JP2002306419A - Fundus camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and certainly photograph the predetermined peripheral part of the fundus. SOLUTION: A ring-shaped rotary member 52 is provided to the lens barrel 51 of an object lens 1 in a freely rotatable manner and a light source part 54 equipped with a target light source 53 emitting directional luminous flux is attached to one place of the rotary member 52. By a display showing that the light source part 54 is allowed to light, an examiner is informed of such a state that the predetermined peripheral part of the fundus is photographed. When the light source part 54 is rotated by a predetermined angle by the rotary member 52, the light source part 54 reaches the predetermined angle judged by the click touch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera used in ophthalmic clinics and the like.

[0002]

2. Description of the Related Art In examining an adult disease using a fundus camera, a predetermined part of the fundus is often photographed. However, depending on the target disease, it may be necessary to photograph the area around the fundus oculi.

[0003]

However, in the conventional fundus camera, it is not always easy to photograph the fundus of a specific part around the fundus camera.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a fundus camera capable of easily photographing a position around the fundus.

[0005]

According to a first aspect of the present invention, there is provided a fundus camera for presenting a plurality of fixation targets at predetermined positions for photographing a peripheral portion of the fundus. And imaging means for capturing an image of the eye to be inspected, and display means for displaying an image obtained by the imaging means, and a display indicating that a predetermined peripheral portion of the fundus has been taken is displayed together with the image of the eye to be inspected. A fundus camera characterized in that it is displayed on a means.

According to a second aspect of the present invention, there is provided a fundus camera for observing an anterior ocular segment of a subject's eye, and a plurality of cameras located at predetermined positions for photographing a peripheral portion of the fundus when the anterior segment is observed by the observing unit. And a target means for presenting the fixation target.

According to a third aspect of the present invention, a fundus camera projects a fixation target through an observation means for observing an anterior ocular segment by inserting and removing a lens between an objective lens and a perforated mirror, and a focus lens of a photographing system. And a fundus camera that projects the target of the target unit to the eye to be examined through the objective lens through the periphery of the lens and the objective lens.

According to a fourth aspect of the present invention, there is provided a fundus camera for presenting a plurality of fixation targets at predetermined positions for photographing a peripheral portion of the fundus, imaging means for capturing an image of a subject's eye, and the imaging means. Display means for displaying an image obtained by the means, wherein a display of a photographed fundus peripheral position is displayed on the display means together with the eye image to be examined.

According to a fifth aspect of the present invention, a fundus camera includes an anterior segment observing unit for observing an anterior segment of a subject's eye, an optotype unit for presenting the fixation optotype at a plurality of positions, and a display unit. A fundus camera characterized in that a display of the position of the fixation target is displayed on the display together with an anterior segment image by the anterior segment observation unit.

According to a sixth aspect of the present invention, a fundus camera includes an anterior segment of a subject's eye, a positioning unit, and a plurality of fixation light sources for photographing a periphery provided at predetermined positions in front of an objective lens. Fundus camera.

A fundus camera according to a seventh aspect is a fundus camera characterized in that a fixation target for peripheral photographing is rotatably provided around a lens barrel of an objective lens.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a configuration diagram of an optical system of a fundus camera according to an embodiment. An objective lens 1, an optical unit 2, and a perforated mirror substantially conjugate to a pupil of the eye E are provided on an optical path O1 facing the eye E. 3. Focus lens 5 driven by drive means 4, imaging lens 6 for imaging the fundus image near the field lens, flip-up mirror 7, field lens 8, fundus image near field lens 8 to be formed on a digital camera A relay lens 9 and a digital camera 10 for fundus photography are arranged. The optical unit 2 is a glass plate 1 provided with a convex lens 11 and an on-axis light diffusion unit 12.
3. Split plate 15 provided with split prism 14
The light source 16 is disposed on the side of the optical unit 2 so as to face the glass plate 13 of the optical unit 2.

On the illumination optical path O2 leading to the perforated mirror 3, an observation light source 17 composed of a halogen lamp, a condenser lens 18, a photographing light source 19 as a strobe tube, and a lens 20 are arranged toward the perforated mirror 3. The field lens 2 is placed on the optical path O3 in the reflection direction of the flip-up mirror 7.
1. A light splitting mirror 22, a lens 23, and an area array liquid crystal plate 24 as a fixation target are arranged. A lens 25 and an observation video camera 26 are provided on the optical path O4 in the reflection direction of the light splitting mirror 22. And the video camera 26
Is connected to a monitor 27, and an optotype button 28 is attached to the monitor 27.

FIGS. 2, 3 and 4 show images on the monitor 27. FIG. 2 and 3 show an anterior eye image Ea when the optical unit 2 is placed in the optical path O1, and FIG. 4 shows a fundus image Er when the optical unit 2 is removed from the optical path O1.

When photographing a predetermined fundus position in the center and the periphery of the fundus, first, the optotype button 28 is pressed and the liquid crystal panel 24 is pressed.
Are sequentially presented at predetermined positions. When the optotype button 28 is pressed while the optical unit 2 is in the optical path O1, the screen shown in FIG. 2 is displayed.
When the optical unit 2 is inserted into the optical path O1, the light source 16 is turned on to illuminate the diffusing portion 12 on the optical axis from inside the glass plate 13, and this serves as a central fixation target during anterior segment observation. At this time, the peripheral photographing display L is displayed on the monitor 27, and it can be understood that the peripheral photographing mode has been entered.

The peripheral image display L is composed of a center indicating a predetermined fundus position and five points of up, down, left and right, and the portion of the target which is lit at that time blinks. At first, the fixation target is turned on at the center, so that the center point blinks. On the monitor 27, an alignment mark M1 indicating a lighting target position is displayed by a mark generation circuit at a central portion which is a center fixation target presenting position, to notify the examiner that the target is present at the center. . The examiner instructs the subject to look at the central target.

The examiner aligns the pupil with the alignment mark M2 displayed by the mark generating circuit and centered on the optical axis. At the same time that the optical unit 2 is removed from the optical path O1 for observing the fundus image, the liquid crystal plate 24 presents a target to the examiner at the center of the optical axis, and the position is displayed on the fundus image Er on the monitor 27 shown in FIG. Is displayed as a target mark M3. The focus lens 5 is moved by the driving means 4 to focus on the fundus, and the photographing shutter is pressed to take a picture, and the position of the focus lens 5 at that time is stored in the storage means.

The flip-up mirror 7 jumps up, the photographing light source 19 emits light, and the fundus image Er is picked up by the digital camera 10 and stored. The peripheral shooting display L is displayed in black so that the center point indicates that shooting has been completed. When the photographing ends, the optical unit 2 enters the optical path O1, and the screen of the monitor 27 displays the anterior eye image Ea again.

Next, in order to photograph the peripheral portion, a target is presented by the liquid crystal plate 24 even when observing the anterior segment. When observing the anterior ocular segment, the focus lens 5 is driven to control the split plate 15 so as to be in focus. Since the target is blurred due to the diopter of the eye E, a large area of the liquid crystal panel 24 is turned on to be a peripheral target.

The peripheral target is first presented above the eye E to be examined. The line of sight O5 when the subject's eye E sees it is
It passes through the periphery of the objective lens 1 and the outside of the lens 11 of the optical unit 2 to reach a predetermined peripheral position of the liquid crystal plate 24. FIG. 3 shows the screen of the monitor 27 at that time. The point above the peripheral shooting display L is displayed blinking so as to indicate lighting. An optotype mark M3 indicating the position is displayed at the top of the screen.

The examiner knows that the target is presented upward from the monitor 27, and instructs the subject to look at it. The examiner adjusts the position of the apparatus optical system with the joystick, and aligns the pupil with the alignment mark M2.
Again, the optical unit 2 is taken out of the optical path O1, and the screen is switched to the fundus image Er as shown in FIG. At this time, if the focus lens 5 is controlled so as to be driven to the position stored at the time of the previous center photographing, the focus is roughly focused on the fundus.

Since the focus is on the fundus, the liquid crystal plate 2
At 4, the small target is presented at the same position. An optotype mark M3 indicating the position is displayed on the monitor 27 together with the fundus image Er. When the subject's eye E is looking upward, the macula is displayed at the bottom of the screen because it is at the bottom of the screen. In addition, focus and position adjustments are taken.

In the predetermined position photographing mode, the target by the liquid crystal plate 24 is sequentially switched to the upper, lower, left, and right sides each time photographing is completed. Also, each time the fundus image Er is monitored and photographed, the optical unit 2 enters the optical path O1 and switches to the anterior eye image Ea. The points of the peripheral shooting display L at the position where the shooting has been completed are displayed in black, the points where the optotypes are lit blink, and the points not shot are displayed in white. Each time the image is switched to the anterior eye image Ea, the focus lens 5 is driven, and is controlled to a predetermined focus position so that the split plate 15 is in focus.

In this mode, the focus position at the time of the last photographing is stored in the five photographings of the center, up, down, left, and right, and the focus lens 5 is moved each time the fundus image Er is switched. Set to focus position. When the photographing of the predetermined five fundus positions is completed, the focus adjustment based on the memory is stopped, and the photographing in this mode ends.

FIGS. 5 and 6 show another example of the optical unit 2 ', which is provided with an optotype for the peripheral portion when observing the anterior segment. FIG. 5 is a configuration diagram, and FIG. 6 is a diagram of the split plate 31 viewed from the optical axis direction. The split plate 31 is large enough to cover the entire visual field, and provided with diffusing portions 32 at a total of four locations on the periphery, up, down, left, and right.
Each diffuser 32 is illuminated by four light sources 33 arranged outside.

When the center unit is to be photographed with the optical unit 2 'in the optical path O1, the light source 16 is turned on and the diffusing unit 1 on the optical axis is turned on.
2 illuminates and functions as a target, and when photographing a peripheral portion, the four light sources 33 are sequentially turned on to illuminate each of the diffusion units 32 to be used as a target.

FIG. 7 and FIG. 8 show another example of the peripheral optotype. A ring-shaped member 43 in which a plurality of anterior segment illumination light sources 41 and a plurality of peripheral optotype light sources 42 are arranged on a circumference is provided by an objective lens. It is attached to the front of the lens barrel 44 of the objective lens 1 so as to be located outside the optical path O1 immediately before 1.

When the light sources 42 of the peripheral optotypes are sequentially turned on,
In response to this lighting, the monitor 27 also displays the peripheral image display L as shown in FIG. 3 even when the anterior ocular segment image Ea is displayed.
Further, an optotype mark M3 of FIG. 4 indicating the position of the optotype is displayed on the end or outside of the fundus image Ea together with the fundus image Er. Along with the photographed fundus image Er, which peripheral index light source 42 was photographed is recorded.

By providing the peripheral optotype light source 42 in front of the objective lens 1 in this manner, the size around the objective lens 1 does not change. You can take pictures of the surrounding area without the need. At the time of observation of the anterior eye part, the eye E to be inspected comes at a predetermined distance, so that the peripheral eye target light source 42 cannot be seen by other eyes.

FIG. 9 shows another example of a peripheral target. A ring-shaped rotating member 52 is rotatably provided on the lens barrel 51 of the objective lens 1. A light source unit 54 having a target light source 53 that emits a light beam having directivity is attached to one position of the rotating member 52.

By making the light beam have directivity, it cannot be seen by other eyes, and the target light source 53 appears far away and does not cause miosis. The light source unit 54 is provided with the point-like target light source 53 and a lens, and is turned on by a switch (not shown).

A display indicating that the light is turned on is displayed together with the image of the eye to be inspected, and informs the examiner that the image is taken around the predetermined fundus. When the light source unit 54 is rotated at a predetermined angle by the rotating member 52, a click is provided, and it can be recognized by touch that the click has been reached. Four clicks are provided every 90 degrees or six clicks are provided every 60 degrees.

The rotation of the rotating member 52 may be performed by a motor. In that case, the angle at which the optotype light source 53 is lit is displayed together with the image of the eye to be examined, as in the peripheral image display L. Also, the angle at which the image was photographed is recorded together with the photographed fundus image Er. When the optotype optical path 52 is not used, if the light source unit 54 is stored at an angle reaching the lower part of the lens barrel 51, it does not hinder the operation.

In the embodiment, an example has been shown in which the optical units 2, 2 'are taken in and out between the objective lens 1 and the perforated mirror 3 as the anterior ocular segment observation means. The anterior segment may be configured to be imaged by the video camera 26 without intervention. In that case, the focus lens 5 associated with switching between the anterior segment and the fundus oculi.
No adjustment is required.

[0035]

As described above, the fundus camera according to the first aspect of the present invention can easily and reliably photograph a predetermined peripheral portion of the fundus.

In the fundus camera according to the second aspect, instructions to the subject can be appropriately executed, and a predetermined peripheral portion of the fundus can be photographed easily and reliably.

The fundus camera according to the third aspect can easily and reliably photograph a predetermined peripheral portion of the fundus by effectively using the internal optotype even when observing the anterior ocular segment.

The fundus camera according to the fourth aspect is capable of grasping the progress of photographing and easily and reliably photographing a predetermined portion around the fundus.

In the fundus camera according to the fifth aspect, the relationship between the direction in which the subject's eye is looking and the position of the optotype at the time of observing the anterior eye can be known, and the operability can be improved.

In the retinal camera according to the sixth aspect, since the lens barrel of the objective lens is not enlarged, the retinal camera does not hit the face and can easily and reliably photograph a predetermined peripheral portion of the fundus.

In the fundus camera according to the seventh aspect, the fixation target can be stored at an angle that does not interfere when not in use.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment provided with peripheral fixation means inside.

FIG. 2 is a front view of an anterior eye part monitor screen.

FIG. 3 is a front view of an anterior eye part monitor screen.

FIG. 4 is a front view of a fundus monitor screen.

FIG. 5 is a configuration diagram of another example of an internal peripheral fixation target.

FIG. 6 is a front view of a part thereof viewed from an optical axis direction.

FIG. 7 is a configuration diagram of an example of an external peripheral fixation target;

FIG. 8 is a front view as seen from the optical axis direction.

FIG. 9 is a configuration diagram of another example near the external peripheral fixation target.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2, 2 'Optical unit 3 Perforated mirror 5 Focus lens 7 Jumping mirror 10 Digital camera 12, 32 Diffusion part 15 Split prism 16, 33, 41, 42, 53 Light source 17 Observation light source 19 Imaging light source 24 Liquid crystal plate 26 video camera 27 monitor 43 ring-shaped member 44, 51 lens barrel 52 rotating member

Claims (7)

[Claims] 1. A target means for presenting a plurality of fixation targets at predetermined positions for photographing a peripheral portion of the fundus, an image pickup means for picking up an image of a subject's eye, and an image obtained by the image pickup means And a display unit for displaying the image of the eyeground to be inspected, and a display indicating that the image of the periphery of a predetermined fundus is being taken together with the image of the subject's eye is displayed on the display unit. 2. An anterior segment observing unit for observing an anterior segment of a subject's eye, and a plurality of fixation targets at a predetermined position for photographing a peripheral portion of the fundus when observing the anterior segment by the observing unit. A fundus camera comprising: a target means for presenting. 3. An observing means for observing an anterior ocular segment by inserting and removing a lens between an objective lens and a perforated mirror; an optotype means for projecting a fixation optotype via a focus lens of a photographing system;
A fundus camera, wherein a target of the target means is projected onto the eye to be examined through the objective lens through the periphery of the lens. 4. A target means for presenting a plurality of fixation targets at predetermined positions for photographing a peripheral portion of the fundus, an image pickup means for picking up an image of a subject's eye, and an image obtained by the image pickup means. A fundus camera, comprising: display means for displaying, and a display of a photographed peripheral portion of the fundus oculi on the display means together with the image of the eye to be inspected. 5. An anterior segment observing unit for observing an anterior segment of a subject's eye, an optotype unit for presenting a plurality of fixation targets, and a display unit, wherein the position of the fixation unit is provided. A fundus camera, wherein the display is displayed on the display unit together with the anterior segment image by the anterior segment observation unit. 6. A fundus camera comprising: an anterior segment of an eye to be examined; a positioning unit; and a plurality of fixation light sources for peripheral imaging provided at predetermined positions in front of an objective lens. 7. A fundus camera characterized in that a fixation target for peripheral photographing is rotatably provided around a lens barrel of an objective lens.