JP2003010132A - Ophthalmologic photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase efficiency in photographing, and to reduce a burden on a subject by eliminating duplicate photographing and an unphotographed part when performing panoramic photographing over a wide range of the eyeground. SOLUTION: Already photographed still picture images Sa and Sb are displayed on a television monitor 23 as a background image, and an animation image Ma of a part performing observation alignment at present is displayed on the images or the peripheries. A photographer moves a fixation target by a laser beam source 8 projected on a ceiling S by operating operation switches 19a to 19d, and performs the observation alignment in a sense of moving and observing the animation image Ma in a wide eyeground image by moving an eyeball.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art When photographing a wide range of the fundus with a fundus camera, peripheral vision is taken while observing only the region to be photographed by guiding the line of sight of the subject.

Alternatively, a predetermined fixation target for peripheral photographing is sequentially presented, and a predetermined range is photographed at a predetermined photographing magnification at a predetermined position as a reference. Has been done.

[0004]

However, the above-mentioned conventional example has the following problems.

(1) When sequentially taking peripheral images while inducing the line of sight of the subject, the range already taken is determined based on the memory of the photographer, and there is a portion where the user forgets to take an image. In addition, in order to prevent omission of photographing, duplicate photographing is often performed, which results in waste of photographing time and the like, which increases the burden on the subject.

(2) When a peripheral fixation is imaged using a predetermined fixation target, although there is no image left behind,
It is difficult to make a diagnosis when the region of interest is determined in advance and reaches the edge of the composition. In addition, even if an attempt is made to magnify an image of a region of interest with high image quality, the region of interest may not be imaged because it can be enlarged only with the fixation target position as a reference.

(3) Further, particularly when photographing with a composition that does not include a characteristic portion such as a nipple or a macular portion within the display range, it becomes difficult to relatively grasp the region to be photographed, and the subject It becomes difficult to know if you are really fixating.

The object of the present invention is to solve the above-mentioned problems,
A still image that has already been taken is displayed as a background image on the monitor, and the moving image display position for observation alignment is controlled in conjunction with it to control the movement of the fixation target. An object of the present invention is to provide an ophthalmologic photographing apparatus that can be implemented.

[0009]

In order to achieve the above object, an ophthalmologic photographing apparatus according to the present invention comprises an image pickup means for picking up a fundus image of a subject's eye, and a fixed position for presenting a line of sight of the subject. A visual target presenting means, a display means for displaying the image of the eye to be inspected picked up by the image pickup means, and a display control means for displaying the image of the eye to be inspected on the display means at a position interlocked with the fixation target presenting position. It is characterized by having.

Further, the ophthalmologic photographing apparatus according to the present invention comprises a first photographing means for photographing the fundus image of the eye to be examined as a still image, a second photographing means for photographing the fundus image of the eye to be examined as a moving image, and the subject. Fixation position target presentation means for varying the presentation position for guiding the line of sight of the subject, display means for displaying the still image captured by the first imaging means in association with the fixation target position, and the second Display control means for displaying the moving image captured by the image capturing means together with the still image on the display means in association with the fixation target presentation position.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows a configuration of a fundus camera embodying the present invention. In front of an eye E to be examined, a half mirror 1, an objective lens 2, a perforated mirror 3, and a photographing diaphragm 4 arranged in a hole of a perforated mirror 3, A focus lens 5 movable along the optical axis, a low-magnification photographing lens 6a / high-magnification photographing lens 6b, which are alternatively inserted in the optical path, and a color photographing element 7 having sensitivity to infrared light are arranged. A fundus imaging unit is configured.

Further, above the objective lens 2 and the perforated mirror 3, a laser light source 8 and a mirror 10 with a variable tilt angle provided on a rotary table 9 are arranged to project a fixation target on a ceiling S of an examination room. Then, a fixation target projection system for allowing the subject to fixate through the half mirror 1 is configured.

In the incident direction of the perforated mirror 3, there are provided a relay lens 11, an infrared light cut filter 12 which is arranged to be inserted into and removed from an optical path which blocks infrared light and transmits visible light, and a ring-shaped opening. A diaphragm 13 and a photographing light source 1 that emits a flash of light
4, a condenser lens 15, and an observation light source 16 composed of a halogen lamp or the like that emits a constant light of infrared light are arranged, and together with the perforated mirror 3 and the objective lens 2, a fundus illuminating means is constituted.

The output of the image pickup device 7 is connected to a control circuit 18 having a built-in memory 18a via a signal amplification circuit 17, and the control circuit 18 is provided with operation switches 19a to 19c for instructing a fixation target presentation position. The operating means 19, the photographing switch 20, the photographing magnification changing switch 21, the flash emission control circuit 22, the television monitor 23, the image recording means 2
4. Mirror driving means 2 for driving the turntable 9
Connect 5. The image recording means 24 is MO, MD, DVD
-A drive device that writes or reads data to or from a recording medium D that can hold a recording, even if power is not supplied externally such as a RAM, VTR tape, or hard disk

The mirror 10 combines the angle adjustment and the rotation adjustment of the rotary table 9 to form the laser spot of the light emitted from the laser light source 8 at an arbitrary position on the ceiling S of the examination room as a fixation target. Then, the subject fixes the laser spot by the reflection of the half mirror 1.

In this fundus camera, the infrared light cut filter 12 is separated from the optical path during observation alignment,
The low magnification photographing lens 6a is inserted in the optical path. The infrared light emitted from the observation light source 16 is condensed by the condenser lens 15, passes through the apertures of the photographing light source 14 and the diaphragm 13, passes through the relay lens 11, and is reflected to the left by the mirror portion around the perforated mirror 3. Then, the fundus Er is illuminated via the objective lens 2 and the half mirror 1 and the pupil Ep of the eye E to be examined.

The fundus image thus illuminated with infrared light is
It again passes through the half mirror 1, the objective lens 2, the photographing diaphragm 4, the focus lens 5, and the low-magnification photographing lens 6a, and forms an image on the image pickup element 7 and is converted into an electric signal. This signal passes through the signal amplification circuit 17 and is amplified to a predetermined amplification factor, and the control circuit 1
8 and is displayed on the television monitor 23.

On the television monitor 23, the already captured color images Sa and Sb are displayed at positions corresponding to the fixation target positions when the respective images were captured, and the moving image Ma during infrared observation is shown. It is displayed at a position corresponding to the current fixation target position.

If the photographer wants to photograph a slightly lower portion, he / she operates the switch 19c of the operating means 19 for operating the fixation target position. The control circuit 18 which has detected the input to the operation switch 19c controls the mirror driving means 25 to drive the rotary table 9 and adjust the mirror 10. As a result, the position of the laser spot projected on the ceiling S changes, and the subject fixes the spot position by the reflection of the half mirror 1.

Since the eyeball rotates with this fixation, the part to be imaged also changes. The display area of the moving image on the television monitor 23 also moves downward as the mirror 10 is operated. As a result, the photographer can observe the fundus image fixed on the television monitor 23 while moving the observation region downward.

Further, since the image of the already photographed area is displayed as described above, it is possible to avoid forgetting to photograph by aligning the observation image with the area where the color still image is not displayed.

Further, the memory 18a of the control circuit 18 stores the start address of the display window and the window size at the time of displaying the observation moving image on the television monitor 23 for each photographing magnification. The control circuit 18 recognizes the photographing magnification, and displays the alignment moving image on the television monitor 23 according to the start address and the window size corresponding to the photographing magnification. That is, like the above, the operation switch 19
The control circuit 18 which has detected the input to the a to 19d changes the start address so that the display window moves in the direction designated by any of the operation switches 19a to 19d, and controls the window display position according to the address.

The photographer uses the driving means (not shown) to adjust the position with the eye E and focus lens 5 while looking at the observed moving image fundus image Ma and the already photographed fundus images Sa and Sb displayed on the television monitor 23. Move to check the focus and shooting range. At this time, when there is no continuity between the still image already captured and the observed moving image, it is highly likely that the subject is not looking at the fixation target, and therefore it is advisable to remind the fixation target again. . And the shooting range,
After confirming that the position and focusing are good,
The shooting switch 20 is operated to shoot a still image.

The control circuit 18 which has detected the operation of the photographing switch 20 inserts the infrared light cut filter 12 into the optical path, and causes the strobe emission control circuit 22 to emit the photographing light source 14. The light emitted from the photographing light source 14 passes through the aperture of the diaphragm 13 having a ring-shaped aperture, and the infrared light cut filter 12
Only transmits visible light, passes through the lens 11, is reflected to the left by a part of the mirror around the perforated mirror 3, and illuminates the fundus Er through the objective lens 2, the half mirror 1, and the pupil Ep of the eye E to be examined. To do.

The thus-illuminated fundus image again passes through the half mirror 1, the objective lens 2, the photographing diaphragm 4, the focus lens 5, and the low-magnification photographing lens 6a to form an image on the image sensor 7 and is converted into an electric signal. To be done. This signal is the signal amplification circuit 1
It is amplified to a predetermined amplification factor through 7 and inputted to the control circuit 18, and together with the presentation position information of the fixation target, the image recording means 2
4 is recorded on the recording medium D and displayed on the television monitor 23.

When taking a magnified image, the photographer operates the magnification changing switch 21 for changing the photographing magnification. The control circuit 18 which has detected the input to the magnification change switch 21 removes the low magnification photographing lens 6a from the optical path and inserts the high magnification photographing lens 6b for magnifying photographing into the optical path. Shooting switch 2
When 0 is pressed, the light emitted from the observation light source 16 illuminates the fundus Er, and the fundus image illuminated in this manner is again the half mirror 1, the objective lens 2, the photographing diaphragm 4, the focus lens 5,
An image is formed on the image pickup device 7 through the high magnification photographing lens 6b and converted into an electric signal. This signal passes through the signal amplification circuit 17, is amplified to a predetermined amplification factor, is input to the control circuit 18, and is displayed on the television monitor 23.

As shown in FIG. 2, the color images Sa, Sb, Sc already taken on the television monitor 23 are displayed as background images at the positions corresponding to the fixation target positions when the respective images were taken. Therefore, the moving image Mb during infrared observation is displayed at a position corresponding to the current fixation target position. Here, as shown in FIG. 2, the display image Mb has a narrow display range because the narrow range of the fundus Er is enlarged and imaged. However, a high-definition image can be obtained by enlarging and capturing the image.

As described above, the fixation target operating means 19 is operated to guide the observation image to the region of interest to be magnified and photograph a still image. Similarly, the light emitted from the photographing light source 14 illuminates the fundus Er, and the illuminated fundus image is formed on the image sensor 7 and converted into an electric signal. This signal passes through the signal amplification circuit 17, is amplified to a predetermined amplification factor, is input to the control circuit 18, and is displayed as a color still image Sd on the television monitor 23 as shown in FIG.

FIG. 4 is a flow chart showing the operation when the fixation target operating means 19 is operated. The fixation target presentation position is stored in the memory 18a of the control circuit 18 (fadx, fadx
y). Operation switches 19a-19d
The control circuit 18 that has detected the input to the operation switch 19
The fixation target presentation position stored in the memory 18a is changed according to the input to a to 19d. At the same time, the changed position information is output to the mirror driving means 25. Upon receiving the position information, the mirror driving means 25 uses the function F to convert the position information into the tilt angle α of the mirror 10 and the rotation angle β of the turntable 9 as in the following equation.

(Α, β) = F (fadx, fady) Based on this, the tilt angle of the mirror 10 and the turntable 9
Control the rotation angle of. Thereby, the laser light emitted from the laser light source 8 forms a spot on the ceiling S at a position corresponding to the fixation target position, and guides the line of sight of the subject.

Further, the memory 18a is a function Gs, GL for calculating the start address of the display window when the observation moving image is displayed on the television monitor 23 from the fixation target position.
Is stored as follows.

Normal imaging window start address (Swsx, Swsy) = Gs (fadx, fady) Enlarged imaging window start address (Lwsx, L)
wsy) = Gl (fadx, fady) As shown in FIG. 1, the address of the upper left portion of the normal imaging moving image display window Ma is (Swsx, Swsy).
As shown in FIG. 2, the address of the upper left portion of the moving image display window Mb for magnified imaging is (Lwsx, Lws
y).

Further, the window size Sws for normal imaging is used.
ize and the window size Lwsize for magnified imaging are also stored. That is, the control circuit 18 recognizes the photographing magnification, calculates the start address corresponding to the photographing magnification from the fixation target presentation position (fadx, fady) using the functions Gs and Gl, and determines the window size corresponding to the photographing magnification. A moving image for alignment observation is displayed on the television monitor 23. This allows the photographer to operate the operation switches 19a to 19a.
By operating d, the fundus image at an arbitrary position can be observed on the television monitor 23.

In the above embodiment, the fixation target projected on the ceiling S is fixed by the eye to be inspected. However, when the half mirror 1 as described above is arranged in the photographing optical path, both the illumination light amount and the photographing light amount are transmitted. Rate is reduced and light utilization efficiency is poor. Therefore, instead of the half mirror 1, it is preferable to dispose a mirror in front of the eye opposite to the subject eye so as to fixate the fixation target projected on the ceiling S. Even in this case, since the convergence occurs, the fixation position of the subject eye does not change even if the fixation is performed by the other eye.

In the above embodiment, the fixation target is projected on the ceiling S, but it may be projected on the diffusion surface which functions as a screen.

When the observation moving image described in the above embodiment is converted into a monochrome image and displayed, it can be easily distinguished from the already captured color image, so that the photographing effect can be further improved.

[0037]

As described above, the ophthalmologic photographing apparatus according to the present invention can observe and align the already photographed image as the background image, so that the line of sight can be efficiently guided. As a result, it is possible to prevent leakage of imaged portions or duplicate image pickup, and thus image pickup efficiency is improved.

Further, since the image already taken is displayed around the observed image, it is necessary to confirm whether or not the subject really fixes the fixation target by confirming the continuity of the image. The shooting efficiency is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a fundus camera of an embodiment.

FIG. 2 is an explanatory diagram of a fundus image on a television monitor.

FIG. 3 is an explanatory diagram of a fundus image on a television monitor.

FIG. 4 is a flowchart of an operation.

[Explanation of symbols]

1 half mirror 2 Objective lens 3 perforated mirror 5 Focus lens 5 shooting lens 6a, 6b Lens for photography 7 Image sensor 8 laser light source 9 rotating table 10 mirror 14 Photography light source 14 Photography light source 16 Observation light source 17 Signal amplification circuit 18 Control means 19 Operation means 20 Shooting switch 21 Shooting magnification change control switch 22 Flash control circuit 23 TV monitor

Claims (3)

[Claims] 1. An image pickup means for picking up a fundus image of an eye to be inspected, a fixation target presenting means for changing a presentation position for guiding a line of sight of a subject, and a display means for displaying the eye image of the eye imaged by the image pickup means. An ophthalmologic imaging apparatus comprising: a display control unit that displays the image of the eye to be inspected on the display unit at a position interlocked with the fixation target presentation position. 2. A first image pickup means for picking up a still image of the fundus image of the eye to be inspected, a second image pickup means for taking a moving image of the fundus image of the eye to be inspected, and a variable presentation position for guiding the line of sight of the subject. The fixation target presenting means, the display means for displaying the still image captured by the first imaging means in correspondence with the fixation target position when the still image is captured, and the moving image captured by the second imaging means. An ophthalmologic imaging apparatus, comprising: a display control unit that displays the still image together with the fixation target presentation position on the display unit. 3. The ophthalmologic imaging apparatus according to claim 2, wherein the moving image captured by the second image capturing unit is an infrared observation image for observation alignment.