JPH09271464A - Ophthalmological device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of adjusting the presenting position of a fixed vision target for guiding an eye to be tested to a desired position even when the photographing of a left eye and the photographing of a right eye are switched. SOLUTION: The fixed vision lamps 37 and 38 of a fixed vision target projection system are position-adjustable within a plane almost conjugate with an eye ground Er respectively by a left side fixed vision adjustment lever 10 and a right side fixed vision lamp adjustment lever 11. At the time of photographing, a tester operates the lever 10 or 11 corresponding to the eye E to be tested on a side to perform photographing and the eye ground Er is guided to a desired photographing position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus used in an ophthalmology clinic or the like.

[0002]

[Prior art]

(1) Conventionally, in an ophthalmologic apparatus such as a fundus camera, in order to guide the eye to be inspected to a desired imaging region, a movable point light source is provided outside the housing, and the point light source is fixed to the subject. While moving while changing the direction of the line of sight so that the target site is within the field of view of the fundus camera, or an index that is optically projected to an arbitrary position is obtained through an objective lens provided inside the housing. By making the examiner fixate his eyes, the target site is guided within the imaging field of view.

(2) Further, in the case of a fundus camera used for group medical examinations and the like, since the region to be imaged is determined to some extent and a large number of subjects are imaged per day, the left and right eyes of the subject are examined. In order to simplify the operation of moving the fixation target when capturing the image, the fixation target arranged with the optical axis interposed as in Japanese Patent Publication No. 3-48810 is interlocked with the lateral movement of the housing of the fundus camera. Then, a method of switching is proposed.

[0004]

However, in the above-mentioned conventional example (1), when the photographing of the left eye and the photographing of the right eye are switched,
It is necessary to adjust the presentation position of the fixation target and guide the eye to be examined to a desired position again, which causes a problem of poor operability.

Further, in the above-mentioned conventional example (2), it is difficult to adjust the projection position of the fixation target, and it is not always the case that the image is taken at the site desired by the examiner.

An object of the present invention is to improve such a problem and to present a fixation target presenting position for guiding the eye to a desired position even if the left eye and the right eye of the subject are switched. It is an object of the present invention to provide an ophthalmologic apparatus capable of adjusting a fixation target by a simple operation when there is no need to readjust the eye and further adjustment is necessary.

[0007]

An ophthalmologic apparatus according to a first aspect of the present invention for achieving the above object comprises an optical system for observing and photographing an eye to be inspected, adjusting means for aligning the optical system with the eye to be inspected, and the adjustment. Detecting means for detecting which of the left and right eyes of the subject the optical system is adjusted by means, a plurality of fixation targets that can be presented at any position, and an output of the detecting means. A control means for selecting the fixation target is provided.

In the ophthalmologic apparatus according to the second aspect of the present invention, an optical system for observing and photographing the eye to be inspected, adjusting means for aligning the optical system with the eye to be inspected, and the optical system by the adjusting means are provided for the left and right eyes of the subject. Detection means for detecting which of the following is adjusted,
A fixation target that can be presented at an arbitrary position, a recording unit that records the presentation position of the fixation target, and the fixation target is presented at the position recorded in the recording unit in association with the output of the detection unit. A control means is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a perspective view of a non-mydriasis fundus camera according to the first embodiment, in which a face support portion 2 is fixed to a subject side of a base 1, and a position of the face support portion 2 is adjusted in the front, rear, left, right, and up and down directions. A stage unit 3 capable of performing the above is attached. An optical system 4 of the fundus camera body is placed on the stage unit 3, and a camera unit 5 equipped with a photographic film is attached to the optical system 4. Further, inside the base 1, there is provided a left / right detection unit 6 including a micro switch for detecting the left / right position of the stage unit 3.

On the examiner side of the stage unit 3, an operation rod including a position adjusting lever 7 and a photographing switch 8 for aligning the eye to be inspected with the optical system 4 of the fundus camera body, an anterior segment Ep and a fundus Er. An anterior ocular segment / fundus changeover switch 9 for switching between is selected.

On the examiner side of the optical system 4 of the fundus camera body,
A left fixation adjusting lever 10 for adjusting the position of the fixation lamp projected on the left eye of the subject and a right fixation lamp adjusting lever 11 for adjusting the position of the fixation lamp projected on the right eye of the subject. It is provided.

FIG. 2 is a block diagram of the optical system 4, showing an eye E to be inspected.
On the front optical path O1, an objective lens 12, an anterior ocular segment observation optical system 13 that can be inserted into and removed from the optical path O1 and is inserted on the optical path O1 when observing the anterior ocular segment, a perforated mirror 14 having a central opening,
A focusing lens 15, a photographing lens 16, which is movable in the optical path O1 direction, a flip-up mirror 17 which is flipped upward during photographing, and a film 18 used during photographing are sequentially arranged. The anterior ocular segment observing optical system 13 includes an eye E to be inspected.
A lens 19 and a mark index 20 are provided from the side, and the mark index 20 is a transparent plate on which a mark 20a indicating a pupil diameter necessary for fundus photography is drawn as shown in FIG. It is arranged on the image plane F.

On the optical path O2 in the reflection direction of the perforated mirror 14, from the side of the perforated mirror 14, the corneal baffle 21, the relay lenses 22, 23, the crystalline lens baffle 24, the ring slit 25 having an annular opening, the condenser lens 26, Photographic light source 27 composed of a xenon tube or the like, condenser lens 2
8, an infrared filter 29 that transmits infrared light, an illumination light source 30 such as a halogen lamp, and a concave reflecting mirror 31 are sequentially arranged to configure a photographing and observation illumination system.

In the vicinity of the objective lens 12, an infrared light source 32 for illuminating the anterior ocular segment Ep of the subject's eye E from an oblique direction when observing the anterior ocular segment is provided. Flip-up mirror 1
On the optical path O3 in the reflection direction of 7, the field lens 33,
A half mirror 34, a lens 35, a half mirror 36, and a fixation lamp 37 for guiding the left eye of the subject are provided. Further, a fixation lamp 38 for guiding the right eye of the subject is provided in the reflection direction of the half mirror 36, and a fixation target projection system is configured.

The positions of the fixation lights 37 and 38 can be adjusted in a plane substantially conjugate with the fundus Er by the left fixation light adjustment lever 10 and the right fixation light adjustment lever 11, respectively. By operating the adjusting levers 10 and 11, the fundus of the eye E to be examined can be guided to a desired imaging site.

A television lens 39 and an infrared television camera 40 are provided on the optical path O4 in the reflection direction of the half mirror 34, and the output of the infrared television camera 40 is connected to a television monitor 41.

When observing the anterior segment, the anterior segment of the eye E to be examined.
Ep, the image plane F of the anterior ocular segment observation optical system 13, the image plane F ′ near the field lens 33, and the image pickup plane F ″ of the infrared television camera 40 are substantially conjugate with each other, and when observing the fundus. The fundus Er of the eye E to be inspected, an image plane F ′ near the field lens 33, an imaging plane F ″ of the infrared television camera 40, and the fixation lamp 3
7 and 38 are configured to have a substantially conjugate relationship.

Further, a function controller 42 for controlling the electrical operation of the fundus camera is provided, and the function controller 42 includes
A left / right detection unit 6 provided on the base 1, a photographing switch 8 provided on the stage unit 3, and an anterior segment / fundus changeover switch 9 are connected. Then, the function control unit 42 responds to the output of the connected switch by the anterior segment observation optical system 13,
Flip-up mirror 17, photographing light source 27, infrared light source 3
2. The fixation lamps 37 and 38 are controlled by a driving means (not shown).

The procedure for photographing the fundus in the above-mentioned configuration will be described. First, as preparation for photographing the fundus Er of the eye E,
Rough alignment between the eye E and the optical system 4 of the fundus camera body is performed. The subject is seated in front of the objective lens 12, and the face of the subject is fixed to the face support portion 2 so that the eye E and the objective lens 12 face each other. The stage unit 3 is adjusted by the position adjusting lever 7, and the optical system 4 of the fundus camera main body is adjusted to the left eye of the subject.

The anterior ocular segment of the subject's eye E illuminated by the infrared illuminating light source 32 is aerial imaged on the image plane F near the anterior ocular segment observing optical system 12 by the objective lens 12 and the anterior ocular segment observing optical system 13. Then, an image is formed again on the image plane F ′ in the vicinity of the field lens 33 via the perforated mirror 14, the focusing lens 15, the photographing lens 16, and the flip-up mirror 17. The anterior segment image Ep ′ of the eye E to be inspected is formed on the television monitor 41 by the half mirror 34 and the television lens 39 on the imaging surface F ″ of the infrared television camera 40.
Is displayed. At this time, the anterior ocular segment image Ep 'of the eye E to be examined is combined with the mark 20a' of the mark index 20, and it is possible to observe whether or not the pupil diameter is a pupil diameter required for fundus imaging.

When the rough alignment for the eye E to be inspected is completed, the anterior segment / fundus changeover switch 9 is used to switch to the fundus observation mode. The output of the anterior segment / fundus changeover switch 9 is transmitted to the function control unit 42, the infrared illumination light source 32 is dimmed, the anterior segment observation optical system 13 is retracted from the optical path O1, and the left eye is guided. The fixation lamp 37 for lighting is turned on, and the fixation lamp 38 is dimmed. When the illumination light source 30 is turned on, the light flux from the illumination light source 30 passes through the optical path O2 and is reflected by the perforated mirror 14 to illuminate the fundus Er of the eye E to be examined. The reflected light from the fundus Er forms an image on the imaging surface F ″ of the infrared TV camera 40 via the optical paths O1, O3, and O4, and the TV monitor 4
The fundus image Er ′ is output on the display 1.

FIG. 4 shows a television monitor 4 during fundus observation.
It is an explanatory view on 1. In this state, the examiner performs precise alignment between the eye E and the optical system 4, and the basis of the examinee's gaze at that time is provided at a position substantially conjugate with the fundus Er behind the half mirror 36. It is the fixed fixation lamp 37.

The luminous flux of the fixation lamp 37 is the field lens 33.
An image is once formed on an image plane F ′ in the vicinity, and a part of the image is reflected in the returning direction by the field lens 33, and the half mirror 3
4. The image is formed on the image pickup surface F ″ of the infrared television camera 40 through the television lens 39, and the television monitor 4 is used as an index image 37 ′.
It is displayed by being combined with the fundus image Er 'on the upper side. Further, the light flux transmitted through the field lens 33 is reflected by the flip-up mirror 17, is visually recognized by the eye E to be inspected through the optical path O1, and serves as a basis for the subject's gaze. The examiner operates the left fixation adjustment lever 10 to adjust the projection position of the fixation lamp 37 and guide the fundus Er to a desired imaging site.

The examiner performs alignment while observing the fundus image Er 'on the television monitor 41, and moves the focusing lens 15 by a driving mechanism (not shown) to perform a focusing operation. Then, when the photographing switch 8 is pressed, the output of the photographing switch 8 is transmitted to the function control section 42, the flip-up mirror 17 is retracted to the position shown by the broken line by the driving means (not shown), and the photographing light source 27 is emitted. The luminous flux of the photographing light source 27 passes through the optical path O2 and is reflected by the perforated mirror 14 to reach the fundus Er of the eye E to be examined. The reflected light from the fundus Er is imaged on the film 18 via the optical path O1, and the fundus Er of the eye E is photographed.

Next, in order to observe and photograph the right eye of the subject, the examiner operates the position adjusting lever 7 to move the optical system 4 of the fundus camera body in the left-right direction. The movement of the optical system 4 is detected by the left and right detector 6, the anterior segment observation optical system 13 is inserted into the optical path O1 by the function controller 42, the infrared illumination light source 32 is turned on, and the same procedure as for the left eye is performed. Then, rough alignment is performed between the eye E to be inspected and the optical system 4 of the fundus camera body.

When the rough alignment with respect to the eye E to be inspected is completed, the anterior segment / fundus changeover switch 9 switches to the fundus observation mode. The output of the anterior segment / fundus changeover switch 9 is transmitted to the function controller 42, the infrared illumination light source 32 is dimmed, the anterior segment observation optical system 13 is retracted from the optical path O1, and the right eye is guided. The eye fixation lamp 38 is turned on, the eye fixation lamp 37 is dimmed, and the fundus Er of the eye E to be examined is imaged in the same procedure as the left eye.

Here, once the projection positions of the fixation lamp 37 and the fixation lamp 38 are adjusted, the left fixation adjusting lever 10,
Since it is held until the right fixation lamp adjusting lever 11 is operated, the operation of the right fixation lamp adjusting lever 11 can be omitted and the eye to be inspected when repeatedly photographing a certain portion to a certain extent. When the desired position is changed due to the individual difference or the discovery of an eye disease, the examiner can guide the eye E to the desired position by slightly adjusting the right fixation lamp adjustment lever 11 again.

Further, in the first embodiment, the internal fixation lamps 37 and 38 projected through the objective lens 12 are used, but a plurality of external fixation targets provided outside the optical system 4 are used. Also has the same effect.

FIG. 5 is a perspective view of a non-mydriasis fundus camera in the second embodiment, in which an optical system 43 is provided instead of the optical system 4 described in the first embodiment, and the left fixation control lever 10 is provided. Instead of the right fixation lamp adjustment lever 11, a fixation target adjustment lever 44 is provided. FIG. 6 is a block diagram of the optical system 43 of the non-mydriasis fundus camera in the second embodiment, and the portions with the same numbers as those in the first embodiment have the same functions as those described in the first embodiment. It has a function.

A field lens 33, a half mirror 34, a lens 35, a liquid crystal shutter 45, and a fixation light source 46 are provided on the optical path O3 in the reflection direction of the flip-up mirror 17 to form a fixation target projection system. There is. Liquid crystal shutter 4
5 can form an opening portion A and a large number of light shielding portions B as shown in FIG.
Is provided at a position substantially conjugate with. The function control unit 42 includes
A lever position detection unit 47 provided near the fixation target adjustment lever 44 for detecting the position of the fixation target adjustment lever 44, and a position recording unit 48 for recording the positions of the opening A and the light shielding unit B of the liquid crystal shutter 45 are connected. Has been done.

When the fundus is photographed, the optical system 43 of the non-mydriasis camera main body is adjusted to the left eye of the subject, and the rough between the subject's eye E and the optical system 43 is set as in the first embodiment. Perform alignment. When the rough alignment for the eye E to be inspected is completed, the anterior ocular segment / fundus changeover switch 9 switches to the fundus observation mode. The output of the anterior segment / fundus changeover switch 9 is transmitted to the function control unit 42, the infrared illumination light source 32 is dimmed, the anterior segment observation optical system 13 is retracted from the optical path O1,
The liquid crystal shutter 45 is formed with an opening A for guiding the left eye and a large number of light shields B.

By controlling the positions of the opening A and the plurality of light-shielding parts B by the function control part 42, the eye E to be examined E
It is possible to adjust the position of the fixation target projected on the screen. The opening A and the light shield B formed here are reproductions of the state when the left eye was previously photographed, and are recorded in the position recording unit 48.

The examiner will perform precise alignment between the eye E to be inspected and the optical system 43 as in the first embodiment.
At this time, the subject's gaze is based on the fixation target composed of the opening A formed in the liquid crystal shutter 45 and the fixation light source 46. Similar to the first embodiment, this fixation target is displayed by being combined with the fundus image Er ′ on the television monitor 41 and is visually recognized by the subject.

Here, when the fixation target adjusting lever 44 is operated, the position of the fixation target adjusting lever 44 is detected by the lever position detecting section 47, and its output is transmitted to the function control section 42, and the function control section 42 is detected. The opening A and the light shield B of the liquid crystal shutter 45 are changed. The examiner operates the fixation target adjustment lever 44 to adjust the projection position of the fixation target and guide the fundus of the eye E to be inspected to a desired imaging site.

After completing the alignment and focusing,
When the photographing switch 8 is pressed, as in the first embodiment, the fundus Er
Is photographed, and the positions of the opening A and the light shielding portion B of the liquid crystal shutter 45 at the time of photographing are recorded in the position recording unit 48. The positions of the opening portion A and the light shielding portion B are used when the left eye is imaged next time, and are updated every time the image is taken.

Next, in order to observe and photograph the right eye of the subject, the examiner operates the position adjusting lever 7 to move the optical system 43 of the fundus camera body to the left. The movement of the optical system 43 is detected by the left and right detector 6, the anterior ocular segment observation optical system 13 is inserted into the optical path O1 by the function controller 42, the infrared illumination light source 32 is turned on, and the same procedure as the left eye is performed. Then, rough alignment is performed between the eye E to be inspected and the optical system 43 of the fundus camera body, the right eye is guided by the liquid crystal shutter 45, and observation and photography are performed.

As described above, the positions of the opening portion A and the light shielding portion B of the liquid crystal shutter 45 are held until the fixation target adjusting lever 44 is operated again after being adjusted once, so that they are determined to some extent. The operation of the fixation target adjusting lever 44 can be omitted in the case of repeatedly photographing the part to be inspected, and if the desired position is changed due to the individual difference of the eye to be inspected or the discovery of an eye disease, the examiner can Is the fixation target adjustment lever 44
The eye E to be inspected can be guided to a desired position by slightly adjusting.

Further, in the second embodiment, the positions of the opening A and the light shielding portion B of the liquid crystal shutter 45 are updated every photographing, but the initial positions of the opening A and the light shielding portion B are provided, It is also possible to return the positions of the opening portion A and the light shielding portion B, which have changed at the end of shooting, to the initial positions.

Further, the liquid crystal shutter 45 and the fixation light source 46.
Instead of the above, a fixation lamp 49 composed of a plurality of LEDs as shown in FIG. 8 is provided, and the function control section 42 lights up the fixation lamps 49a, 49b, 49c, ... As shown in FIG. You may make it control an extinguishing part.

In the second embodiment, since the adjustment lever for the fixation target can be shared by the left and right eyes, there is an advantage that the structure can be simplified and the cost can be provided inexpensively. There is no mistake.

[0041]

As described above, in the ophthalmologic apparatus of the present invention, when a large number of images are taken at a fixed imaging position, such as in mass screening, the left eye and the right eye are switched. Even if the fixation target does not need to be readjusted, the operability of the ophthalmologic apparatus is greatly improved and the examination efficiency is improved.

Further, when it is necessary to guide the eye to be examined to a desired position due to the discovery of a disease or the like, the fixation target can be adjusted by a simple operation, and a photograph having a high diagnostic value can be easily provided. .

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a configuration diagram of an optical system.

FIG. 3 is a front view of a mark index.

FIG. 4 is a front view of a television monitor during fundus observation.

FIG. 5 is a perspective view of a second embodiment.

FIG. 6 is a configuration diagram of an optical system.

FIG. 7 is a front view of a liquid crystal shutter.

FIG. 8 is a cross-sectional view of a fixation lamp including an LED.

FIG. 9 is a front view.

[Explanation of symbols]

 1 Base 4, 43 Optical system 6 Left and right detector 7 Position adjustment lever 8 Shooting switch 9 Anterior eye / fundus changeover switch 10, 11 Fixation adjustment lever 20 Mark index 27 Photographing light source 30 Illumination light source 32 Infrared illumination light source 37, 38, 49 Fixation lamp 40 Infrared TV camera 41 TV monitor 42 Function control unit 44 Fixation target adjustment lever 45 Liquid crystal shutter 46 Fixation light source 48 Position recording unit

Claims (2)

[Claims] 1. An optical system for observing and photographing an eye to be inspected, an adjusting means for aligning the optical system with the eye to be inspected, and detecting which of the left and right eyes of the subject the optical system is adjusted by the adjusting means. An ophthalmologic apparatus comprising: a detection unit for controlling the fixation target, a plurality of fixation targets that can be presented at arbitrary positions, and a control unit that selects the fixation target in association with the output of the detection unit. 2. An optical system for observing and photographing an eye to be inspected, an adjusting means for aligning the optical system with the eye to be inspected, and which of the left and right eyes of the examinee the optical system is adjusted by the adjusting means. Detection means, a fixation target that can be presented at an arbitrary position, recording means that records the presentation position of the fixation target, and the fixation position that is recorded in the recording means in conjunction with the output of the detection means. An ophthalmologic apparatus comprising: a control unit that presents a visual target.