JPH1176166A - Fundus imaging device - Google Patents

Abstract

(57) [Summary] [Problem] To display a correct fundus diagram with computer graphics even when the left and right eyes change or when the imaging magnification changes. A luminous flux of an infrared LED light source (23) is a lens (2).
2, light splitting member 16, focusing lens 15, hole of perforated mirror 6, light splitting member 7, objective lens 2,
A light beam is projected from the center of the pupil P to the fundus R. The reflected light returns along the optical path, is reflected by the perforated mirror 6, and is
Then, the light is reflected by the reflection surface 4a of the light splitting member 4, passes through the lens 9, the two-piece wedge prism 10, and the lens 11, and forms an image on the linear CCD 12 as two light fluxes. From this signal, the interval between the two light beams is detected by the arithmetic control means 30, and the diopter of the eye E is detected. At the time of positioning, the focusing lens 15 is driven by the driving unit 15a based on the diopter, and focusing is automatically performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

[Prior art]

(1) Conventionally, Japanese Patent Application Laid-Open No. 7-88082 discloses that a fixation target position is detected, and a fundus diagram is displayed by computer graphics based on the position.

(2) Further, in a fundus camera that performs three-dimensional imaging by shifting the optical system sideways and performing imaging twice, the lateral movement of the slide is mechanically determined to perform imaging.

(3) Japanese Patent Application No. 50-58031 discloses that
As a light-blocking member when using a non-mydriatic retinal camera that aligns with infrared light in a bright room, from a light-blocking unit that covers the entire subject's head and a telescopic member that connects the face cradle and the optical system Light-shielding means is used.

[0005]

[Problems to be solved by the invention]

(A) However, in the above-mentioned conventional example (1), there is a problem that a correct fundus diagram cannot be obtained due to switching between the left and right eyes and zooming.

(B) In the above conventional example (2),
There is a problem that the amount of displacement of the slide table varies depending on the movement of the subject's eye.

(C) In the above-mentioned conventional example (3), there is a problem that the face of the subject cannot be seen or that there is no space for a hand for raising the eyelid.

A first object of the present invention is to solve the above-mentioned problem (a).
It is therefore an object of the present invention to provide a fundus photographing apparatus which displays a correct fundus diagram by computer graphics even when the left and right eyes change or the photographing magnification changes.

A second object of the present invention is to solve the above problem (b).
It is therefore an object of the present invention to provide a fundus photographing apparatus which can perform photographing with a constant shift amount of a slide table even when an eye moves when sequentially performing stereoscopic fundus photographing.

A third object of the present invention is to solve the above problem (c).
To provide a fundus photographing device that can be photographed in a bright room using a non-mydriatic retinal camera that aligns the observation position with infrared light, and that shows the position of the face and does not interfere with raising the eyelids is there.

[0011]

According to a first aspect of the present invention, there is provided a fundus photographing apparatus according to the present invention, comprising: a display unit for displaying a fundus diagram by computer graphics; And displaying the fundus oculi diagram corresponding to one of the left and right eyes on the display means based on the detection of the detection means.

Further, the fundus photographing apparatus according to the present invention has a display means for displaying a fundus diagram by computer graphics, and a photographing means for photographing the fundus by changing the magnification. The display area of the fundus map is changed based on the following.

A fundus photographing apparatus according to the present invention for achieving the second object is a fundus photographing apparatus for displaying an anterior ocular segment, wherein an alignment mark for stereoscopic fundus photographing is displayed together with an anterior ocular segment image. Features.

Further, the fundus photographing apparatus according to the present invention has a display means for displaying a fundus map by computer graphics, and displays a fixation target position on the fundus map.

A fundus photographing apparatus according to the present invention for achieving the third object has a sliding mechanism for moving a subject's face cradle and an optical system with respect to a base, and performs observation by infrared light. In a fundus photographing apparatus that performs positioning and photographing with visible light, a light-shielding member provided around an objective lens of the optical system, and a light-shielding member fixed to the face receiving table and shielding at least external light from above are included. It is characterized by having.

[0016]

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 an embodiment, and shows a non-mydriatic retinal fundus photographing apparatus which observes an anterior eye part with infrared light and photographs a fundus oculi by viewing a fundus diagram of computer graphics. On an optical path from the strobe light source 1 to the objective lens 2, a lens 3, a light splitting member 4 for splitting a focused light beam, a lens 5, a perforated mirror 6, a visible light and a part of infrared light, and an observation light path A light splitting member 7 for splitting the light is sequentially arranged, and an LED light source 8 that emits infrared light having a wavelength of about 780 nm is arranged near the objective lens 2. On the optical path in the reflection direction of the reflection surface 4a of the light dividing member 4, a lens 9, a two-part wedge prism 10 conjugate to the pupil P, a lens 11, and a linear CCD 12 conjugate to the ocular fundus are arranged.

A lens 13 and an infrared television camera 14 are arranged in the reflection direction of the light splitting member 7, and a focusing lens 15 having a driving means 15a is provided on an optical path behind the perforated mirror 6, and a light splitting device. Member 16, lens 17,
A switching mirror 18, a field lens 19, a zoom lens 20 for changing a photographing magnification or a photographing range, and a color image pickup means 21 are sequentially arranged. A lens 22 and a focusing infrared LED light source 23 having a wavelength of about 850 nm are disposed in the incident direction of the light splitting member 16, and a liquid crystal plate in which elements are two-dimensionally arranged in the reflection direction of the switching mirror 18. 24,
A light source 25 for illuminating the liquid crystal plate 24 from behind is arranged.

The output terminals of the infrared television camera 14 and the color image pickup means 21 are connected to contact points 14a and 21a, respectively.
The display switch 26 of the display monitor 26 is alternatively connected to these contacts 14a and 21a.

FIG. 2 shows a configuration diagram of a control system. The arithmetic control means (CPU) 30 includes a zoom lens 20, a liquid crystal plate 24,
It is connected to a display monitor 26, a monitor display changeover switch 27, left and right eye change detection means 31 using a micro switch for detecting the left and right movement of the slide, a patient ID display input means 32, a strobe shooting switch 33, and a stereo shooting switch 34. ing.

FIG. 3 is a side view of a light-shielding member arranged near the face receiving table and the objective lens 2, and FIG. 4 is a plan view showing a watermark. A support 41 is fixed to a base 40 of the apparatus, and a forehead rest 42 is provided on an upper part of the support 41 and a chin support 4 is provided on a lower part.
A light-blocking member 44 for blocking external light from above is projected from the forehead pad 42.
In addition, a hanging curtain such as a curtain may be provided at the edge of the light shielding member 44 so that the light shielding is more complete.

An optical system housing 45 shown in FIG. 1 is mounted on the base 40 so as to be drivable in the left-right direction, and an objective lens barrel 46 is fixed to the front surface of the optical system housing 45. Have been. A support member 47 that is rotatable with respect to the lens barrel 46 is provided at a front portion of the lens barrel 46, and a light shielding member 48 for shielding external light around the lens barrel 46 is provided on the support member 47.
And a light blocking member 49 for blocking external light from the front to the other eye. The light shielding members 48 and 49
Is made of a flexible material, such as rubber, so that it does not hurt when touching the face.

With the above structure, the subject's face is put on the forehead 42
And one of the eyes is set in the objective lens barrel 46, and the examiner places the optical system storage unit 45 on the base 40.
Slide the top to align the optical axis. And infrared LED
When the light source 8 is turned on to illuminate the anterior segment of the eye E, the reflected light passes through the objective lens 2, is reflected by the light splitting member 7, and is transmitted to the infrared television camera 14 via the lens 13. E ′ is imaged and displayed on the display monitor 26 together with the alignment mark A. The examiner looks at the display monitor 26 in the state of (a), adjusts the focus by aligning the pupil P with the alignment mark A, and performs positioning.

Since the light shielding member 44 and the light shielding members 48 and 49 are separated on the face receiving side and the optical system side, there is a space for a hand for raising the eyelid, and the examiner looks at a part of the face. Therefore, positioning can be easily performed, and accurate positioning can be performed while looking at the enlarged anterior ocular segment image E ′.

On the other hand, the luminous flux of the infrared LED light source 23 is divided into a lens 22, a light splitting member 16, a focusing lens 15,
A light beam is projected from the center of the pupil P to the fundus R through the aperture of the perforated mirror 6, the light splitting member 7, and the objective lens 2. The reflected light returns to the optical path, is reflected by the perforated mirror 6, passes through the lens 5, and is reflected by the reflection surface 4a of the light dividing member 4.
The light passes through the lens 9, the split wedge prism 10, and the lens 11, and forms an image on the linear CCD 12 as two light beams.

From this signal, the interval between the two light beams is detected by the arithmetic control means 30, and the diopter of the eye E is detected. At the time of positioning, the focusing lens 15 is driven by the driving unit 15a based on the diopter, and focusing is automatically performed. As described above, the focusing optical system has no moving parts and the pupil P
Since the luminous flux passing through the periphery is used, accurate focusing can be performed even with infrared light.

At the time of positioning, the switching mirror 18 is used.
Are inserted in the optical path as shown in FIG.
The four two-dimensionally arranged elements are selectively turned on. The liquid crystal plate 24 is illuminated from behind by a light source 25,
From the switching mirror 18, the lens 17, the light splitting member 16, the focusing lens 15, and the perforated mirror 6.
The fixation target is presented to the eye E through the hole, the light splitting member 7 and the objective lens 2.

The examiner operates the liquid crystal panel 2 via the arithmetic control means 30.
4 is designated by a fixation target designating means (not shown),
A fundus diagram R ′ showing a fundus range photographed from a symbol generation circuit built in the arithmetic and control unit 30 based on the position information.
Is generated and displayed on the small screen 26a at the lower right of the display monitor 26.

In the fundus diagram R 'of this computer graphic, a mark M indicating the position of the fixation target based on the designated position is displayed in a portion corresponding to the macula as shown in FIG. By manipulating the fixation target designating means, the position of the target on the liquid crystal panel 24 and the display fundus range based on the fundus map R ′ can be changed.

At the time of photographing, the switching mirror 18 jumps up from the optical path, and the strobe light source 1 emits light. The strobe light from the light source 1 passes through the lens 3, the light dividing member 4, the lens 5, the perforated mirror 6, the light dividing member 7, and the objective lens 2, and illuminates the fundus R. The reflected light returns along the same optical path, and includes a perforated mirror 6, a focusing lens 15, and a light splitting member 1.
6, the fundus image R 'is once formed on the lens 17 and the field lens 19, and re-formed on the color imaging means 21 by the zoom lens 20. Display switch 27 simultaneously with shooting
Is switched from the contact point 14a of the infrared television camera 14 to the contact point 21a of the color image pickup means 21, and a still image of the captured fundus image R 'is displayed on the display monitor 26 in the state (b).

When photographing the opposite eye, the support member 4
7 is rotated 180 degrees around the lens barrel 46 together with the light shielding member 49, and the optical system housing part 45 is moved in the left and right direction on the base 40 to switch between the left and right eyes. The movement is detected by the left and right eye switching detecting means 31, and based on the detection result, the fundus diagram R 'of the small screen 26a is changed and displayed. Note that the fundus oculi diagram R ′ of the left and right eyes is symmetrical about the macula.

The imaging magnification or the imaging range is changed by the zoom lens 20, the fundus diagram R 'of the small screen 26a is changed according to the control signal, and the fundus diagram R' within the imaging range is displayed. In this manner, the fundus oculi view R 'in the correct photographing range can be displayed regardless of switching between the left and right eyes and zooming.

In the case of stereo photography, a stereo photography switch 34 shown in FIG. 2 is pressed. As shown in FIG. 5, alignment marks AR and AL deviated left and right by a predetermined amount about the optical path are sequentially displayed on the anterior eye image E ′, and the pupil P is sequentially aligned with the alignment marks AR and AL and photographed. I do. Since the size of the alignment marks AR and AL represents the pupil diameter necessary for stereoscopic imaging, it can be determined whether the mydriasis is sufficient, and by adjusting the pupil P to the alignment marks AR and AL sequentially, a certain Stereo shooting at the base line length can be performed. A shift direction display F is displayed together with the alignment marks AR and AL, and it is possible to know in which direction the optical system housing unit 45 has been shifted for shooting.

At the time of photographing, an ID number D or the like is input by the patient ID display input means 32 shown in FIG. If the mydriatic agent is not instilled, the first retinal image R 'is stored in the built-in memory together with the ID number D, since the first retinal image R' is stored in the built-in memory, and the pupil is often waited. Then, the other fundus image R 'is photographed. The arithmetic control unit 30 retrieves the previous image based on the ID number D, synthesizes a fundus image R ′ shifted in the left-right direction, and displays it on the display monitor 26 as one stereo image as shown in FIG. Observe the video with appropriate stereo glasses.

[0034]

As described above, the fundus photographing apparatus according to the present invention displays the corresponding fundus map on the display means based on the detection result of the left and right eyes of the eye to be examined, so that when the left and right eyes change or when the photographing is performed. Even when the magnification changes, a correct fundus diagram can be displayed by computer graphics.

Further, the fundus photographing apparatus according to the present invention changes the display area of the fundus diagram based on the control signal of the photographing means for photographing the fundus at a variable magnification so that the right and left eyes change and the photographing magnification changes. The correct fundus map can be displayed by computer graphics.

The fundus photographing apparatus according to the present invention displays an alignment mark for stereoscopic fundus photographing together with the anterior ocular segment image. It is possible to shoot with a constant shift amount.

The fundus photographing apparatus according to the present invention displays the fixation target position on the fundus diagram by computer graphic, so that when the stereoscopic fundus is sequentially photographed, even if the eye moves, the slide base is shifted. It is possible to shoot with a constant amount.

The fundus photographing apparatus according to the present invention is provided with a light-shielding member provided around the objective lens and a light-shielding member fixed to the face support to shield external light from at least the upper part. Using a non-mydriatic retinal camera for positioning, it is possible to take an image even in a bright room, and since the position of the face is known, an instruction to raise the eyelids can be given.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an optical system according to an embodiment.

FIG. 2 is a configuration diagram of a block circuit.

FIG. 3 is a side view of the light blocking member.

FIG. 4 is a plan view.

FIG. 5 is an explanatory diagram of a display monitor screen at the time of stereoscopic imaging.

FIG. 6 is an explanatory diagram of a stereoscopic fundus image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strobe light source 4, 7, 16 Light splitting member 8, 23 Infrared LED light source 10 2-split wedge prism 12 Linear CCD 14 Infrared television camera 21 Color imaging means 24 Liquid crystal board 25 Illumination light source 26 Display monitor 30 Arithmetic control means 31 Left and right eye switching detection means 32 Patient display input means 42 Forehead pad 43 Jaw rest 44, 48, 49 Light shielding member 45 Optical system storage

Claims (5)

[Claims] 1. A fundus diagram corresponding to one of the right and left eyes based on detection of the left and right eyes based on the detection by the detection unit. Is displayed on the display means. 2. A display device for displaying a fundus diagram by computer graphics, and a photographing device for photographing the fundus with magnification, wherein a display area of the fundus diagram is displayed based on a control signal by the magnification of the photographing device. A fundus photographing apparatus characterized by changing the following. 3. A fundus photographing apparatus for displaying an anterior ocular segment, wherein an alignment mark for stereoscopic fundus photographing is displayed together with an anterior ocular segment image. 4. A fundus photographing apparatus, comprising: display means for displaying a fundus map by computer graphics, and displaying a fixation target position on the fundus map. 5. A fundus photographing apparatus comprising a sliding mechanism for moving a subject's face support and an optical system with respect to a base, performing observation position adjustment by infrared light and photographing by visible light, A fundus photographing apparatus comprising: a light-blocking member provided around an objective lens of a system; and a light-blocking member fixed to the face support and blocking at least external light from above.