JP2003079580A - Ophthalmic imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily achieve three-dimensional imaging of the fundus oculi of the eye to be examined. SOLUTION: A variable apex angle prism 1 is set at a first angle after preparations for three-dimensional imaging are finished, and the fundus oculi Er is illuminated from a position biased to the left from the center of the pupil Ep to perform first three-dimensional imaging. Next, the prism 1 is set at a second angle and the fundus oculi Er is illuminated from a position biased to the right from the center of the pupil Ep to take a second three-dimensional image. These images are recorded on a recording medium D by an image recording means 28, independently displayed on the monitor 30, and three-dimensionally displayed on a three-dimensional monitor 31.

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 Conventionally, in stereoscopic photography in ophthalmology, 1
Simultaneous stereoscopic shooting method that obtains left and right stereoscopic images at the same time by shooting once, shooting method that obtains left and right stereoscopic images by shifting the normal shooting device to the left and right, and a parallel plane plate in front of the objective lens. It is known to arrange the and change the angle to obtain left and right stereoscopic images.

[0003]

However, in the above-mentioned conventional example, the simultaneous stereoscopic photographing method requires two optical systems independently for photographing left and right images, which is complicated and expensive. Further, since the left and right images are simultaneously photographed from the pupil whose size is limited, it is difficult to separate the illumination light and the photographing light on the pupil, and it is difficult to simultaneously obtain a wide angle of view and a sufficient baseline length.

Further, the method of obtaining a stereoscopic image on the left and right by taking a picture twice by shifting a normal photographing device to the left and right takes a long time for photographing, and the time interval for photographing the stereoscopic image on the left and right is long, and therefore, the fundus of the eye. Changes due to rotation, etc., making it difficult to obtain an accurate stereoscopic image. Furthermore, photographing errors such as flare are likely to occur, and information that is not common to the two images, such as flare, hinders stereoscopic viewing.

Further, in the method of arranging a plane parallel plate in front of the objective lens and changing the angle for stereoscopic photographing, although the photographing can be performed easily in a short time, the plane plate in front of the objective lens is rotated. Therefore, it takes time to rotate, 1
It is impossible to continuously capture left and right stereoscopic images with a single alignment.

An object of the present invention is to solve the above-mentioned problems and to provide an ophthalmologic photographing apparatus capable of easily performing stereoscopic photographing.

[0007]

In order to achieve the above object, the present invention according to claim 1 provides an objective lens facing an eye to be inspected, a photographing aperture arranged behind the objective lens, the objective lens and In a fundus oculi observation device having a fundus photographing means for photographing the fundus through a photographing diaphragm and a fundus illuminating means for illuminating the fundus with light from a light source through the objective lens, between a subject eye and the objective lens. A variable apex prism for deflecting an optical axis provided, a deflection means for deflecting a deflection angle of the variable apex prism to change a projection position of the photographing diaphragm, and a control means for controlling light emission of the deflection means and the light source. It is an ophthalmologic photographing apparatus characterized by having.

According to a second aspect of the present invention, there is provided a photographing switch, and the control means comprises a first step of starting photographing by one operation of the photographing switch, and a first step of emitting light from the light source. A second step of acquiring an image, a third step of changing the deflection angle of the variable apex angle prism by a predetermined angle, a fourth step of emitting light from the light source to acquire a second image, and the first step. The ophthalmologic imaging apparatus according to claim 1, further comprising a fifth step of storing the second image in association with each other.

The present invention according to claim 3 is the ophthalmologic photographing apparatus according to claim 1, wherein the variable apex angle prism is arranged to be inclined with respect to the optical axis of the objective lens.

According to a fourth aspect of the present invention, there is provided electronic mask synthesizing means for invalidating image information obtained from an area other than the effective luminous flux, and the area of the electronic mask is set based on the deflection angle of the deflecting means. The ophthalmologic imaging apparatus according to claim 2, wherein:

According to a fifth aspect of the present invention, the electronic mask synthesizing means changes the inner diameter and / or the central position of the electronic mask or both based on the deflection angle of the deflecting means. It is the described ophthalmologic photographing apparatus.

According to a sixth aspect of the present invention, there is provided a size deflection means for changing the image size of the image obtained from the electronic mask composition means, wherein the size deflection means is such that the center position of the electronic mask is the image. The ophthalmologic imaging apparatus according to claim 4 or 5, wherein the size is changed so as to be the center of the.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a block diagram of a fundus camera embodying the present invention. On the optical path in front of the eye E to be inspected, a variable apex angle prism 1 incorporating a deflecting means for deflecting the apex angle, an objective lens 2, a perforated mirror 3, a photographing aperture 3a arranged in the hole, and movable on the optical axis. Focus lens 4, taking lens 5, color separation prism 6, image pickup devices 7b, 7r, 7
g are sequentially arranged to form a fundus imaging unit.

In the reflection direction of the perforated mirror 3, a relay lens 8, an infrared light cut filter 9 which is arranged so as to be insertable and removable and blocks infrared light, an aperture stop 10 having a ring-shaped opening, and a flash light source 11 for emitting flash light. An observation light source 14 including a visible light cut filter 12 that blocks visible light and transmits infrared light, a condenser lens 13, and a halogen lamp that emits constant light of visible light and infrared light is sequentially arranged.

The output signals of the image pickup devices 7b, 7r and 7g are
Each of them is a color balance adjusting means and is connected to the signal amplifying means 21b, 21r, 21g and the character generating means 22 which can individually change the amplification factor of each color, and further, the A / D converting section 23.
b, 23r, 23g and image memories 24b, 24r, 2
It is connected via a 4g image board 25b, 25r, 25g to an image control means 26 having memories 26a, 26b, 26c for adjusting image distortion.

The image control means 26 is a control means 27, MO,
Image recording means 2 for performing writing to or reading from a recording medium D capable of holding storage even when power is not supplied externally such as MD, DVD-RAM, VTR tape, hard disk, etc.
8. Connect to video RAM 29a, 29b. The video RAM 29a includes a monitor 30 and a video RAM 29b.
A stereoscopic display monitor 31 is connected to.

The control means 27 is connected to a selection switch 33 having a photographing switch 32, a stereo switch 33a for binocular photography, and a mono switch 33b for monocular photography, and the output of the control means 27 is a first capacitor 34a. The strobe light emission control circuit 34 having the second capacitor 34b is connected to the variable apex angle prism 1 and the infrared cut filter 9, and the output of the strobe light emission control circuit 34 is connected to the strobe light source 11.

FIG. 2 is a sectional view of the variable apex angle prism 1 with a variable apex angle, and is a sectional view in a plane perpendicular to the optical axis and the paper surface of FIG. A glass substrate 1c that forms an optical surface of the prism body 1a is held on a base 1b that supports the prism body 1a, and a glass substrate 1d that forms an optical surface on the opposite side with a space is held rotatably with respect to the base 1b. Rotating shaft 1
bind to e. A space between the two glass substrates 1c and 1d is filled with a highly viscous liquid 1f having a uniform refractive index such as silicon oil, and the periphery thereof is sealed with a deformable sealing material 1g.

A coil 1h is joined to one end of a rotatably held glass substrate 1d, a bar magnet 1i is passed through the center of the glass substrate 1d, and a coil 1h includes a triber 1j for deflecting the apex angle of the prism body 1a. Supply current. The coil 1h is held on the base 1b by a coil spring (not shown), and its initial position is adjusted so that the deviation angle θ of the optical axis A penetrating the prism body 1a on the paper surface becomes θ = 0.

Here, by supplying a voltage to the driver 1j, the coil 1h is displaced in the direction of the arrow in the figure, but the glass substrate 1d is rotated about the rotation axis 1e accordingly, and the deflection angle with respect to the optical axis A is changed. θ can be given. That is, the control means 27 controls the variable apex angle prism 1 by changing the voltage supplied to the driver 1j.

The center of rotation of the apex angle of this variable apex angle prism 1 is provided in the direction orthogonal to the drawing, and
The device itself is installed so as to be inclined with respect to the photographing optical axis as shown in FIG. The reason is that the light flux from the prism 1 is prevented from entering the objective lens 2 again.

The character generating means 22 synthesizes a black mask image M on the photographed fundus image, for example, as shown on the monitors 30 and 31 in FIG. Therefore, in the combined image, the flare portion around the fundus image is masked, and the eye E
Only the effective portion that matches the regular imaging range of the fundus Er of is displayed. The shape of the mask image M is obtained by calling the shape of the mask from the mask shape storage means 27a prepared in the control means 27. For example, three mask shapes are prepared, one of which is a regular mask for monocular photographing, and has a size concentric with the photographing optical axis and corresponding to a predetermined angle of view defined by the photographing optical system. 2 remaining
The two masks are prepared for the left and right images at the time of stereoscopic photography, and these two masks are slightly smaller than the above-mentioned regular mask, and are decentered by a predetermined amount with respect to the imaging optical axis.

First, in the case of taking a normal monocular image of the fundus Er, the mono switch 33b of the selection switch 33 is operated. Control unit 2 that detects the input to the mono switch 33b
7 charges only the capacitor 34a of the strobe light emission control circuit 34. The photographer sits the subject in front of the fundus camera, and first observes the fundus Er with infrared light while aligning the eye E with the fundus camera. In this observation state, the infrared light cut filter 9 is retracted outside the optical path.

The light emitted from the observation light source 14 is condensed by the condenser lens 13, only the infrared light is transmitted by the visible light cut filter 12, and passes through the photographing light source 11 and the aperture of the diaphragm 10 having a ring-shaped aperture. , Passes through the lens 8 and is reflected upward by the mirror portion around the perforated mirror 3,
Objective lens 2, variable apex angle prism 1, pupil E of eye E to be examined
The fundus Er is illuminated through p.

The image of the fundus Er which is illuminated with infrared light passes through the variable apex angle prism 1, the objective lens 2, the photographing diaphragm 3a, the focus lens 4 and the photographing lens 5, and the color separation prism 6 is formed.
Incident on. The color separation prism 6 guides infrared light and red light to the image pickup element 7r, blue light to the image pickup element 7b, and green light to the image pickup element 7g. Since the reflected light in this case is infrared light, the image pickup element 7r Only the output is converted into an electrical signal. This signal passes through the signal amplifying means 21r, is amplified to a predetermined amplification factor, and is input to the image board 25r.
It is written in the portion of the video RAM 29a corresponding to 0a and is displayed on the area 30a of the monitor 30.

The photographer adjusts the position of the optical system by using the operation means while looking at the fundus image on the monitor 30.
Further, the fundus image reflected in the region 30a is observed, the focus lens 4 is moved to perform focusing, and further detailed alignment and confirmation of the photographing range are performed. After the above-mentioned preparation for photographing is completed, the photographing switch 32 is operated to photograph a still image.

Upon detecting the input to the photographing switch 32, the control means 27 inserts the infrared light cut filter 9 into the optical path, starts the light accumulation of the image pickup devices 7r, 7g, 7b, and causes the strobe light emission control circuit 34 to operate. Shoot a picture by sending a light emission signal.

Strobe light emission control circuit 3 which receives the light emission signal
Reference numeral 4 sends a trigger signal to the strobe light source 11 to discharge the electric charge accumulated in the first capacitor 34a and emit light. The light flux emitted from the strobe light source 11 passes through the aperture of the diaphragm 10 having a ring-shaped aperture similarly to the observation light, the infrared light is removed by the infrared light cut filter 9, and the remaining visible light passes through the lens 8. , Is reflected upward by a mirror portion around the perforated mirror 3, and illuminates the fundus Er from the center of the pupil Ep via the objective lens 2 and the variable apex angle prism 1.

The fundus image illuminated in this manner is the pupil Ep.
Through the central portion of the variable angle prism 1, the objective lens 2, the photographing diaphragm 3a, the focus lens 4, the photographing lens 5 again.
After passing through, the light enters the color separation prism 6, is separated into red, green, and blue colors, forms an image on the image pickup devices 7r, 7g, and 7b, and is converted into an electric signal. Signal amplifying means 21r, 21
g and 21b adjust the color balance by amplifying these signals for each color by a predetermined amplification factor, and then these characters are masked by the character generating means 22 for monocular photographing. .

The image boards 25r, 25g and 25b are A
The / D converters 23r, 23g, and 23b convert the electric signals into digital image data, and memories 24r, 24g, and 2 in the image boards 25r, 25g, and 25b that are storage means.
4b, and these image data are stored in the image control means 26.
Thus, the distortion of the image is corrected according to the pattern stored in the memory 26a, the image is stored in the memory 26b, recorded on the recording medium D by the image recording means 28, and displayed on the area 30a of the monitor 30.

Therefore, the fundus image displayed in the region 30a is an image in which the image mask M is applied to the peripheral portion as shown in the figure. The shape and color of this mask can be selected at any time depending on its model and application. After that, the control means 27 separates the infrared light cut filter 9 from the optical path and ends the photographing.

FIG. 3A shows a positional relationship between the pupil Ep and the diaphragm 10 at the time of completion of alignment when stereoscopically photographing the fundus Er, and the images of the pupil Ep and the diaphragm 10 are concentrically arranged. At this time, the apex angle of the variable apex angle prism 1 is the initial angle θ = 0, and the optical axis A is not deflected. That is,
The two surfaces of the glass substrates 1c and 1d before and after the variable apex angle prism 1 are set to be perpendicular to the paper surface of FIG.

FIG. 3B shows the positional relationship between the pupil Ep and the diaphragm 10 when the variable apex angle prism 1 is at the first angle in stereoscopic photography, and the position of the diaphragm 10 is decentered to the left on the pupil Ep. . Further, FIG. 3C shows the positional relationship between the pupil Ep and the diaphragm 10 at the second angle of stereoscopic photography.
Above, the position of the diaphragm 10 is eccentric to the right.

The eccentric amount of the diaphragm 10 in (c) with respect to the position of the diaphragm 10 in FIG. 3 (b) corresponds to the base line length, and the photographing range on the fundus Er at this time is as shown in FIG. become. That is, the position of the illumination / observation light flux passing through the diaphragm 10 for stereoscopic photography also moves like 10L and 10R,
Since this is done by changing the apex angle of the variable apex angle prism 1, the range of the left and right fundus images imaged for stereoscopic photography is ER and EL as shown in FIG. It is for this reason that the mask shape storage means 27a of the control means 27 separately prepares a regular mask for monocular photography and a mask for stereoscopic photography. Accordingly, the size is set so that only the common portion EC photographed in both photographings can be observed.

For stereoscopic photography, the selection switch 3
3 stereo switch 33a is operated. Switch 33
The control means 27 that has detected the input to the a
Both a and 34b are charged. The photographer sits the subject in front of the fundus camera and aligns the eye E with the fundus camera while observing the fundus Er with infrared light. The light emitted from the observation light source 14 is condensed by the condenser lens 13, only the infrared light is transmitted by the visible light cut filter 12, the photographing light source 11, and the diaphragm 10 having a ring-shaped aperture.
, Passes through the lens 8, passes through the lens 8, and is reflected upward by the mirror portion around the perforated mirror 3, and illuminates the fundus Er through the objective lens 2, the variable apex angle prism 1, and the pupil Ep.

The fundus image illuminated with infrared light passes through the variable apex angle prism 1, the objective lens 2, the photographing diaphragm 3a, the focus lens 4 and the photographing lens 5 again, enters the color separation prism 6, and enters the image pickup device 7r. Is imaged on and converted into an electrical signal.
This signal passes through the signal amplifying means 21r and is amplified to a predetermined amplification factor, and the video R corresponding to the area 30a of the monitor 30 is obtained.
The area 30 of the monitor 30 is written in the portion of the AM 29a.
It is reflected in a.

The photographer adjusts the position of the optical system by using the operating means while looking at the fundus image on the monitor 30. Further, the fundus image reflected in the region 30a is observed, the focus lens 4 is moved to perform focusing, and further detailed alignment and confirmation of the photographing range are performed.

After the above-mentioned preparation for photographing is completed, the photographing switch 32 is operated to perform the stereoscopic photographing of a still image (first step). Control unit 2 that detects an input to the photographing switch 32
Reference numeral 7 inserts an infrared light cut filter 9 in the optical path, sets the variable apex angle prism 1 to a first angle for stereoscopic photography, starts light accumulation in the image pickup devices 7r, 7g, 7b, and emits strobe light. A light emission signal is sent to the control circuit 34 to perform the first stereoscopic shooting (second step).

Strobe control means 27 receiving the light emission signal
Sends a trigger signal to the strobe light source 11 to discharge the electric charge stored in the first capacitor 34a, thereby strobe light source 1
Emits 1. The light flux emitted from the strobe light source 11 passes through the aperture of the diaphragm 10 having a ring-shaped aperture similarly to the observation light, and the infrared light cut filter 9 removes the infrared light.
The remaining visible light passes through the lens 8, is reflected upward by the mirror portion around the perforated mirror 3, and passes through the objective lens 2 and the variable apex angle prism 1 to the left of the center of the pupil Ep as shown in FIG. The fundus Er is illuminated from the position 10L that is eccentric to.

The fundus image thus illuminated is shown in FIG.
As shown in (b), it passes through the imaging position 3aL of the photographic diaphragm 3a which is decentered to the left of the center of the pupil Ep, passes through the objective lens 2, the photographic diaphragm 3a, the focus lens 4 and the photographic lens 5 again, and then the color separation prism. It is incident on 6, is separated into respective colors of red, green, and blue, forms an image on the image pickup elements 7r, 7g, 7b, and is converted into an electric signal. Fundus E photographed at this time
The range of r is EL in FIG.

After the signal amplifying means 21r, 21g, 21b adjust the color balance by amplifying each color with a predetermined amplification factor, the character generating means 22 synthesizes these signals with the stereoscopic left image mask M. To be done. As described above, the size of the image mask M at this time is slightly decentered by a predetermined amount with respect to the photographing optical axis.

An image in which only the EC part can be observed from the photographed fundus EL is converted into digital image data by the A / D converters 23r, 23g, 23b of the image boards 25r, 25g, 25b. After that, the image is stored in the memories 24r, 24g, 24b, which are storage means, the image control means 26 corrects the distortion of the image according to the pattern stored in the memory 26a, and is stored in the memory 26b. At this time, in addition to the distortion correction, the overall image size is adjusted so that the image is distributed to the center of the image mask M, that is, the center of the fundus image. This can be replaced by simply converting the position of the image.

Next, the second image for stereoscopic photography is photographed. The control means 27 sets the apex angle of the variable apex angle prism 1 to the second angle, sends a signal to the strobe light emission control circuit 34, sends a trigger signal to the strobe light source 11, and discharges the electric charge stored in the capacitor 34b. The strobe light source 11 emits light. The light emitted from the strobe light source 11 passes through the same optical path as above, and illuminates the fundus Er from a position 10R which is eccentric to the right side of the center of the pupil Ep as shown in FIG. The fundus image illuminated in this manner has a pupil Ep as shown in FIG.
Imaging position 3 of the photographic diaphragm 3a which is eccentric to the right of the center of
aR, the objective lens 2, the photographing diaphragm 3a, the focus lens 4, the photographing lens 5 again, and the color separation prism 6
Incident on, and is separated into respective colors of red, green, and blue, images are formed on the image pickup devices 7r, 7g, and 7b, and are converted into electric signals.
The range of the fundus imaged at this time is ER in FIG.

The signal amplifying means 21r, 21g and 21b adjust the color balance by amplifying these signals by a predetermined amplification factor for each color. After that, the stereoscopic right image mask is combined by the character generating means 22, and the image in which only the EC portion can be observed from the photographed fundus Er is converted into digital image data by the A / D converters 23r, 23g, and 23b. . This image is in memory 24
After being stored in r, 24g, and 24b, the image data is corrected by the image control means 26 according to the pattern stored in the memory 26a, and is stored in the memory 26c. At this time, in addition to the correction of the distortion, the entire image size is adjusted so that the image is distributed to the center of the image mask M, that is, the center of the fundus image.

The images stored in the memories 26b and 26c are recorded on the recording medium D by the image recording means 28, written in a portion corresponding to the area 30a of the video RAM 29a, and independently displayed on the monitor 30. At the same time, it is written in the video RAM 29b for a stereo monitor and stereoscopically displayed on the stereoscopic monitor 31. By viewing the image displayed on the stereoscopic monitor 31, the photographer can immediately observe the fundus stereoscopically without using glasses. At this time, since the stereoscopic image masks M are applied to the respective images, the fundus images displayed in the image mask M are at the same portion, and the center of the image mask M is adjusted, so that the observer can see both images. Fusion of images is easy and a stereoscopic image can be easily obtained, and accurate recognition is possible. Also,
By selectively viewing the left and right images independently displayed on the monitor 30, the flare and the difference in image brightness can be confirmed for each image.

The control means 27 returns the apex angle of the variable apex angle prism 1 to the initial position, removes the infrared light cut filter 9 from the optical path, and ends the photographing. FIG. 6 is a flow chart showing the above-mentioned photographing procedure. Here, the example in which the image distortion correction is sequentially performed after the end of each image is shown, but it goes without saying that this procedure may be executed at once after the end of the first and second photographing.

In the above-described embodiments, the case of a fixed base line length has been described. However, means for selecting the base line length is provided, and the deflection angle of the variable apex angle prism 1 is changed according to the selected base line length. By providing such a means, a good stereoscopic image can be obtained even for the eye E to be inspected having a small pupil diameter, and usability is improved.

[0048]

As described above, in the ophthalmologic imaging apparatus according to the first aspect, the variable apex angle prism whose apex angle can be changed is arranged in front of the objective lens, and the apex angle of the variable apex angle prism is changed. By performing stereoscopic photography, a fundus image with a wide angle of view can be stereoscopically photographed with a sufficient base line length.

In the ophthalmologic photographing apparatus according to the second aspect, since the stereoscopic photographing can be performed by one operation, the operation is simple and the stereoscopic image with high accuracy can be obtained. Stereoscopic photography is possible with a simple structure that changes the apex angle of the variable apex prism, so monocular photography and stereoscopic photography in one operation are possible without complicating the ordinary monocular photography apparatus. , The photographer no longer needs to have two fundus cameras.
Furthermore, since stereoscopic photography can be performed by simply moving the vertical angle by a small amount, stereoscopic photography can be performed with a short photographing interval.

In the ophthalmic photographing apparatus according to the third aspect, since the variable apex angle prism itself is installed so as to be inclined with respect to the photographing optical axis, the light flux from the variable apex angle prism is again provided to the objective lens 2.
It is possible to photograph the fundus of the eye without flare.

In the ophthalmologic imaging apparatus according to the fourth and fifth aspects, since the inner diameter of the area of the electronic mask is variable and the center position of the area is variable in accordance with the deflection angle, there is a fundus area that does not correspond to the right eye image. Not only does it not exist, but harmful light such as flare that tends to be generated by eccentric imaging can be removed, so that stereoscopic viewing is not hindered.

In the ophthalmologic photographing apparatus according to the sixth aspect, since the image size is changed according to the center position of the electronic mask, the stereoscopic vision is always performed under the same condition without giving an unreasonable vergence angle to the left and right eyes of the observer. Can be done. Furthermore, even when a tool dedicated to stereoscopic vision is used, individual image processing is not required, and the operation is easy and the device can be simplified. Further, since the unnecessary portion of the mask is cut off, the file size of the image can be reduced, and the operation for saving becomes simple.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a variable apex angle prism.

FIG. 3 is an explanatory diagram of a positional relationship between a pupil and a diaphragm and a fundus imaging range.

FIG. 4 is an explanatory diagram of fundus illumination light by a variable apex angle prism.

FIG. 5 is an explanatory diagram of a fundus imaging range.

FIG. 6 is a flowchart of a shooting operation.

[Explanation of symbols]

1 Objective lens 2 Variable apex angle prism 3 perforated mirror 4 focus lens 5 shooting lens 6 color separation prism 7r, 7g, 7b Image sensor 9 Infrared light cut filter 10 aperture 11 Strobe light source 12 Visible light cut filter 14 Observation light source 22 character generator 25r, 25g, 25b image board 26 Image control means 27 Control means 28 image recording means 29a, 29b Video RAM 30 monitors 31 stereoscopic monitor 32 shooting switch 33 Selection switch 34 Flash control circuit

Claims (6)

[Claims] 1. An objective lens facing an eye to be inspected, a photographing diaphragm arranged behind the objective lens, a fundus photographing unit for photographing a fundus through the objective lens and the photographing diaphragm, and the objective lens. In a fundus oculi observation device having a fundus illuminating means for illuminating the fundus with light from a light source, a variable apex angle prism for deflecting an optical axis is provided between an eye to be examined and the objective lens, and a deflection angle of the variable apex angle prism. An ophthalmologic imaging apparatus comprising: a deflecting unit that deflects the light beam to change the projection position of the imaging diaphragm; and a control unit that controls the light emission of the light source and the deflecting unit. 2. A photographing switch, and the control means,
A first step of starting shooting by one operation of the shooting switch, a second step of emitting light from the light source to obtain a first image, and changing a deflection angle of the variable apex angle prism by a predetermined angle. Performing a shooting operation including a third step, a fourth step of emitting the light source to obtain a second image, and a fifth step of storing the first and second images in association with each other. The ophthalmologic imaging apparatus according to claim 1, wherein the ophthalmologic imaging apparatus is characterized in that 3. The ophthalmologic imaging apparatus according to claim 1, wherein the variable apex angle prism is arranged so as to be inclined with respect to the optical axis of the objective lens. 4. An electronic mask synthesizing unit for invalidating image information obtained from a region other than an effective light beam, and the region of the electronic mask is set based on a deflection angle of the deflecting unit. Item 2. The ophthalmic photographing apparatus according to Item 2. 5. The ophthalmologic photographing apparatus according to claim 4, wherein the electronic mask synthesizing unit changes the inner diameter and / or the central position of the electronic mask based on the deflection angle of the deflecting unit. 6. A size deflecting unit for changing an image size of the image obtained from the electronic mask synthesizing unit, the size deflecting unit sized so that a central position of the electronic mask becomes a center of the image. The ophthalmologic imaging apparatus according to claim 4, which is changed.