the objective auxiliary lens 82 is released on the U1 side, the front lens 14 is set (see FIGS. 9 and 10B).

As described above, the optical axis O-503 of the OCT measurement optical system 500 passes through the OCT measurement optical system objective lens 507, and the optical axis O-503 of the OCT measurement optical system 500 is the optical axis O of the observation optical system 400. It is separated from -400.
Therefore, the OCT measurement optical system 500 and the observation optical system 400 are independent of each other.

FIG. 14 is a drawing schematically showing an optical configuration of the OCT main body unit 10 used in the microscope 1 of the present embodiment.
As shown in FIG. 14, the OCT main unit 10 splits the light L0 emitted from the OCT light source unit 1001 into the measurement light LS and the reference light LR, and the interference of the measurement light LS and the reference light LR that have passed through different light paths. Constitutes an interferometer for detecting
The OCT light source unit 1001 is configured to include a wavelength scanning (wavelength sweeping) light source capable of scanning (sweeping) the wavelength of outgoing light, as in a general swept source type OCT apparatus. The OCT light source unit 1001 temporally changes the output wavelength at a near infrared wavelength that can not be viewed by the human eye. The light output from the OCT light source unit 1001 is indicated by a symbol L0.

The light L0 output from the OCT light source unit 1001 is guided by the optical fiber 1002 to the polarization controller 1003 and its polarization state is adjusted. The polarization controller 1003 adjusts the polarization state of the light L0 guided in the optical fiber 1002, for example, by externally applying stress to the looped optical fiber 1002.
The light L0 whose polarization state has been adjusted by the polarization controller 1003 is guided to the fiber coupler 1005 by the optical fiber 1004, and is split into the measurement light LS and the reference light LR.

As shown in FIG. 14, the reference light LR is guided to the collimator 1007 by the optical fiber 1006 to be a parallel luminous flux. The reference light LR, which has become a parallel light flux, is guided to the corner cube 1010 via the optical path length correction member 1008 and the dispersion compensation member 1009. The optical path length correction member 1008 acts as a delay unit for matching the optical path lengths (optical distance) of the reference light LR and the measurement light LS. The dispersion compensation member 1009 acts as a dispersion compensation unit for matching the dispersion characteristics of the reference light LR and the measurement light LS.
The corner cube 1010 turns back the traveling direction of the reference light LR which has been collimated by the collimator 1007 in the opposite direction. The optical path of the reference light LR incident on the corner cube 1010 and the optical path of the reference light LR emitted from the corner cube 1010 are parallel. The corner cube 1010 is movable in a direction along the incident light path and the outgoing light path of the reference light LR. By this movement, the length of the optical path (reference optical path) of the reference light LR is changed.

As shown in FIG. 14, the reference light LR passing through the corner cube 1010 passes through the dispersion compensating member 1009 and the optical path length correcting member 1008, is converted from parallel light into focused light by the collimator 1011, and enters the optical fiber 1012. The polarization state of the reference light LR is adjusted by being guided to the polarization controller 1013.
The polarization controller 1013 has, for example, the same configuration as that of the polarization controller 1003. The reference light LR whose polarization state has been adjusted by the polarization controller 1013 is guided to the attenuator 1015 by the optical fiber 1014, and the light amount is adjusted under the control of the arithmetic control unit 12. The reference light LR whose light amount is adjusted by the attenuator 1015 is guided to the fiber coupler 1017 by the optical fiber 1016.

  The measurement light LS generated by the fiber coupler 1005 is guided by the optical fiber 501 to the collimator lens 502. As shown in FIGS. 10A and 10B, the measurement light incident on the collimating lens 502 has galvano mirrors 503a and 503b, a first optical member 510, a first reflecting member 511, and a second optical member 512. The subject's eye 81 is irradiated via the second reflection member 513. The measurement light is reflected and scattered at various depth positions of the eye 81 to be examined. The backscattered light of the measurement light travels in the same direction as the forward path in the reverse direction by the subject eye 81 and is guided to the fiber coupler 1005 as shown in FIG. 14 and then to the fiber coupler 1017 via the optical fiber 1018. To reach.

  The fiber coupler 1017 combines (interferences) the measurement light LS incident through the optical fiber 1018 and the reference light (LR) incident through the optical fiber 1016 to generate interference light. The fiber coupler 1017 branches the interference light of the measurement light LS and the reference light LR at a predetermined branching ratio (for example, 50:50) to generate a pair of interference lights LC. The pair of interference lights LC emitted from the fiber coupler 1017 are guided to the detector 1021 by two optical fibers 1019 and 1020 respectively.

  The detector 1021 is, for example, a balanced photodiode (hereinafter referred to as “BPD”) that has a pair of photodetectors that respectively detect a pair of interference lights LC and that outputs a difference between detection results. The detector 1021 sends the detection result (detection signal) to the arithmetic control unit 12. For example, the arithmetic control unit 12 forms a cross-sectional image by performing Fourier transform or the like on the spectral distribution based on the detection result obtained by the detector 1021 for each series of wavelength scans (for each A line). The arithmetic control unit 12 causes the display unit 13 to display the formed image.

  In this embodiment, a Michelson-type interferometer is employed, but any type of interferometer such as a Mach-Zehnder-type can be applied.

4. Shape of Objective Lens FIG. 15 is an explanatory view showing another specific example of the objective lens 2 for the observation optical system and the OCT measurement optical system objective lens 507. FIG. 15A shows an objective lens 2 for an observation optical system in which a circular convex lens is cut off by a curved surface parallel to the optical axis (a partial circle in plan view shape) and a circular OCT measurement optical system objective arranged in the cut portion FIG. 15B is a view showing a lens 507 (convex lens), and FIG. 15B is disposed on the objective lens 2 for the observation optical system and the cut-out portion in plan view in which the circular convex lens is cut off in a plane parallel to the optical axis. It is a figure which shows OCT measurement optical system objective lens 507 (convex lens) whose planar view is a rectangle.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to above-described embodiment, The change of the conditions which do not deviate from a summary, etc. are all the application scopes of this invention.

The reference numerals used in FIGS. 1 to 15 indicate the following.
1: Ophthalmic microscope 2: Objective lens 5: OCT apparatus 6: Ophthalmic microscope main body 7: OCT function expansion unit 9: Illumination light source 10: OCT unit 12: Arithmetic control unit 13: Display part 14: Head lens 81: Subject Optometry 82: objective auxiliary lens 300: illumination optical system 301: optical fiber 302: exit light aperture 303: condenser lens 304: illumination field aperture 305: collimating lens 306: reflection mirror 400: observation optical system 400L: observation optical system for left eye 400R: right-eye observation optical system 401: variable magnification lens system 402: beam splitter 403: imaging lens 404: image erecting prism 405: eye width adjusting prism 406: field stop 407: eyepiece 500: OCT measuring optical system 501 : Optical fiber 502: Collimate lens 503: Scanning function part 503 : Galvano mirror 503b: Galvano mirror 507: OCT measuring optical system objective lens 510: first optical member 511: first reflecting member 512: second optical member 513: second reflecting member 1001: OCT light source unit 1002: optical fiber 1003: Polarization controller 1004: optical fiber 1005: fiber coupler 1006: optical fiber 1007: collimator 1008: optical path length correction member 1009: dispersion compensation member 1010: corner cube 1011: collimator 1012: optical fiber 1013: polarization controller 1014: optical fiber 1015 Attenuator 1016: optical fiber 1017: fiber coupler 1018: optical fiber 1019: optical fiber 1020: optical fiber 1021: detector 1100: photographing optical system 1101: connection Lens 1102: Reflection mirror 1103: Television camera L0: Light LC: Interference light LR: Reference light LS: Measurement light O-300: Optical axis of illumination optical system O-400: Optical axis of observation optical system O-400L: Left eye Axis O-400R of the observation optical system for lenses: optical axis O-500 of the observation optical system for right eye: optical axis O-501 of the OCT measurement optical system: first optical axis O-502: second optical axis O −503: third optical axis U1: first in-focus point U2: second in-focus point U3: third in-focus point

Claims (9)

In an ophthalmologic microscope having a function of switching between an anterior segment observation and a posterior segment observation of an eye to be examined,
An observation optical system having a first focal point in front of the subject's eye;
A lens that can be set at or released from the subject eye side of the objective lens in the observation optical system or at a position opposite to the subject eye, and the in-focus point when set is an anterior eye of the subject eye An objective auxiliary lens set to a second in-focus position,
A lens that can be set at or released from the subject eye position with respect to the first in-focus point, and the in-focus point through the lens of the subject eye when set is the back eye of the subject eye A front lens set to a third in-focus position,
Equipped with
In the anterior segment observation, the objective auxiliary lens is set and the front lens is released without changing the positional relationship between the objective lens and the eye to be examined.
In the rear eye observation, the front lens is set and the objective auxiliary lens is released without changing the positional relationship between the objective lens and the eye to be examined.
An ophthalmic microscope characterized by.   The ophthalmic microscope according to claim 1, further comprising an OCT measuring optical system, wherein the OCT measuring optical system comprises an OCT measuring optical system objective lens. The OCT measurement optical system further includes a first optical member for guiding light from an OCT light source in a first optical axis direction;
A first reflection member for guiding light guided in the first optical axis direction to a second optical axis direction substantially orthogonal to the first optical axis direction;
A second optical member relaying the light guided in the second optical axis direction;
A second reflecting member for guiding light relayed by the second optical member in a third optical axis direction substantially orthogonal to the second optical axis direction;
Have
The OCT measurement optical system objective lens is disposed on the third optical axis direction, and irradiates the light guided in the third optical axis direction to a predetermined part of the eye. The ophthalmic microscope according to claim 2. The observation optical system includes the objective lens having a shape in which a part of a circular lens is cut off,
The OCT measurement optical system has the OCT measurement optical system objective lens disposed in the ablated part of the objective lens, and has a first focal point in front of the eye to be examined and an OCT measurement A light path of light is configured to pass through the objective lens;
When the objective auxiliary lens is set and the front lens is released, the in-focus point is set to a second in-focus position, which is the anterior eye position of the subject eye, and the OCT measurement of the anterior eye portion is performed. ,
When the pre-lens is set and the objective auxiliary lens is released, the in-focus point is set to a third in-focus point, which is the back eye position of the subject eye, and the OCT measurement of the back eye is performed ,
The ophthalmic microscope according to claim 2 or 3, wherein   The system according to any one of claims 1 to 4, further comprising a mechanism for releasing the front lens when the objective auxiliary lens is set, and releasing the objective auxiliary lens when the front lens is set. The ophthalmic microscope according to Item.   The ophthalmic microscope according to any one of claims 1 to 5, wherein the objective auxiliary lens is a concave lens.   The ophthalmic microscope according to any one of claims 1 to 6, wherein a plurality of types of the front lenses are provided, and a plurality of types of the objective auxiliary lenses corresponding to the respective front lenses are provided. By having an anterior lens that can be set or released on the optical path of the observation optical system, the OCT microscope can be used as the main body of an ophthalmic microscope that can switch between anterior and posterior eye observation of an eye to be examined. In the OCT function expansion unit to be added,
A replacement objective lens for replacing an objective lens of an observation optical system of the microscope main body;
The replacement objective lens has a shape in which a part of a circular lens is cut off,
An OCT measurement optical system objective lens is provided at the cut portion of the replacement objective lens,
The observation optical system in which the objective lens is replaced with the replacement objective lens, and the OCT measurement optical system have a first focal point in front of the subject's eye.
A lens which can be set at the eye side of the subject or the opposite side to the eye to be examined with respect to the replacement objective lens and the OCT measurement optical system objective lens, or can be released from the position. An objective auxiliary lens for setting the lens position to a second focal point which is the anterior eye position of the subject eye;
When the front lens is set at a position closer to the subject's eye than the first in-focus point, a third in-focus point where the in-focus point of the subject's eye via the lens is the back eye position of the subject's eye Set to focus
During the anterior segment observation, the objective auxiliary lens is set and the anterior lens is released,
During the rear eye observation, the front lens is set and the objective auxiliary lens is released.
The front eye part observation and the back eye part observation can be switched by the observation optical system and the OCT measurement optical system without changing the positional relationship between the objective lens and the eye to be examined. OCT function expansion unit. The OCT measurement optical system is
A first optical member for guiding light from an OCT light source in a first optical axis direction;
A first reflection member for guiding light guided in the first optical axis direction to a second optical axis direction substantially orthogonal to the first optical axis direction;
A second optical member relaying the light guided in the second optical axis direction;
A second reflecting member for guiding light relayed by the second optical member in a third optical axis direction substantially orthogonal to the second optical axis direction;
And have
The OCT measurement optical system objective lens is disposed on the third optical axis direction, and irradiates the light guided in the third optical axis direction to a predetermined part of the eye to be examined. Item 8. The OCT function expansion unit according to Item 7.