JP4607310B2 - Fundus camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In particular, the present invention relates to a fundus camera that performs alignment with respect to a subject's eye using corneal reflection of the subject's eye.
[0002]
[Prior art]
In order to observe or photograph the fundus using the fundus camera, it is necessary to perform an alignment operation that adjusts the relative position between the fundus camera and the eye to be examined. Usually, in this alignment, the anterior eye portion of the eye to be examined and the fundus force mela are aligned, and then the fundus camera and the fundus camera are more precisely aligned.
[0003]
In this alignment, the cornea reflection image of the alignment light source is formed in the vicinity of the anterior ocular segment of the eye to be examined in the alignment with the anterior ocular segment of the eye to be examined (anterior ocular segment alignment), and the fundus of the eye to be examined in the alignment with the ocular fundus of the eye to be examined (fundus alignment). And adjusting the position of the camera while observing these images through a monitor or an observation optical system.
[0004]
After the alignment with the anterior ocular segment of the eye to be examined, when shifting to the alignment with the fundus oculi of the eye to be examined, the positional relationship between the eye axis and the optical axis of the eye fundus camera obtained by the alignment with the anterior ocular segment of the eye to be examined was maintained. In addition to the configuration to move the fundus camera closer to the eye to be examined in a state and reduce the distance between the eye to be examined and the fundus camera, the optical system is used for alignment with the anterior eye portion to be examined without moving the fundus camera A configuration is also known in which the anterior ocular lens that has been inserted into the lens is detached from the optical path.
[0005]
[Problems to be solved by the invention]
Among the above-described conventional configurations, the configuration for switching the alignment with the anterior eye portion of the eye to be examined and the alignment with the fundus oculi of the eye to be examined by detaching the anterior eye lens from the optical path has the following problems.
[0006]
In other words, the left eye and the right eye have opposite cornea orientations with respect to the fundus camera, so when trying to align using a bright spot due to a virtual image of the cornea reflection of the eye to be examined, the observation screen is viewed from the anterior eye portion. When switching to the fundus, the center of the left eye and right eye is shifted at least.
[0007]
This will be described with reference to FIGS. FIG. 6 shows an outline of the main part of the optical system of the eye E (left eye) and the fundus camera from below. Here, only the objective lens LO and the anterior eye lens LF are shown as the optical system of the fundus camera.
[0008]
In the vicinity of the objective lens LO, there are provided LEDs (light emitting diodes) A and B for forming a corneal reflection image (virtual image) as a working dot in the vicinity of the anterior eye part of the eye E during alignment of the anterior eye part, and an optical system. A fundus conjugate alignment index OF for forming a cornea reflection image (virtual image) on the fundus of the eye E as a working dot at the time of fundus alignment is provided at an appropriate position inside.
[0009]
The fundus conjugate alignment index OF is constituted by a combination of an appropriate light source and a mask or an optical fiber. Although illustration of details is omitted here, two fundus conjugate alignment markers OF are also arranged in the horizontal direction so that two marker images are projected onto the fundus.
[0010]
In addition, internal fixation lamps LED (C) and (D) for guiding the line of sight of the eye E are provided inside the optical system. The internal fixation lamp LEDs (C) and (D) are for the left eye and the right eye, respectively, depending on whether the left eye or the right eye is being examined through an appropriate lighting control mechanism. Is turned on, and the line of sight of the eye to be examined is guided in an appropriate direction according to the left and right sides of the eye to be examined. Usually, the internal fixation lamp LEDs (C) and (D) for the left eye and the right eye are arranged so that the line of sight of the subject's eye faces the center of the subject's body rather than the front of the subject. Is done.
[0011]
At the time of anterior segment alignment, the anterior segment lens LF is inserted into the optical path by a mechanism (not shown), and in this state, cornea reflection images (virtual images) of the LEDs (A) and (B) are displayed in front of the eye E. It is formed near the eye, and the position of the camera is adjusted while observing this image through a monitor or an observation optical system.
[0012]
Then, the anterior eye lens LF is removed from the optical path when shifting to fundus alignment, and this time, the position of the camera is determined using a cornea reflection image (virtual image) of the fundus conjugate alignment index OF formed on the fundus of the eye E to be examined. Will be adjusted.
[0013]
At the time of this fundus alignment transition, the anterior eye lens LF is detached from the optical path, and the magnification of the optical system changes, so that the optical path of the internal fixation lamp LED (C or D in the case of the right eye) is as shown in FIG. The state changes from a state indicated by a broken line to a state indicated by a solid line.
[0014]
FIG. 7 shows changes in the fundus projection position of the internal fixation lamp LEDs (C to D) corresponding to the observation visual field when the optical system is switched. That is, the fundus projection position of the internal fixation lamp LED (C or D) moves from P1 in FIG. 7A to P2 in FIG. 7B.
[0015]
In response to this, the subject looks at the eye E to try to project the image of the internal fixation lamp LED (C or D) unconsciously at the position of the most sensitive macular region on the fundus. It moves like the arrow of 6.
[0016]
6 and 7 show the case of the left eye, the movement of the line of sight of the eye E to be examined is in the opposite direction to the camera with the right eye (both the lines of sight of the left eye and the right eye are examined). Move to the inside (nose side) of the person's body).
[0017]
Therefore, for example, for the left eye, the anterior segment is first aligned so that the virtual images A ′ and B ′ of the LEDs (A) and (B) are at the center of the iris as shown in FIG. When the anterior ocular lens LF is detached and the fundus is shifted to the alignment of the fundus, one of the virtual images OF ′ of the fundus conjugate alignment index OF deviates from the field of view as shown in FIG. End up.
[0018]
As described above, when switching to the fundus screen to perform alignment at the fundus after completion of alignment at the anterior ocular segment to be examined, there is a problem that the left and right alignment must be performed again on the fundus screen. there were.
[0019]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems and to align the eye to be examined and the fundus camera extremely easily and accurately regardless of the right and left sides of the eye to be examined.
[0020]
[Means for Solving the Problems]
In order to solve the above-described problem, according to the present invention, from the eye cornea of the first light source disposed at a position optically conjugate with the vicinity of the anterior segment with the anterior segment lens inserted in the optical system. The fundus camera and the eye to be inspected are aligned using the virtual image of the reflection of the eye, and then the anterior eye lens is detached from the optical system, and the object of the second light source disposed at a position optically conjugate with the fundus is detected. In the fundus camera for aligning the fundus camera and the eye to be examined using a virtual image of reflection from the optometry cornea, 1 A light source for the left eye and a right eye is provided as the light source for the left eye and the right eye. 1 The position of the light source is offset in the opposite direction from the optical axis of the optical system by a distance corresponding to the movement of the line of sight of the left and right eyes as the anterior eye lens is detached, and depending on the left and right of the eye to be examined For the left eye and right eye 1 The configuration in which the position of the light source is switched and used (Claim 1) or the optimal alignment state of the virtual image of the reflection from the eye cornea of the first light source in the field of the observation optical system where the examiner observes the eye to be examined A mark that indicates a corresponding position is formed, and the position of the mark is changed to a position corresponding to the movement of the line of sight of the left and right eye when the anterior eye lens is detached according to the right and left of the eye to be examined (claim) Item 5) was adopted.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0022]
[First Embodiment]
FIG. 1 shows the side and back of a fundus camera employing the present invention. The illustrated fundus camera body 10 is configured to be able to move on the gantry 12 in the front-rear and left-right directions and in the up-down direction with respect to the subject 13 by operating the operation lever 11 and the operation ring 11 a attached thereto. The fundus camera body can be rotated in the horizontal plane around the eye to be examined, and can also be rotated in the vertical plane around the axis 10a. The forehead is applied to the forehead pad 10b, and the chin rest 10c is applied to the chin rest 10c. Positioning (alignment) can be performed with respect to the eye 13a of the subject 13 seated with his / her chin.
[0023]
In this alignment, as will be described later, first, the examiner observes a virtual image due to corneal reflection of the eye to be examined 13a of LEDs 1, 2, 3, and 4 as an alignment light source for anterior segment alignment, and operates the operation lever 11. This is performed by moving the fundus camera body 10 relative to the eye 13a to be examined.
[0024]
The arrangement order and positions of the LEDs 1, 2, 3, and 4 for anterior segment alignment will be described later, but LEDs 1 and 4 are used when inspecting the left eye, and LEDs 2 and 3 are used when inspecting the right eye, respectively. To be controlled.
[0025]
Therefore, as shown on the right side of FIG. 1, switches SW 1 and SW 2 including limit switches for detecting the operation state of the gantry 12 are provided, and the gantry of the retinal camera is operated by the operation lever 11. When the 12 slider 14 is moved to the right side of the figure to inspect the left eye, the LEDs 1 and 4 are lit, and when the slider 14 of the gantry 12 is moved to the left side of the figure to inspect the LED 2 and 3 is lit up. SW1 and SW2 also control lighting of internal fixation lamp LEDs (C) and (D) described later in synchronization with the switching of the left eye / right eye.
[0026]
FIG. 2 shows the structure of the optical system of the fundus camera of FIG. The lower part of FIG. 2 shows the structure of the illumination system. A lamp LA, which is an observation light source, is arranged at the center of the mirror M1, and the light emitted from this lamp cuts the condenser lens L1, visible light, and infrared rays. Reflected by a total reflection mirror M2 through a filter F that passes only light or near-infrared light and a condenser lens L2, and subsequently reflected by a total reflection mirror M3 having a hole with a hole in the center through relay lenses L3 and L4. Then, the light enters the fundus Er from the pupil Ep of the eye E through the objective lens L5.
[0027]
The reflected light from the fundus Er is received again from the pupil Ep through the objective lens L5, passes through the focusing lens L6 and the imaging lens L7 through the hole of the perforated total reflection mirror M3, and enters the mirror M4. . The light reflected by the mirror M4 passes through the lens L8, is reflected by the mirror M6, then forms an image on the CCD via the lens L9, and the image can be observed on the monitor M.
[0028]
In addition, a strobe SR, which is a light source for photographing, is disposed between the filter F and the lens L2 in order to photograph a fundus image. At this time, when photographing a fundus image on the 35 mm film F1, the mirror M4 is removed from the optical path, and the fundus image is guided onto the film F1. Also Polaroid Camera (registered trademark) , The mirror M6 is removed from the optical path and the fundus image is This Polaroid Camera (registered trademark) To the film F2.
[0029]
In addition, internal fixation lamp LEDs (C) and (D) are provided to guide the line of sight of the eye E, and light from these LEDs passes through the lens L10, the mirror M8, and the lens L11, and is a perforated total reflection mirror. The light enters the mirror M9 disposed between M3 and the imaging lens L6, and is projected onto the fundus Er via the perforated total reflection mirror M3 and the lens L5.
[0030]
The internal fixation lamp LEDs (C) and (D) are for the left eye and the right eye, respectively, as in the conventional example. Whether the left eye or the right eye is being examined by the SW1 and SW2 described above. Accordingly, one of the lights is turned on, and the line of sight of the eye to be examined is directed toward the center of the subject's body rather than the front of the subject according to the left and right sides of the eye to be examined.
[0031]
Between the perforated total reflection mirror M3 and the objective lens L5, an anterior eye that is inserted into the optical path during anterior segment alignment (or observation) via a mechanism (not shown) and leaves the optical path during fundus alignment (or observation). A partial lens LF is provided.
[0032]
The fundus camera is provided with alignment light sources LED5 and LED6 that generate near-infrared light, and an image of these light sources is formed on one end face of the optical fiber OF by the lens L20. The other end of the optical fiber OF is disposed at the center of the perforated total reflection mirror M3, and an image thereof is projected onto the eye E through the objective lens L5. At this time, a cornea reflection image (virtual image) of the other end of the optical fiber OF is formed on the fundus Er of the eye E. Note that the light sources LED5 and LED6 are arranged in the direction perpendicular to the paper surface of the drawing (corresponding to the left and right direction of the subject and the fundus camera), and thus are shown in an overlapping manner in FIG.
[0033]
Further, LEDs 1 to 4 are arranged in the vicinity of the objective lens L5 as alignment light sources that generate near-infrared light for anterior segment alignment. Among these, LEDs 1 and 4 are used for the left eye, and LEDs 2 and 3 are used for the right eye.
[0034]
In FIG. 2, the structure in the vicinity of the objective lens L5 is shown from below (as if looking up from the gantry side) for easy explanation, but the distance between the LEDs 1 to 4 used for the left eye and the right eye The distances between the LEDs 2 to 3 used are equal, and the LEDs 1 and 4 are arranged offset (shifted) on the right eye side and the LEDs 2 and 3 on the left eye side. FIG. 3A (or FIG. 4A described later) shows the arrangement of the LEDs 1 to 4 as viewed from the subject.
[0035]
The amount of offset of the LEDs 1 and 4 and the LEDs 2 and 3 from the optical axis of the camera is a distance that corresponds to the movement of the line of sight of the left and right eyes as the anterior lens LF is detached.
[0036]
Further, in FIG. 2, a diaphragm S1 is disposed in front of the LEDs 1 and 2, and a diaphragm S2 is disposed in front of the LEDs 3 and 4 so as to face the eye E, and the light sources LED1 to LED4 emitted from the diaphragms S1 and S2. Is reflected by the cornea of the eye to be examined, and a cornea reflection image (virtual image) is formed in the vicinity of the anterior eye portion.
[0037]
The LEDs 1 and 4 or the LEDs 2 and 3 for anterior segment alignment are controlled to be lighted according to the left / right movement of the gantry 12 as described above. That is, when the gantry 12 of the fundus camera is moved to the right side of the figure to inspect the left eye by the operation lever 11, the LEDs 1 and 4 are turned on, and the gantry 12 is moved to the left side of the figure to inspect the right eye. LED2 and 3 are lit up.
[0038]
Further, the anterior segment alignment LEDs 1 to 4 are lit at least during a period in which the anterior segment lens LF is inserted, and the fundus alignment LEDs 5 and 6 are at least in a period in which the anterior segment lens LF is detached. Control to turn on during At this time, there is a period in which both the LEDs 1 to 4 and the systems 5 and 6 are lit simultaneously in the transitional period from the anterior segment alignment to the fundus alignment, that is, the anterior segment alignment system and the fundus alignment system. It is desirable to configure so that all of the LEDs are not turned off.
[0039]
Next, the operation in the above configuration will be described in detail.
[0040]
First, the lamp LA is turned on, and the light from the lamp light source passes through the filter F via the mirror M1 and the lens L1, and is projected onto the fundus Er via the lenses L2 to L5, thereby illuminating the fundus Er.
[0041]
When inspecting the left eye, the fundus camera body 10 is moved to the position shown in FIG. 1 with respect to the gantry 12, whereby the switch SW 1 is closed and the LEDs 1 and 4 are lit. The images of the light sources of the LEDs 1 and 4 become virtual images due to corneal reflection and are observed as bright spots on the monitor M. When alignment is performed on the anterior segment that is easier to align than the fundus, a cornea reflection image of the LEDs 1 and 4 is formed near the anterior segment of the eye 13a to be examined, as shown in FIG. When the light sources of LEDs 4 and 1 are turned on, virtual images 20a and 20b corresponding to the light sources appear as bright spots near the center of the anterior segment.
[0042]
Further, in the right eye examination, LEDs 3 and 2 are turned on by the same control by SW2, and virtual images 20a and 20b (FIG. 3B) corresponding to these are formed.
[0043]
In this anterior segment alignment, bright spots 20a and 20b (formed by LEDs 1 and 4 for the left eye and LEDs 2 and 3 for the right eye) are formed. Regarding the adjustment in the front-rear direction of the fundus camera, since two bright spots 20a and 20b are formed, for example, when the fundus camera is brought close to the eye E, the state where the bright spots 20a and 20b approach each outside is monitored M. Observed at. If the direction in which the fundus camera approaches is coincident with the optical axis, the two bright spots 20a and 20b move evenly to the left and right, so even if the optical axis is shifted during the alignment, it is easy to grasp in which direction it has shifted. The alignment can be easily corrected.
[0044]
In FIG. 3 (B), the iris of the eye to be inspected is shown in the center for simplification, but actually, as shown in FIG. 3 (A), the LEDs 1 and 4 are arranged offset from the center, so the left In the eye case, as shown in FIG. 4A, the virtual images 20a and 20b are positioned symmetrically with respect to the center of the screen of the monitor M (the intersection of the vertical line VV ′ and the horizontal line HH ′ in the figure). When adjusted to, the iris I of the eye to be examined is offset to the right side of the screen, and in this embodiment, anterior segment alignment is achieved at this time.
[0045]
This misalignment of the iris I with respect to the camera is intended to compensate in advance for the movement of the line of sight of the left and right eye to be inspected as the anterior lens LF is detached.
[0046]
FIG. 4A shows the objective lens L5 and the LEDs 1 to 4 viewed from the subject side with the LEDs 1 and 4 lit.
[0047]
Subsequently, to enter fundus alignment, the anterior eye lens LF is released. As a result, as shown in FIG. 3C, the cornea reflection images (virtual images) of the LEDs 5 and 6 formed on the fundus Er appear as left and right separate bright spots 21a and 21b.
[0048]
As described above, in the present embodiment, the LEDs 1 and 4 or 2 and 3 for anterior segment alignment are arranged offset, and the anterior segment at the time of anterior segment alignment and switching to fundus alignment. Since the fundus camera is positioned at a position in anticipation of the movement of the line of sight of the subject eye caused by the removal of the lens LF, immediately after the removal of the anterior eye lens LF and the movement of the line of sight of the subject eye, FIG. As shown in 4 (B), the bright spots 21a and 21b by the LEDs 5 and 6 appear in the center of the fundus, and more precise alignment can be performed from this state. There is no need to redo the fundus alignment from a different position, and the fundus alignment can be completed accurately and easily in a short time regardless of the left or right of the subject's eye. It is possible.
[0049]
When the alignment is completed in this way, after the focus adjustment, the strobe SR is turned on, and the fundus image is displayed on the 35 mm film F1 or Polaroid Camera (registered trademark) Shoot on film F2. At this time, when shooting on the 35 mm film F1, the mirror M4 is detached from the optical path, Polaroid Camera (registered trademark) When photographing on the film F2, the mirror M4 is inserted into the optical path and the mirror M6 is detached from the optical path.
[0050]
When the LEDs 1 to 6 are turned on, these light sources blink at a predetermined cycle, so that the examiner can easily identify each bright spot. At this time, if the blinking cycle of the LEDs 1 to 4 is different from the blinking cycle of the LEDs 5 and 6, it is possible to identify which LED is lit, and alignment with good operability is possible. Moreover, the shape and arrangement of each LED can be made different so that the shape and arrangement of the bright spots 20a and 20b are different from the bright spots 21a and 21b. For example, the bright spots 20a and 20b have a round shape and the bright spots 21a and 21b have a square shape. The bright spots 20a and 20b appear in the direction shown in FIG. 21b may appear in a direction perpendicular to FIGS. 3C and 3D.
[0051]
In addition, the light sources LED1 and 2 can be used as light sources when observing or photographing the anterior segment of the eye to be examined.
[0052]
[Second Embodiment]
In the above embodiment, the left eye LEDs 1 and 4 and the right eye LEDs 2 and 3 are provided to form the anterior eye alignment working dots, and these sets are used for detachment of the eye lens. The left and right eye LEDs are switched according to the left and right sides of the eye to be examined. The configuration used is shown.
[0053]
However, as shown below, the LED that forms the working dot for anterior segment alignment is shared by the left and right eyes as before, and when the position is offset on the monitor screen, the anterior segment alignment is achieved. It can also be.
[0054]
In this case, the entire structure of the fundus camera may be the same as that shown in FIGS. 1 to 3, but the LEDs that form the working dots for anterior segment alignment are made common to the left and right eyes as before.
[0055]
For example, as shown on the right side of FIG. 5A, LEDs 1 ′ and LED 4 ′ that form working dots for anterior segment alignment are arranged with no offset with respect to the objective lens L5.
[0056]
In the case of the left eye, the bright spots 20a and 20b and the image of the iris I formed as virtual images of corneal reflection of the LEDs 1 ′ and 4 ′ are displayed on the screen of the monitor M as shown on the left side of FIG. An anterior ocular segment alignment achievement state is defined when the position is offset to the right from the center (intersection of the vertical line VV ′ and the horizontal line HH ′ in the figure).
[0057]
Of course, this misalignment of the iris I with respect to the camera is to compensate in advance for the movement of the line of sight of the left and right eyes as the anterior eye lens LF is detached, as in the previous embodiment.
[0058]
Then, in order to indicate the optimum positions of the virtual images 20a and 20b when the anterior segment alignment is achieved, for example, marks 20c and 20d such as () and () shown in FIG. Form with offset.
[0059]
Naturally, as shown in FIG. 5B, the marks 20c and 20d are formed by offsetting the right eye in the direction opposite to that in FIG. 5A.
[0060]
These marks 20c and 20d may be formed by image processing on the input image data of the monitor M, or may be displayed using an optical mechanism such as a bright frame.
[0061]
The display positions of the marks 20c and 20d may be switched according to whether the left or right eye is being examined by detecting the position of the gantry 12 via SW1 or SW2 (FIG. 1). Further, since the marks 20c and 20d are necessary only for anterior segment alignment, the marks 20c and 20d are controlled to be in a non-display state in synchronization with the removal of the anterior segment lens L5.
[0062]
As described above, the LED for forming the working dot for anterior segment alignment is made common to the left and right eyes as before, and when the position comes to an offset position on the monitor screen, the anterior segment alignment achievement state is set. Even with the configuration, the anterior fundus camera can be positioned in advance at a position that allows for the movement of the line of sight of the eye to be inspected caused by the detachment of the anterior ocular lens LF at the time of switching to the fundus alignment. Thus, there is no need to redo the fundus alignment again from the position shifted due to the movement of the line of sight due to the detachment of the anterior eye lens LF, and the fundus alignment can be completed accurately and easily in a short time regardless of the right and left of the eye to be examined.
[0063]
Needless to say, each of the modifications shown in the first embodiment can also be implemented in the present embodiment.
[0064]
【The invention's effect】
As is apparent from the above description, according to the present invention, the eye cornea of the first light source disposed at a position optically conjugate with the vicinity of the anterior segment with the anterior segment lens inserted in the optical system. The fundus camera and the eye to be examined are aligned using the virtual image of the reflection from the lens, and then the anterior eye lens is detached from the optical system, and the second light source disposed at a position optically conjugate with the fundus In the fundus camera for aligning the fundus camera and the eye to be examined using a virtual image of reflection from the eye cornea, 1 A light source for the left eye and a right eye is provided as the light source for the left eye and the right eye. 1 The position of the light source is offset in the opposite direction from the optical axis of the optical system by a distance corresponding to the movement of the line of sight of the left and right eyes as the anterior eye lens is detached, and depending on the left and right of the eye to be examined For the left eye and right eye 1 The configuration in which the position of the light source is switched and used (Claim 1) or the optimal alignment state of the virtual image of the reflection from the eye cornea of the first light source in the field of the observation optical system where the examiner observes the eye A mark that indicates a corresponding position is formed, and the position of the mark is changed to a position corresponding to the movement of the line of sight of the left and right eye when the anterior eye lens is detached according to the left and right of the eye By adopting Item 5), the anterior fundus camera is pre-positioned at a position in anticipation of the movement of the line of sight of the eye to be examined caused by the detachment of the anterior ocular lens when switching to the fundus alignment. This eliminates the need to redo the fundus alignment from the position shifted due to the movement of the line of sight due to the detachment of the anterior ocular lens as in the prior art. And easily excellent effect that it is possible to terminate the fundus alignment is obtained.
[Brief description of the drawings]
FIG. 1 is a side view showing an overview of a fundus camera of the present invention.
FIG. 2 is an arrangement diagram showing an arrangement of an optical system of a fundus camera.
FIG. 3A is an explanatory diagram showing the arrangement of an objective lens and an alignment light source, and FIGS. 3B and 3C are explanatory views showing images that appear on a monitor during anterior segment and fundus alignment.
FIGS. 4A and 4B show the state of the mark and working dot indicating the optimal position for anterior segment alignment, and FIG. 4B shows the state of the working dot during fundus alignment as an image that appears on the monitor during the alignment operation. FIG.
FIGS. 5A and 5B are explanatory diagrams showing images appearing on a monitor during an anterior segment alignment operation for the left eye and the right eye, respectively, in different embodiments of the present invention. FIGS.
FIG. 6 is an explanatory diagram showing a problem of line-of-sight movement in a conventional fundus camera.
FIG. 7 is an explanatory diagram showing movement of a projection point of an internal fixation lamp caused by line of sight movement in a conventional fundus camera.
FIG. 8 is an explanatory diagram showing an image that appears on a monitor when shifting to fundus alignment in a conventional fundus camera.
[Explanation of symbols]
10 Fundus camera body
11 Control lever
12 frame
LED1 to LED6 alignment light source (LED)
LEDC, LEDD internal fixation lamp
LF Anterior eye lens
L5 objective lens
M monitor
SW1, SW2 switch
20c, 20d mark
20a, 20b, 21a, 21b Bright spots

Claims (9)

Position of fundus camera and eye to be examined using virtual image of reflection from eye cornea of first light source arranged at position optically conjugate with the vicinity of anterior eye part with anterior eye lens inserted in optical system After that, the anterior eye lens is detached from the optical system, and the fundus camera and the object to be covered are used by using a virtual image of reflection from the eye cornea of the second light source disposed at a position optically conjugate with the fundus. In the fundus camera that aligns the optometry,
Provided for the left eye and right eye as the first light source,
The positions of the first light source for the left eye and the right eye are offset in the opposite direction from the optical axis of the optical system by a distance corresponding to the movement of the line of sight of the left and right eyes as the anterior eye lens is detached. And place
A fundus camera, wherein the position of the first light source for the left eye and the right eye is switched in accordance with the right and left of the eye to be examined.   2. The fundus camera according to claim 1, wherein the first and second light sources are controlled to be turned on or off in conjunction with insertion or removal of the anterior eye lens.   Provide an internal fixation lamp for the left eye and right eye of the eye to be examined, and switch the internal fixation lamp for the left eye and right eye according to the left and right sides of the eye to be examined. The fundus camera according to claim 1, wherein a line of sight of the optometry is guided.   The fundus camera according to claim 1, further comprising detection means for detecting left and right of the eye to be examined based on a position of a gantry camera mount. Position of fundus camera and eye to be examined using virtual image of reflection from eye cornea of first light source arranged at position optically conjugate with the vicinity of anterior eye part with anterior eye lens inserted in optical system After that, the anterior eye lens is detached from the optical system, and the fundus camera and the object to be covered are used by using a virtual image of reflection from the eye cornea of the second light source disposed at a position optically conjugate with the fundus. In the fundus camera that aligns the optometry,
A mark indicating the position corresponding to the optimum alignment state of the virtual image of the reflection from the eye cornea of the first light source is formed in the field of the observation optical system where the examiner observes the eye to be examined. A fundus camera characterized in that the position of the mark is changed to a position corresponding to the movement of the line of sight of the left and right eyes as the anterior eye lens is detached.   The fundus camera according to claim 5, wherein display or non-display of the mark is controlled in conjunction with insertion of an anterior ocular segment observation lens.   6. The fundus camera according to claim 5, wherein the first and second light sources are controlled to be turned on or off in conjunction with insertion or removal of the anterior eye lens.   Provide an internal fixation lamp for the left eye and right eye of the eye to be examined, and switch the internal fixation lamp for the left eye and right eye according to the left and right sides of the eye to be examined. The fundus camera according to claim 5, wherein a line of sight of the optometry is guided.   6. The fundus camera according to claim 5, further comprising detection means for detecting left and right of the eye to be examined based on a position of a gantry camera mount.

Images