JPH11113852A - Ophthalmologic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a burden to an examinee at fixation guiding time, and excellently guide a fixation by providing a shutter member to partially control a passing quantity of light flux emitted from a light source by opening/closing a shutter and a shutter control means to flash a fixation lamp by opening/ closing the shutter member. SOLUTION: When an illuminating light source 36 is lighted, a light flux is reflected by a perforated mirror 22, and illuminates the eyeground Er of an eye E to be examined. The reflected light from the eyeground Er forms an image on an image pickup surface F' of an infrared telecamera 44 through an optical path 03, and is relected on a monitor 15 as an eyeground image Er'. At this time, a part of a light flux of a fixation lamp composed of a liquid crystal shutter 41 and a fixation lamp light source 42, is reflected by a field lens 38, and an image is formed on the image pickup surface F' through a half mirror 39, and is displayed on the monitor 15 as a target image A'. The light flux passing through the lens 38 is reflected by a changeover mirror 25, and is projected on the eye E to be examined. An examinee is made to steadily gaze at the fixation lamp, and precise alignment of the eye E to be examined and an optical system 14 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus such as a fundus camera used in an ophthalmic clinic or the like.

[0002]

2. Description of the Related Art Conventionally, in an ophthalmologic apparatus such as a fundus camera,
A fixation target is provided to guide the subject's eye to a desired observation / photographing site or to stabilize the line of sight. The fixation target is provided with a movable point light source outside the housing, and moving the point light source while fixing the subject to change the direction of the line of sight, so that the target portion of the fundus camera is An external fixation target to be included in the field of view, and by allowing the subject to fixate the target that is provided inside the housing and optically projected to an arbitrary position through the objective lens, the target portion is defined. There is an internal fixation target that is guided in the field of view.

[0003] The internal fixation target has a point light source 2 attached to one end of a position-adjustable lever 1 having a rotation center O as shown in FIG. 4, or as shown in FIGS. 5 and 6. A plurality of point light sources 3 arranged in a matrix to control a light source 3a to be lit, or FIGS. 7 and 8
As shown in FIG. 1, a combination of a transmissive area A partially provided in a light shielding member such as a liquid crystal shutter 4 and a fixation light source 5 is known. In these devices, the light sources 2, 3, and 5 are controlled so as to blink and light in order to draw the subject's attention to the fixation target.

[0004]

However, in the above-described combination of the liquid crystal shutter 4 and the fixation lamp light source 5 in the above-described conventional example, complete liquid crystal shutter 4 alone cannot provide 100% light shielding, and some fixation is not possible. Light flux leakage of the lamp light source 5 occurs. Here, the fixation lamp light source 5 is used to blink the fixation target.
Blinks on the subject, as shown in FIG. 9 (a), the liquid crystal shutter 4
The state in which the luminous flux transmitted through the light transmitting area A provided in the eye is visually recognized as the fixation target, and the fixation lamp light source 5 as shown in FIG.
The state in which the display is darkened by turning off the light is alternately presented for each blinking cycle of the fixation lamp light source 5. That is, the state in which the fixation target is on the background with the leaked light and the state of complete darkness are alternately repeated.

[0005] In an ophthalmologic apparatus used in a quasi-dark room, particularly in a non-mydriatic retinal camera for photographing the fundus with a natural mydriasis, such a change in the background due to such subtle leakage light affects the subject. Since the fixation target is difficult to see, the burden on the subject at the time of fixation guidance increases, and good fixation guidance cannot be performed, and a problem arises in that an image effective for diagnosis cannot be obtained.

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 performing good fixation guidance while reducing a burden on a subject during fixation guidance.

[0007]

To achieve the above object, an ophthalmologic apparatus according to the present invention comprises a shutter member for partially controlling a transmission amount of a light beam emitted from a light source by opening and closing a shutter, and an objective lens. And a shutter control unit that blinks the fixation lamp by opening and closing the shutter member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a perspective view of a non-mydriatic retinal camera according to an embodiment. A face support unit 12 is attached to a subject side of a base 11, and the position of the base 11 can be adjusted in front, rear, left, right, and up and down directions. Stage 13 is attached. The optical system 1 of the fundus camera is provided on the stage 13.
4 and a television monitor 15, a camera unit 16 having a photographic film is mounted on the optical system 14, and a focus lever 17 for performing a focusing operation is mounted. On the examiner's side of the stage section 13, an operation rod including a position adjusting lever 18 and a photographing switch 19 for aligning the subject's eye with the optical system 14 of the fundus camera, and a projection position of a fixation lamp are changed. Fixation light switch 20 comprising a small operation stick for the purpose is provided.

FIG. 2 shows the configuration of the optical system 14. An objective lens 21, a perforated mirror 22 having a central opening, a focusing lens 23 movable in the direction of the optical path O1, and an objective lens 21 on the optical path O1 in front of the eye E to be examined. A photographing lens 24 and a switching mirror 25 that jumps upward at the time of photographing are sequentially arranged, and reach a film 26 in the camera unit 16 used at the time of photographing, thereby forming an observation photographing optical system.

On the optical path O2 in the incident direction of the perforated mirror 22, the corneal baffle 27, the relay lenses 28 and 29, the lens baffle 30, the ring slit 31 having an annular opening, the condenser lens 32, the xenon Photographing light source 33 composed of a tube or the like, condenser lens 3
4. An illumination optical system is formed by sequentially arranging an infrared filter 35 that transmits infrared light, an illumination light source 36 including a halogen lamp and the like, and a concave reflecting mirror 37.

The optical path O3 in the reflection direction of the switching mirror 25
A field lens 38, a half mirror 39, a lens 40, a liquid crystal shutter 41 for partially opening and closing a shutter to form a light transmitting area, and a fixation lamp light source 32 are sequentially arranged on the top, and a fixation lamp projection optical system is provided. A system has formed. The liquid crystal shutter 41 has a configuration shown in FIGS.
The light flux transmitted through the transmission area A formed in the liquid crystal shutter 41 is projected onto the eye E as a fixation target. Further, the transmission area A formed in the liquid crystal shutter 41 can be changed by the fixation light adjustment switch 20, and the fundus of the eye E to be examined
Er can be guided to a desired imaging region.

A television lens 43 and an infrared television camera 44 are arranged on an optical path O4 in the reflection direction of the half mirror 39, and the output of the infrared television camera 44 is connected to the television monitor 15. The fundus Er of the subject's eye E, the image plane F near the field lens 38, the imaging plane F 'of the infrared television camera 44, and the liquid crystal shutter 41 are configured to have a substantially conjugate relationship.

A function control unit 45 for controlling the operation of the fundus camera is provided. The function control unit 45 is connected to the outputs of the photographing switch 19 and the fixation lamp adjustment switch 20 provided on the stage unit 13. ing. And the function control unit 4
5 corresponds to the output of the two switches 19 and 20 described above,
The switching mirror 25, the imaging light source 33, the illumination light source 36, the liquid crystal shutter 41, and the fixation lamp light source 32 are controlled by driving means (not shown).

In the above configuration, first, the fundus of the eye E to be examined
Optical system 1 of eye E to be examined and fundus camera
4 and rough alignment is performed. The subject is seated in front of the objective lens 21, and the face of the subject is fixed to the face support unit 12 so that the subject's eye E and the objective lens 21 face each other.
Then, the stage section 13 is moved by the position adjusting lever 18 and coarsely adjusted so that the optical path O1 of the optical system 14 substantially matches the eye E of the subject.

When the rough alignment with respect to the eye E is completed and the illumination light source 36 is turned on, the light beam from the illumination light source 36 passes through the optical path O2, is reflected by the perforated mirror 22, and passes through the fundus Er of the eye E. Light up. The reflected light from the fundus Er passes through the optical path O1, the optical path O3, and the optical path O4 to form an image on the imaging surface F 'of the infrared television camera 44, and the fundus image Er' is projected on the television monitor 15.

The luminous flux of the fixation lamp comprising the liquid crystal shutter 41 and the fixation lamp light source 32 is applied to an image plane F near the field lens 38.
And a part thereof is reflected by the field lens 38 in the returning direction, passes through the half mirror 39 and the television lens 43, forms an image on the imaging surface F 'of the infrared television camera 44, and generates a target image A'. Fundus image Er 'on the television monitor 15
Is displayed on the screen. The light beam transmitted through the field lens 38 is reflected to the left by the switching mirror 25, and is projected on the eye E through the optical path O1. The subject gazes at the fixation lamp, and the examiner performs precise alignment between the subject's eye E and the optical system 14.

When the examiner operates the fixation lamp adjustment switch 20 to guide the fundus Er of the eye E to a desired imaging site, the input to the fixation lamp adjustment switch 20 is transmitted to the function control unit 45.
The function control unit 45 changes the transmission area A formed in the liquid crystal shutter 41. That is, by operating the fixation light adjusting switch 20, the projection position of the fixation light is changed, and the fundus Er is guided to a desired imaging region.

In such a fixation guidance operation, when the fixation lamp blinks in order to draw the attention of the subject, the function control unit 45 turns on the fixation lamp light source 32 and returns “the transmission region A is present. The liquid crystal shutter 41 is controlled so that the "state" and the "state where the entire area is shielded from light" are alternately repeated.

FIG. 3 shows a flashing fixation light presented to the subject. A general liquid crystal shutter 41 is 100
% Perfect light shielding is not possible, and some light flux is transmitted. Here, when the fixation lamp light source 32 is turned on and off, the subject is notified as shown in FIG.
The state in which the fixation target is lit in the light leaked by the fixation lamp light source 32 as shown in FIG. 3 and the state in which only the light leaked by the fixation lamp light source 32 is seen as shown in FIG. Will be presented. That is, since the subject looks as if only the fixation target by the transmission area A is blinking in a state where the subject has a certain background light from the fixation lamp light source 32, the fixation target is visually recognized by the subject. It is easy to do and looks good.

The examiner observes the fundus image Er ′ on the television monitor 15 while watching the alignment and focus lever 17.
Is operated to move the focusing lens 23 by a drive mechanism (not shown) to perform a focusing operation. Thereafter, when the photographing switch 19 is pressed, the output of the photographing switch 19 is transmitted to the function control unit 45, the switching mirror 25 is retracted to a position shown by a broken line by a driving unit (not shown), and the photographing light source 33 emits light. The luminous flux from the imaging light source 33 is reflected by the perforated mirror 22 via the optical path O2, and the fundus Er of the eye E to be inspected.
To reach. The reflected light from the fundus Er forms an image on the film 26 via the optical path O1, and the fundus Er of the eye E is photographed.

[0021]

As described above, in the ophthalmologic apparatus according to the present invention, the amount of light transmitted by the light source is controlled by opening and closing the shutter member to blink the fixation lamp, so that a fixed background light exists. Since only the fixation lamp appears to be blinking due to the transmission area of the shutter member, the fixation target is easily visible to the subject and the appearance is improved. Therefore, the burden on the subject in the fixation guidance is reduced, good fixation guidance can be performed, and an image that is extremely effective for diagnosis can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a non-mydriatic retinal camera of an embodiment.

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

FIG. 3 is an explanatory diagram of a blinking fixation light as viewed from a subject.

FIG. 4 is a side view of a conventional rotating fixation lamp.

FIG. 5 is a side view of a fixation lamp using a point light source.

FIG. 6 is a front view.

FIG. 7 is a side view of a fixation lamp using a liquid crystal shutter.

FIG. 8 is a front view.

FIG. 9 is an explanatory diagram of a blinking fixation lamp viewed from a subject.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Base 12 Face support part 13 Stage part 14 Optical system 15 Television monitor 16 Camera part 17 Focus lever 18 Position adjustment lever 19 Shooting switch 20 Fixation light adjustment switch 22 Perforated mirror 25 Switching mirror 26 Film 27 Corneal baffle 30 Crystal lens baffle 33 light source for photography 36 light source for illumination 39 half mirror 41 liquid crystal shutter 42 fixation lamp light source 44 infrared television camera 45 function control unit

Claims (1)

[Claims] A shutter member for partially controlling a transmission amount of a light beam emitted from a light source by opening and closing a shutter; a fixation lamp projection unit for projecting a fixation lamp to an eye to be examined through an objective lens; and the shutter An ophthalmologic apparatus comprising: shutter control means for blinking the fixation light by opening and closing a member.