JPH09131316A - Ophthalmologic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform alignment simply by precisely knowing the relative position of an eye to be examined and an ophthalmologic device, distinguishing between an index image and a flare. SOLUTION: In the case that there is displacement in the relative position between an eye to be examined E and an eyeground camera, with the face vertical to the optical axis, the observed image is projected on a television monitor 26, being displaced. The examiner shifts an eyeground camera within the face vertical to the optical axis 01, using a control lever, and the index image P2' projected within an observation image is shifted in the direction of a character P2'' flickering in the same cycles as the index image P2' so that the two index images P1' and P2'' may appear in symmetrical position. Next, the examiner shifts an eyeground camera in optical direction 01 so that the two index images P1' and P2'' may be seen clearly, in the observation image on a television monitor 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus having index projection means for projecting an alignment index onto the eye to facilitate alignment between the eye and the eye apparatus.

[0002]

2. Description of the Related Art Conventionally, when photographing a fundus photograph or the like, it is necessary to perform relative alignment between the eye to be inspected and the fundus camera, and particularly, the working distance between the eye to be inspected and the fundus camera is finely adjusted. ing. Therefore, if this adjustment is improper, the illumination luminous flux is not effectively incident, flare is mixed, and the image quality deteriorates. Also, if the optical axes of the eye to be inspected and the fundus camera do not match, The optometry cannot be illuminated effectively, and flare is mixed in, resulting in a blurred image. For this,
Alignment work performed by the examiner observing the fundus of the subject with a finder optical system or a monitor of a TV camera that converts an infrared image into a visible image requires skill and requires considerable time. There is a drawback that it costs.

To address this problem, the present applicant has filed Japanese Patent Application Laid-Open No. 53-
In Japanese Patent No. 49890, light fluxes from a plurality of index light sources symmetrically arranged around the optical axis are projected onto a corneal surface of an eye to be examined through an objective lens, and the reflected light flux is imaged again through the objective lens. Proposes an ophthalmologic apparatus that allows the image of the index light source and the fundus reflection image to form an image within a conjugate plane when the working distance between the eye to be inspected and the objective lens becomes appropriate.

According to this ophthalmologic apparatus, while observing a plurality of index images reflected from the corneal surface of the subject's eye, the ophthalmologic apparatus is moved so that these index images are clear and symmetrical about the optical axis. This makes it possible to easily perform delicate alignment.

[0005]

However, in the above-mentioned conventional example, there is a problem that the index image is blurred when the alignment is largely deviated and cannot be distinguished from the flare. Kaisho 62-281
In JP 922, a plurality of index light sources are symmetrically arranged around the optical axis, and the light intensity of these light sources is vibrated at a predetermined frequency so that the flare and the index image can be easily distinguished. And by changing these light intensities at different periods, at least 1
We propose an ophthalmologic apparatus that can know the relative position of the eye to be inspected and the ophthalmic apparatus in a plane perpendicular to the optical axis if two index images can be confirmed.

The present invention is a further improvement of the ophthalmologic apparatus disclosed in Japanese Patent Laid-Open No. 62-281922, in which a reference index image corresponding to a plurality of index images is provided on the display image surface so that the index image on the screen is more accurate. It can be easily and easily identified.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an ophthalmologic apparatus capable of accurately knowing the relative positions of the eye to be inspected and the ophthalmologic apparatus by distinguishing the index image from the flare and performing alignment easily.

[0008]

An ophthalmologic apparatus according to a first aspect of the present invention for achieving the above object is an ophthalmologic apparatus having index projection means for projecting a plurality of alignment indexes onto an eye to be inspected. The indexes are different from each other, and the indexes corresponding to the plurality of alignment indexes are provided in or around the observation visual field.

An ophthalmologic apparatus according to a second aspect of the present invention is an ophthalmologic apparatus having index projection means for projecting a plurality of alignment indexes onto an eye to be inspected, wherein the plurality of alignment indexes are in a form in which they can be discriminated from each other, and an observation visual field Each of the indexes corresponding to the plurality of alignment indexes is provided in or around the index.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 shows a configuration diagram of the first embodiment,
The objective lens 1 is arranged so as to face the eye E to be inspected, and on the optical axis O1 behind the objective lens 1, a perforated mirror 2, a photographing diaphragm 3, a focus lens 4, an imaging lens 5, and a switching mirror 6 are provided. , The film surface 7 is arranged. In the reflection direction of the switching mirror 6, the film conjugate plane 8, the field lens 9, the mirror 10, the television relay lens 11, the CCD
Twelve image pickup planes are sequentially arranged, and these constitute an observation and photographing optical system.

Further, the optical axis O2 in the reflection direction of the perforated mirror 2
Lenses 13 and 14, a ring slit 15 having a ring-shaped opening, and a mirror 16 are sequentially arranged on the upper side, and a condenser lens 17, a strobe tube 18, a condenser lens 19, and visible light are arranged in the reflection direction of the mirror 16. A visible cut filter 20 having a characteristic of reflecting light and transmitting infrared light,
Halogen lamps 21, which are continuous lighting lights, are sequentially arranged, and an illumination optical system is configured by these.

Further, an emission end of a light guide 23a for guiding a light beam from the LED light source 22a is disposed on the front surface of the perforated mirror 2, and this emission end is used as an alignment index P1. The alignment index P1 is arranged off the optical axis O1, and the emission end of the light guide 23b for guiding the light flux from the LED light source 22b (not shown) is arranged at a position symmetrical to the alignment index P1 around the optical axis O1. This emission end is used as an alignment index P2, and these constitute an alignment index projection optical system.

The output of the CCD 12 is the image processing unit 2.
4, the output of the image processing unit 24 is connected to the television monitor 26, and the LED light source control unit 2
It is connected to the LED light sources 22a and 22b through 5.

Only the infrared light of the illumination light flux emitted from the halogen lamp 21 is wavelength-selected by the visible cut filter 20, and once focused on the strobe tube 18 via the condenser lens 19, the condenser lens 17, the mirror 16,
The fundus Er of the eye E is illuminated via the ring slit 15, the lens 14, the lens 13, the perforated mirror 2, and the objective lens 1. The illumination luminous flux is reflected by the fundus Er, passes through the objective lens 1, the hole portion of the perforated mirror 2, the photographing diaphragm 3, the focus lens 4, and the imaging lens 5, and is reflected by the switching mirror 6, and then on the film conjugate surface 8. It forms an image and also forms an image on the image pickup surface of the CCD 12 through the field lens 9, the mirror 10 and the television relay lens 11 to form a fundus reflection image.

On the other hand, the index light beams emitted from the alignment indexes P1 and P2 are projected onto the eye E through the objective lens 1. When the working distance between the eye E to be inspected and the fundus camera is proper, the index light flux reflected by the corneal surface of the eye E becomes parallel light, and passes through the same optical path as the fundus reflection light flux of the illumination light flux and the imaging surface of the CCD 12 Imaged on top and index images P1 'and P respectively
Form 2 '. The fundus reflection image and the index images P1 ′ and P2 ′ formed on the image pickup surface of the CCD 12 are displayed on the television monitor 26 via the image processing unit 24 to form an observation image.

Further, the LED light sources 22a and 22b are shown in FIG.
As shown in (a) and (b), the blinks are shifted by a half cycle from each other, and the alignment indexes P1 and P2 are also blinked at a half cycle from each other, and a signal indicating the blinking state is transmitted to the image processing unit 24. The image processing unit 24 synthesizes the index images P1 'and P2' which blink in the same cycle as the characters P1 "and P2" on the observed image and displays them on the television monitor 26.

Therefore, when there is a shift in the relative position between the eye E and the fundus camera in the plane perpendicular to the optical axis O1, the observation images as shown in FIGS. 3 (a) and 3 (b) are obtained. TV monitor 26
It is projected above. Here, the images on the television monitor 26 are alternately in the states (a) and (b).

The examiner moves the fundus camera in a plane perpendicular to the optical axis O1 by using an operation stick (not shown), and the index image P2 'shown in the observation image is indexed as shown in FIG. image
Move it in the direction of the blinking character P2 "in the same cycle as P2 'so that the two index images P1' and P2 'appear at symmetrical positions. Furthermore, the examiner uses the operating stick to set the optical axis. By moving the fundus camera in the O1 direction, two index images P1 ′ are displayed as in the observation image shown in FIG. 1 displayed on the television monitor 26.
, P2 ′ are clearly visible, which allows the eye E to be inspected and the fundus camera to be easily aligned.

When the alignment is completed in this way, the examiner pushes a photographing switch (not shown). As a result, the switching mirror 6 is retracted to the position shown by the dotted line in the figure, the strobe tube 18 emits light, and the emitted illumination light flux follows the same optical path as the illumination light flux emitted from the halogen lamp 21 described above. The fundus Er of the optometry E is illuminated. The reflected light flux from the fundus Er is imaged and recorded on the film surface 7 again via the objective lens 1, the photographing diaphragm 3, the focus lens 4, and the imaging lens 5.

In this embodiment, two alignment indexes are used.
I arranged P1 and P2 symmetrically around the optical axis O1.
For example, four markers may be arranged symmetrically in the vertical and horizontal directions, and four characters on the observed image may be arranged accordingly. Also, the blinking cycle of each index is shown in FIG.
The waveforms shown in (a) and (b) may be used.

Further, in the present embodiment, the character P1 "
, P2 "is image-synthesized outside the frame of the fundus image and is displayed on the television monitor 26. However, image synthesis is performed at a predetermined position within the frame of the fundus image, and the index images P1 'and P2' are calculated based on the position information. The characters P1 "and P2" may be moved so as to be used as an index for position information for peripheral imaging and stereoscopic imaging of the fundus.

FIG. 6 is a block diagram of the mydriasis type fundus camera of the second embodiment, and the same reference numerals as those in FIG. 1 represent the same members. A switching mirror 27 is provided in the reflection direction of the switching mirror 6, and in the reflection direction of the switching mirror 27, a lens support portion 29 that supports a field lens 28 that also serves as focus glass and an eyepiece lens 30 are arranged. The illumination optical system of the other observation and photographing optical system is configured in the same manner as in FIG.

The emitting end of the light guide 32a for guiding the light beam from the LED light source 31a is used as an alignment index P1. The alignment index P1 is arranged off the optical axis O1 and is arranged around the optical axis O1. At a position symmetrical with the index P1,
An emission end of a light guide 32b that guides a light beam from an LED light source 31b (not shown) is arranged, and this emission end serves as an alignment index P2, which constitutes an alignment index projection optical system.

An exit end of a light guide 33a for guiding a light beam from the LED light source 31a is arranged on the lens support portion 29,
It is used as the index S1. Also, the optical axis O1 of the lens support 29
On the other hand, the emission end of the light guide 33b that guides the luminous flux from the LED light source 31b is arranged at a position symmetrical to the index S1,
It is referred to as S2, and these constitute the index display section. The output of the LED light source control unit 34 is connected to the LED light sources 31a and 31b.

The LED light source 31a emits red light,
A light source that emits green light is used as the light source 31b, and the two alignment indexes can be distinguished by the difference in color. The LED light sources 31a and 31b emit light in intensity temporally as shown in FIG. 2 (a). Changes, and flashes and lights in the same cycle.

The illumination light flux reflected by the fundus Er of the eye E to be examined is reflected by the switching mirrors 6 and 27 through the optical path O1 as in the case of the first embodiment, and is focused on the field lens 28 to be reflected by the fundus. Form an image. On the other hand, the alignment index P
The index luminous fluxes emitted from P and P2 reach the field lens 28 through the same optical path O1 as in the first embodiment, and the index image P
1 ′ and P2 ′ are formed, and the examiner observes the fundus reflection image formed on the field lens 28 and these index images P1 ′ and P2 ′ through the eyepiece lens 30.

FIG. 7 shows an observation visual field when the examiner looks into the eyepiece lens 30, and when the indexes P1 and P2 are presented to the eye E to be examined, the field lens 28 is reflected by the fundus.
The index images S1 and S2 corresponding to the index images P1 'and P2' formed on the upper surface
Can be observed. Here, when the alignment between the eye E to be inspected and the fundus camera is proper, the index images P1 ′ and P2 ′ look clear and symmetrical, but when the alignment between the eye E to be inspected and the fundus camera is not proper. , Alignment index image P
If the positions of 1'and P2 'are deviated and one of the plurality of index images P1' and P2 'can be confirmed as in the case of the first embodiment, a fundus camera using an operation stick (not shown) is used. Optical axis O1
Can be confirmed by moving in the direction
Move in the direction of the index S1 or S2 corresponding to P2 'to display the index image
If both P1 'and P2' can be seen clearly, it means that proper alignment has been made.

In this embodiment, the positions of the indexes P1 and P2 that emit different colors in the direction of the optical axis O1 are the same, but the chromatic aberrations of the alignment index projection optical system and the observation / photographing optical system are taken into consideration. When proper alignment between the optometry E and the fundus camera is obtained, the index image is formed on the field lens 28.
The optical axes O1 should be aligned with each other so that P1 'and P2' are properly focused.
The position in the direction may be changed. Furthermore, although the LED light sources 31a and 31b have the same blinking cycle in this embodiment, they may blink at different cycles.

FIG. 8 is a block diagram of the index projection means for projecting the alignment index of the third embodiment, and the same reference numerals as those in FIG. 1 represent the same members. A beam splitter 35 is provided behind the photographing diaphragm 3 arranged on the optical axis O1 to divide the optical path into two. Beam splitter 35
The index plate 3 having the mirror 36, the index projection lens 37, and the alignment indexes P3 and P4 in the reflection direction of the reflection surface R of
8. The LED light source 39 for index projection is sequentially arranged. The LED light source 39 is connected to the output of an LED light source control unit (not shown) so that the LED light source 39 blinks periodically.

9 and 10 are front views of the index plate 38. FIG. 9 shows two indexes P3 and P4 due to the difference in geometrical shape.
10 can be distinguished from each other. In FIG. 10, the two indexes P5 and P6 can be distinguished by changing the size of the indexes. Furthermore, in this embodiment, on a television monitor (not shown) or in the vicinity thereof, it is possible to display index images S3, S4 or S5, S6 corresponding to the indexes P3, P4 or P5, P6. Also in the device, the above-mentioned first
Also, the same effect as that of the ophthalmologic apparatus of the second embodiment can be obtained.

[0031]

As described above, in the ophthalmologic apparatus according to the first aspect of the present invention, the plurality of alignment indexes projected on the eye to be examined are different from each other, and the indexes corresponding to the respective alignment indexes are provided in the observation visual field. This makes it possible to easily distinguish between the flare and the index image regardless of the experience of the examiner, and easily know the relative position between the eye to be inspected and the ophthalmologic apparatus,
Proper alignment can be performed.

In the ophthalmologic apparatus according to the second aspect of the present invention, the plurality of alignment indexes projected on the eye to be inspected are in a form in which they can be discriminated from each other, and the indexes corresponding to the respective alignment indexes are provided in the observation visual field. The flare and the index image can be easily distinguished regardless of the experience of the examiner, and the relative position between the eye to be inspected and the ophthalmologic apparatus can be easily known and proper alignment can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a graph showing the change over time in the emission intensity of the LED light source.

FIG. 3 is an explanatory diagram of an observed image when the alignment is deviated.

FIG. 4 is an explanatory diagram of an observation image when alignment is obtained.

FIG. 5 is a graph showing the change over time in the emission intensity of the LED light source.

FIG. 6 is a configuration diagram of a second embodiment.

FIG. 7 is an explanatory diagram of an observation visual field when alignment is obtained.

FIG. 8 is a configuration diagram of an alignment index projection means of a third embodiment.

FIG. 9 is a front view of an alignment indicator plate.

FIG. 10 is a front view of an alignment indicator plate.

[Explanation of symbols]

 3 Perforated mirror 6, 27 Switching mirror 7 Film surface 12 CCD 18 Strobe tube 20 Filter 21 Halogen lamp 22a, 31a, 39 LED light source 23a, 32a, 33a Light guide 24 Image processing unit 25, 34 LED light source control unit 26 TV monitor 35 beam splitter 38 index plate

Claims (8)

[Claims] 1. An ophthalmologic apparatus having index projection means for projecting a plurality of alignment indexes onto an eye to be examined, wherein the plurality of alignment indexes are different from each other and the plurality of alignment indexes are provided in or around an observation visual field. An ophthalmologic apparatus provided with respective indexes corresponding to. 2. The brightness of the plurality of alignment indexes is changed so as to be different from each other.
The ophthalmic device according to. 3. The ophthalmologic apparatus according to claim 1, wherein the plurality of alignment indexes are reduced by different periods or phases. 4. The ophthalmologic apparatus according to claim 1, wherein the plurality of alignment indexes have different colors. 5. The ophthalmologic apparatus according to claim 1, wherein the plurality of alignment indexes have different shapes or sizes. 6. The ophthalmologic apparatus according to claim 1, wherein the index corresponding to the plurality of alignment indexes can be presented at a predetermined position in or around the observation visual field. 7. An ophthalmologic apparatus having index projection means for projecting a plurality of alignment indexes onto an eye to be inspected, wherein the plurality of alignment indexes are in a form in which they can be discriminated from each other, and the plurality of alignment indexes are provided in or around an observation visual field. An ophthalmologic apparatus, which is provided with respective indexes corresponding to the alignment indexes of. 8. The ophthalmologic apparatus according to claim 7, wherein the index corresponding to the plurality of alignment indexes can be presented at a predetermined position in or around the observation visual field.