JP2016128009A - Ophthalmologic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmologic apparatus, even when the apparatus body is largely deviated from a subject's eye, capable of shortening a time till completing the alignment.SOLUTION: The ophthalmologic apparatus includes: an optometry part capable of moving in the vertical, horizontal, and longitudinal directions with respect to a subject's eye; a TV camera 151 (152) photographing an anterior eye part of the subject's eye at a predetermined frame rate; and an image processing arithmetic circuit 110 that detects a clearance between the subject's eye and the optometry part from a frame image of the anterior eye part of the subject's eye to be output from the TV camera 151 (152). When the clearance detected by the image processing arithmetic circuit 110 is a predetermined distance or more, the frame rate of the TV camera 151 (152) is raised.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ophthalmologic apparatus including an optometry unit that is movable up and down, left and right, and front and rear with respect to an eye to be examined.

  2. Description of the Related Art Conventionally, an ophthalmologic apparatus that automatically performs alignment and then measures the eye refractive power of an eye to be examined is known (see Patent Document 1).

  Such an ophthalmologic apparatus is provided with a measurement unit that measures eye refractive power, an alignment detection unit that detects the alignment of the measurement unit with respect to the eye to be measured, A CCD camera or the like that images the anterior segment of the optometer is provided.

  In addition, this ophthalmic apparatus manually performs rough alignment in the XY direction and the Z direction so that the reticle image displayed on the TV monitor is located in the vicinity of the center of the pupil, and when the index image appears on the TV monitor, Automatic orientation alignment is performed.

Japanese Patent No. 3676055

  However, in such an ophthalmologic apparatus, if the measuring head is greatly displaced with respect to the eye to be examined, the anterior eye portion is not displayed on the TV monitor, and therefore the examiner cannot move the anterior eye portion to the TV monitor. It is necessary to adjust the measurement head (device main body) with respect to the eye to be inspected so as to be displayed above. In addition, even if the anterior segment is displayed on the TV monitor, if the reticle image displayed on the TV monitor is not aligned so as to be positioned near the center of the pupil, the index image does not appear on the TV monitor, and automatic alignment is performed. Not done. For this reason, it may take a long time to complete the alignment.

  An object of the present invention is to provide an ophthalmologic apparatus capable of shortening the time until alignment is completed even when the apparatus main body is largely deviated from the eye to be examined.

  According to the first aspect of the present invention, an optometry unit that is movable up and down, left and right, and back and forth with respect to the eye to be examined, an imaging unit that images the anterior eye part of the eye to be examined at a predetermined frame rate, and an output from the imaging unit Alignment detection means for detecting a separation distance between the eye to be examined and the optometry part from a frame image of the anterior eye part of the eye to be examined, and when the separation distance detected by the alignment detection means is a predetermined distance or more, The frame rate of the imaging means is increased.

  According to this invention, even when the apparatus main body is largely deviated with respect to the eye to be examined, it is possible to shorten the time until alignment is completed.

(A) is the side view which showed the external appearance of the fundus camera which is an ophthalmologic apparatus concerning this invention, (B) is the rear view of the fundus camera. It is the side view of the fundus camera which showed an example which moved the display part. FIG. 2 is a plan view schematically showing an optometric unit of the fundus camera shown in FIG. 1. FIG. 2 is an optical arrangement diagram showing an optical system of the fundus camera shown in FIG. 1. It is explanatory drawing which showed a pair of split parameter | index projected on the fundus. It is explanatory drawing which showed the split parameter | index at the time of a non-focusing. FIG. 2 is a block diagram illustrating a configuration of a control system of the fundus camera illustrated in FIG. 1. FIG. 6 is an enlarged explanatory view showing a state in which a split indicator is split. It is a time chart which showed operation of the principal part of a fundus camera. It is the time chart which showed the operation | movement of the principal part of the fundus camera of 2nd Example. It is the time chart which showed the operation | movement of the principal part of the fundus camera of 3rd Example.

  Hereinafter, an example which is an embodiment of a fundus camera which is an ophthalmologic apparatus according to the present invention will be described with reference to the drawings.

[First embodiment]
1 and 2, reference numeral 1 denotes a fundus camera according to the present invention. The fundus camera 1 is disposed in front of the base part 2 provided on the base K, the optometry part (apparatus body) 3 provided on the base part 2, and the optometry part 3. The chin receiving part 4 and the display part 6 provided in the optometry part 3 are provided. The chin rest portion 4 is provided with a forehead receiving portion 5 integrally therewith.

  A measuring optical system (measuring unit) 200 is provided inside the optometry unit 3 as indicated by a broken line.

  The optometry unit 3 can move in the left, right, up, down, and front and rear directions with respect to the eye to be examined, and the X, Y, Z motors (moving means) 101 to 103 (see FIG. 7)・ Moved up and down and back and forth.

  The display unit 6 displays the anterior segment of the subject during measurement and examination. As shown in FIGS. 1 and 2, the display unit 6 can be freely moved to a desired position.

In addition, TV cameras (imaging means) 151 and 152 are installed in front of both outer side portions 3A and 3B of the optometry unit 3 as shown in FIG. 3, and optical axes 151a and 152a of the TV cameras 151 and 152 are provided. And the optical axis 200a of the measurement optical system 200 are set so that the alignment is completed when the intersection point P at which the intersection intersects the corneal vertex Eca of the eye E (see FIG. 4). That is, the corneal apex Eca is also the alignment completion position of the optometry unit 3.
[Optical system]
As shown in FIG. 4, the measurement optical system 200 includes an illumination optical system 12 for illuminating the fundus oculi Ef of the eye E, a photographing optical system 13 for photographing the fundus oculi Ef, and an observation for the fundus oculi Ef. An observation optical system 14, an internal fixation target projection optical system 16 for projecting a fixation target onto the fundus oculi Ef to fixate the eye E, and a split for projecting a pair of split indices onto the fundus oculi Ef of the eye E And an index projection optical system 17.

  The illumination optical system 12 is mainly composed of a halogen lamp and a xenon lamp (not shown), a condenser lens 18, projection lenses 19 and 20, a perforated mirror 21 and the like. During observation, the fundus oculi Ef is generated by ring-shaped infrared light. Is illuminated via the objective lens 22, and the fundus oculi Ef is illuminated via the objective lens 22 with ring-shaped visible light during photographing.

  The photographing optical system 13 includes an objective lens 22, a perforated mirror 21, a focusing lens (focusing means) 23, a triangular prism 24, a field lens 25, a relay lens 26, and an image sensor 11A such as a CCD. It is roughly composed of

  The observation optical system 14 is provided so as to be branched from the photographing optical system 13, and generally includes a quick return mirror 28, a total reflection mirror 29, a TV relay lens 30, and an image pickup device 11 </ b> B such as a CCD.

  The internal fixation target projection optical system 16 is roughly composed of internal fixation target light sources 30a to 30e, a projection lens 36, a half mirror 37, and a quick return mirror 28. The internal fixation target light sources 30a to 30e are turned on independently. The internal fixation target light source 30a is turned on when photographing the central portion of the fundus oculi Ef, and the internal fixation target light sources 30b to 30e are turned on. When the peripheral part of the fundus oculi Ef is photographed, it is turned on.

  The split index projection optical system 17 is branched from the illumination optical system 12. The split index projection optical system 17 includes an index bar mirror 39, a projection lens 40, a reflection mirror 41, a pair of perforated plates 42 for forming split index light, a split light source (not shown), and the like. (Refer to, for example, Japanese Patent Laid-Open No. 9-66032 for the detailed configuration.)

  The split index projection optical system 17 is movable in the direction of the optical axis of the illumination optical system 12 and moves in conjunction with the focusing lens 23, as indicated by arrows in FIG. As shown in FIG. 5, the pair of split indexes 17a and 17a is obtained by photographing a central part image G1 corresponding to the central part including the posterior pole part (macular part) Bp of the eye E and the eye E being a normal eye. When getting, they are set to match each other.

  The focusing lens 23 is a reference position Op (see FIG. 4) when the central eye image G1 corresponding to the central part including the posterior pole part (macular part) Bp of the fundus oculi Ef is obtained by photographing. Is located. When the eye E is not a normal eye, when the focusing lens 23 is at the reference position Op, the pair of split indicators 17a and 17a are split as shown in FIG.

The split index projection optical system 17 and the focusing lens 23 are driven in the optical axis direction by a focusing drive circuit 43 shown in FIG. The focusing lens 23 can correct the diopter in the range from -15D (diopter) to + 15D (diopter).
[Control system]
FIG. 7 is a block diagram showing the configuration of the control system of the fundus camera 1. In FIG. 7, reference numeral 44 denotes an in-focus determination circuit. The in-focus determination circuit 44 detects the split amount of the pair of split indicators 17a and 17a shown in FIG. 6 based on the image signal output from the image sensor 11B. Thus, the focus of the fundus image is determined.

  That is, when the pair of split indicators 17a and 17a are displaced as shown in FIG. 6, the focus determination circuit 44 performs a specific scan on the amount of deviation δ between the split indicator 17a and the split indicator 17a as shown in FIG. It calculates and calculates | requires based on line S1, S2.

  Reference numeral 110 captures image signals output from the image sensors 151A and 152A of the TV cameras 151 and 152, and detects the alignment state of the optometry unit 3 with respect to the eye E by, for example, stereo matching processing based on the captured image signals. An image processing arithmetic circuit (alignment detection means) 192 is a control device (control means) for controlling a halogen lamp (not shown), the internal fixation target light sources 30a to 30e and the like based on the operation of the operation unit 94.

  The control device 192 displays the fundus image formed on the image pickup devices 11A and 11B on the monitor (display means) 6 and controls the focus drive circuit 43 based on the shift amount δ calculated by the focus determination circuit 44. The focusing lens 23 is moved along the optical axis direction of the photographing optical system 13 so that the amount of deviation δ is zero by driving. The split index projection optical system 17 is moved in the optical axis direction of the illumination optical system 12 in conjunction with the focusing lens 23. As a result, the pair of split indexes 17a and 17a are matched as shown in FIG. The driving of the lens 23 is stopped at the matching position.

Further, the control device 192 has drive control means 92A that drives the X, Y, Z motors 101 to 103 in accordance with the alignment state calculated by the image processing arithmetic circuit 110 to align the optometry unit 3. .
[Operation]
Next, the operation of the fundus camera 1 configured as described above will be described with reference to the time chart shown in FIG.

  First, the subject's chin (not shown) is placed on the chin receiving portion 4 and the forehead (not shown) is applied to the forehead receiving portion 5 to fix the subject's head. Next, when a power supply (not shown) is turned on and a start switch (not shown) is operated, the TV cameras 151 and 152 shown in FIG. 3 take an image of the anterior eye portion of the subject at a normal frame rate (30 fps). .

  The image processing arithmetic circuit 110 (see FIG. 7) captures one frame image output from the image sensors 151A and 152A of the TV cameras 151 and 152 (time t0 to t1), and calculates the alignment state from the captured one frame image. (Time t1 to t2).

  The calculation of the alignment state is performed by stereo matching processing. For example, the difference between the center position of the pupil image of the eye E to be examined imaged by the image sensor 151A and the reference position (for example, the image center position) of the eye image, and the center position of the pupil image of the eye E imaged by the image sensor 152A The difference between the position of the intersection P of the optometry unit 3 and the alignment completion position Eca (see FIG. 4) is obtained based on the difference between the eye position and the reference position (for example, the image center position) of the eye image.

  These calculation processes are performed within a period T1 in which the next one frame is output after the one frame image is captured.

  The control device 192 drives the X, Y, Z motors 101 to 103 based on the difference between the position of the intersection point P of the optometry unit 3 and the alignment completion position Eca obtained by the image processing arithmetic circuit 110, and thereby the optometry unit. 3 is moved to the alignment completion position Eca (time t2). That is, the optometry unit 3 is moved so that the intersection point P coincides with the alignment completion position Eca. At this time, when the difference between the position of the intersection point P of the optometry unit 3 and the alignment completion position Eca is 10 mm or more, the optometry unit 3 is moved at a high speed (for example, 2000 PPS).

  Further, the control device 192 changes the frame rate of the TV cameras 151 and 152 from 30 fps to 60 fps (time t2).

  The image processing arithmetic circuit 110 captures one frame image of each of the TV cameras 151 and 152 having a frame rate of 60 fps (time t2 to t3), and completes the alignment with the position of the intersection point P of the optometry unit 3 from the captured one frame image. The difference from the position Eca is obtained in the same manner as described above (time t3 to t4). In this calculation period T2, the control device 192 moves the optometry unit 3 while maintaining a high speed.

  When the difference between the position of the intersection point P of the optometry unit 3 and the alignment completion position Eca is 10 mm or more, the control device 192 continuously drives the X, Y, Z motors 101 to 103 to align the optometry unit 3 as it is at high speed. Move to the completion position (from time t4).

  The above operation is repeated until the difference between the position of the intersection point P of the optometry unit 3 and the alignment completion position Eca that is the apex of the cornea is less than 10 mm, and the optometry unit 3 until time t5 when the difference is less than 10 mm. Will be moved at high speed.

  During the high-speed movement period (time t2 to t5) of the optometry unit 3, the frame rate of the TV cameras 151 and 152 is increased to 60 fps, so that the movement of the optometry unit 3 can be corrected quickly.

  When the difference between the position of the intersection point P of the optometry unit 3 and the alignment completion position Eca is smaller than 10 mm (time t5), the control device 192 moves the optometry unit 3 to the alignment completion position Eca at a low speed (for example, 500 PPS). The frame rate of the TV cameras 151 and 152 is returned from 60 fps to 30 fps.

  Further, the control device 192 turns on a halogen lamp (not shown) of the illumination optical system 12 and the internal fixation target light source 30a to illuminate the fundus oculi Ef and projects the fixation target. The split index projection optical system 17 projects a pair of split indices 17a and 17a onto the fundus oculi Ef (time t5).

  On the other hand, the image processing arithmetic circuit 110 captures one frame image of 30 fps output from the image sensors 151A and 152A of the TV cameras 151 and 152 (time t5 to t6), and the next one frame from the captured one frame image. The alignment state is calculated and obtained within the period T3. The difference between the position of the intersection point P of the optometry unit 3 and the alignment completion position Eca is smaller than 10 mm, and the position of the intersection point P is not within the predetermined alignment allowable range centering on the corneal vertex Eca that is the alignment completion position. At this time, the low-speed movement of the optometry unit 3 is continued, and the optometry unit 3 is moved so that the position of the intersection P coincides with the alignment completion position Eca.

  The above operation is repeated until the intersection point P of the optometry unit 3 falls within a predetermined alignment allowable range.

  On the other hand, the control device 192 operates the focus determination circuit 44 during the low-speed movement of the optometry unit 3. The focus determination circuit 44 obtains a shift amount δ between the pair of split indicators 17a and the pair of split indicators 17a shown in FIG. 8 based on the image signal output from the image sensor 11B.

  The control device 192 drives and controls the focus driving circuit 43 based on the shift amount δ obtained by the focus determination circuit 44, and moves the focusing lens 23 so that the shift amount δ becomes zero.

  When the position of the intersection point P of the optometry unit 3 falls within the allowable alignment range, the control device 192 stops driving the X, Y, and Z motors 101 to 103 and stops the movement of the optometry unit 3 (time t7). .

  When the movement of the optometry unit 3 is stopped, the shift amount δ of the pair of split indicators 17a can be made zero, so that it can be focused almost simultaneously with the stop of the movement of the optometry unit 3. When this focusing is completed, photographing of the fundus oculi Ef is executed.

  As described above, since the alignment of the optometry unit 3 is performed based on the image of the eye E to be imaged by the TV cameras 151 and 152 provided outside the optometry unit 3, the optometry unit with respect to the eye E to be examined. Even if 3 is greatly displaced, auto-alignment can be performed. Moreover, when the difference between the intersection point P of the optometry unit 3 and the corneal apex Eca is 10 mm or more, the optometry unit 3 is moved at high speed, so that alignment can be performed in a short time, and the frames of the TV cameras 151 and 152 Since the rate is increased from 30 fps to 60 fps, the movement of the optometry unit 3 can be corrected quickly, and unnecessary overrun can be prevented.

  In addition, when the difference between the intersection point P of the optometry unit 3 and the alignment completion position Eca is smaller than 10 mm, the frame rate of the TV cameras 151 and 152 is lowered from 60 fps to 30 fps. The focusing processing operation can be performed in parallel. For this reason, focusing of the focusing lens 23 can be finished almost simultaneously with the completion of alignment. For this reason, it is possible to shorten the time from the start point to the photographing of the fundus oculi Ef.

Further, when the difference between the intersection point P of the optometry unit 3 and the alignment completion position Eca is smaller than 10 mm, the optometry unit 3 is moved at a low speed, so that the shaking of the optometry unit 3 when it stops is prevented. Can do.
[Second Embodiment]
FIG. 10 shows a time chart of the fundus camera of the second embodiment. The configuration of the optical system and the control system of the fundus camera of the second embodiment is the same as that of the first embodiment, and the description thereof is omitted.
[Operation]
The operation of the fundus camera of the second embodiment will be described with reference to the time chart of FIG.

  As in the first embodiment, the TV cameras 151 and 152 shown in FIG. 3 take an image of the anterior segment of the subject at a normal frame rate (30 fps), and the control device 192 (see FIG. 7) A halogen lamp (not shown) of the optical system 12 and the internal fixation target light source 30a are turned on to illuminate the fundus oculi Ef and project the fixation target. The split index projection optical system 17 projects a pair of split indices 17a and 17a toward the fundus oculi Ef.

  The image processing arithmetic circuit 110 captures one frame image output from the image sensors 151A and 152A of the TV cameras 151 and 152 (time t10 to t11), and thereafter, from the captured one frame image, the same as in the first embodiment. Thus, the alignment state is calculated and obtained (time points t11 to t12). That is, the difference between the intersection P (see FIG. 3) of the optometry unit 3 and the alignment completion position Eca (see FIG. 4) is obtained.

  On the other hand, the control device 192 operates the focus determination circuit 44 (time t10). As in the first embodiment, the focus determination circuit 44 obtains a deviation δ between the split index 17a and the split index 17a shown in FIG. 8 based on the image signal output from the image sensor 11B, and controls the control device 192. Controls the focus drive circuit 43 based on the deviation amount δ, and moves the focusing lens 23 so that the deviation amount δ becomes zero. That is, the focusing processing operation is performed from time t10.

  The control device 192 drives and controls the X, Y, Z motors 101 to 103 when the difference between the intersection point P of the optometry unit 3 obtained by the image processing arithmetic circuit 110 and the alignment completion position Eca is 10 mm or more. The part 3 is moved to the alignment completion position Eca at high speed (time t12).

  The image processing arithmetic circuit 110 captures one frame image output from the image sensors 151A and 152A of the TV cameras 151 and 152 (time t12 to t13), and thereafter, the intersection of the optometry unit 3 from the captured one frame image. The difference between P and the alignment completion position Eca is obtained (time t13 to t14). When this difference becomes 7 mm or less, the control device 192 drives and controls the X, Y, and Z motors 101 to 103 to move the optometry unit 3 in the alignment completion direction at a medium speed (for example, 1000 PPS) (from time t14). ).

  Further, the image processing arithmetic circuit 110 captures one frame image output from the image sensors 151A and 152A of the TV cameras 151 and 152 (time t14 to t15), and thereafter, from the captured one frame image, the optometry unit 3 The difference between the intersection point P and the alignment completion position Eca is obtained (time t15 to t16). When this difference is 5 mm or less, the control device 192 drives and controls the X, Y, and Z motors 101 to 103 to move the optometry unit 3 in the alignment completion direction at a low speed (from time t16).

  From time t16 to t17, the image processing arithmetic circuit 110 captures one frame image output from the image sensors 151A and 152A of the TV cameras 151 and 152. Thereafter, the image processing arithmetic circuit 110 obtains a difference between the intersection point P of the optometry unit 3 and the alignment completion position Eca from the captured one frame image (time points t17 to t18). When this difference falls within a predetermined alignment allowable range, the control device 192 stops driving the X, Y, Z motors 101 to 103 and stops the movement of the optometry unit 3 (time t18).

  By the way, the focus determination circuit 44 calculates the shift amount δ between the split index 17a and the split index 17a even during the movement of the optometric unit 3 from the time t10, and the control device 192 determines the focus lens based on the shift amount δ. 23 is moved. For this reason, focusing can be performed almost simultaneously with the movement stop of the optometry unit 3.

  According to the second embodiment, the moving speed of the optometry unit 3 is decreased stepwise as the difference between the intersection point P of the optometry unit 3 and the alignment completion position Eca decreases, so that alignment is performed in a short time. It is possible to prevent shaking when the optometry unit 3 is stopped.

  Further, since the frame rate of the TV cameras 151 and 152 is set to 30 fps, the control device 192 can perform the alignment operation and the focusing processing operation in parallel. The focusing of the lens 23 can be terminated. For this reason, it is possible to shorten the time from the start point to the photographing of the fundus oculi Ef.

In the second embodiment, the focusing operation is performed from time t10. Actually, the focusing lens 23 is moved in the focusing direction after the split index 17a starts to be projected onto the fundus oculi Ef. When the optometry unit 3 is largely deviated from the eye E, since the split index 17a is not projected onto the fundus oculi Ef, the focusing lens 23 is not moved, and the eye to be examined is detected by the split index projection optical system 17. Only split indicators 17a and 17a are projected toward E.
[Third embodiment]
FIG. 11 shows a time chart of the fundus camera of the third embodiment. The configuration of the optical system and control system of the fundus camera of the third embodiment is the same as that of the first embodiment, so that the description thereof is omitted.
[Operation]
In the third embodiment, similarly to the first embodiment, the TV cameras 151 and 152 take an image of the anterior segment of the subject at a normal frame rate (30 fps), and the TV cameras 151 and 152 at time t20 to t21. One frame image output from the image pickup devices 151A and 152A of 152 is captured, and an alignment state is calculated from the captured one frame image. That is, the difference between the intersection P (see FIG. 3) of the optometry unit 3 and the alignment completion position Eca (see FIG. 4) is obtained (time points t21 to t22).

  The control device 192 drives and controls the X, Y, and Z motors 101 to 103 so that the difference between the intersection point P of the optometry unit 3 obtained by the image processing arithmetic circuit 110 and the alignment completion position Eca becomes zero. The optometry unit 3 is moved so that the intersection point P coincides with the alignment completion position Eca (time t22 to t23).

  The above operation is repeated until the intersection point P falls within the alignment allowable range. That is, the optometry unit 3 is alternately moved and stopped.

  When the intersection point P falls within the allowable alignment range, the control device 192 stops driving the X, Y, Z motors 101 to 103 and stops the movement of the optometry unit 3 (time t24).

  In addition, the control device 192 operates the focus determination circuit 44 from the time point t20, and performs the focus processing operation and the alignment processing operation in parallel. When the alignment is completed (time t24), focusing of the focusing lens 23 is completed almost simultaneously with the completion.

  According to the third embodiment, since the optometry unit 3 is repeatedly moved and stopped, overrun can be reduced. The moving speed of the optometry unit 3 may be any of high speed, medium speed, and low speed.

  In the third embodiment, as in the second embodiment, the focusing lens 23 is actually moved in the focusing direction only after the split index 17a starts to be projected onto the fundus oculi Ef. On the other hand, when the optometry unit 3 is largely deviated, the split index 17a is not projected onto the fundus oculi Ef, so the focusing lens 23 is not moved, and the split index 17a is directed toward the eye E by the split index projection optical system 17. , 17a is only projected.

  In the above embodiments, the fundus camera has been described. However, the present invention is not limited to this, and other ophthalmologic photographing apparatuses may be used.

  The present invention is not limited to the above-described embodiments, and design changes and additions are permitted without departing from the spirit of the invention according to each claim of the claims.

1 Fundus camera (ophthalmic device)
3 Optometry unit 92 Control device 92A Drive control means 101 X motor (moving means)
102 Y motor (moving means)
103 Z motor (moving means)
110 Image processing arithmetic circuit (alignment detection means)
151 TV camera (imaging means)
152 TV camera (imaging means)

Claims (3)

An optometry unit movable up and down, left and right, and back and forth with respect to the eye to be examined;
Imaging means for imaging the anterior segment of the eye to be examined at a predetermined frame rate;
Alignment detection means for detecting the separation distance between the eye to be examined and the optometry part from the frame image of the anterior eye part of the eye to be examined output from the imaging means,
An ophthalmologic apparatus characterized by increasing the frame rate of the imaging means when the separation distance detected by the alignment detection means is a predetermined distance or more. An optometry unit movable up and down, left and right, and back and forth with respect to the eye to be examined;
Imaging means for imaging the anterior segment of the eye to be examined at a predetermined frame rate;
Alignment detection means for detecting a separation distance between the eye to be examined and the optometry part from the frame image of the anterior eye part of the eye to be examined output from the imaging means,
An ophthalmologic apparatus characterized by controlling a moving speed of the optometry unit in accordance with a separation distance detected by the alignment detection means. An optometry unit movable up and down, left and right, and back and forth with respect to the eye to be examined;
Imaging means for imaging the anterior segment of the eye to be examined at a predetermined frame rate;
Alignment detection means for detecting a separation distance between the eye to be examined and the optometry part from the frame image of the anterior eye part of the eye to be examined output from the imaging means,
The alignment detection means captures one frame image output from the imaging means, detects the separation distance based on the captured frame image during a period during which the next one frame image is output, and performs these operations. Performed every time a frame image is output from the imaging means,
An ophthalmologic apparatus characterized in that the optometric unit is moved based on a separation distance detected before capturing one frame image only during a period in which the alignment detection means captures one frame image.