JP2017153775A - Ophthalmologic examination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmologic examination device which can perform alignment by a super micromotion operation.SOLUTION: An ophthalmologic examination device 1 comprises: a substrate 11; an optometrical unit 12; a joy stick 13 having an operation rod 13a; a movement part 14 for moving the optometrical unit 12 according to inclination of the operation rod 13a; a detection part 15 for detecting a fact that an alignment index image enters a collimation range; and a control part 16 for controlling so that, when the operation rod 13a is in a micromotion range, a micromotion operation is performed, and when the operation rod 13a is in a flutter range, a flutter operation is performed, when it is detected that the alignment index image enters the collimation range, controlling so that a super micromotion operation is performed, in the super micromotion operation, a movement amount to change of an inclination angle of the operation rod 13a is smaller than that in the micromotion operation. As a result, by the super micromotion operation, the alignment can be performed more accurately.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an ophthalmic examination apparatus capable of performing coarse movement operation and fine movement operation with a joystick.

  In a conventional ophthalmic examination apparatus that operates with a joystick, a fine movement operation is performed in a range from the center position of the joystick to a predetermined tilt angle, and coarse movement is performed in a range where the tilt angle is larger than the predetermined tilt angle. What is operated is known (for example, refer to Patent Documents 1 and 2).

JP 2003-210404 A JP 2009-268682 A

  As described above, since the fine movement operation and the coarse movement operation can be performed, for example, when switching between the left and right eyes, the optometry unit is largely moved in a short time by the coarse movement operation, and the alignment with respect to the eye to be examined is performed. In some cases, the optometry unit could be moved finely by fine movement operation.

  However, when the operator (examiner) is performing a fine movement operation, there has been a desire to perform a finer operation in order to more accurately align the eye to be examined. Therefore, it is conceivable that a finer operation can be performed by reducing the amount of movement of the optometry unit with respect to the operation at the time of the fine movement operation. However, in such a case, since the maximum movement amount in the fine movement operation becomes small, it is necessary to roughly align by the coarse movement operation, and there is a problem that the operation becomes difficult.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an ophthalmic examination apparatus that enables an examiner to easily perform more accurate alignment.

In order to achieve the above object, an ophthalmic examination apparatus according to the present invention includes a base, an optometry unit that is movably mounted on the base, irradiates the eye to be examined with alignment light, and performs imaging and examination of the eye to be examined. A joystick with an operation rod that can be tilted in multiple directions, a moving unit that moves the optometry unit relative to the base in response to the tilting operation of the operation rod, and the alignment light imaged by the optometry unit When the corresponding alignment index image is within the aiming range centered on the center of the optical axis, and when the operating rod is in the fine movement range that is a predetermined tilt range from the center position, The moving unit is controlled so that the operation can be performed, and when the operating rod is in the coarse movement range that tilts more than the fine movement range, the coarse movement operation is performed with the joystick. When the movement unit is controlled so that the detection unit detects that the alignment index image has entered the aiming range, the movement amount with respect to the change in the tilt angle of the operating rod is smaller than the fine movement operation in the fine movement range. And a control unit that controls the moving unit so as to perform a superfine movement operation that becomes smaller.
With such a configuration, when the alignment index image enters the aiming range, the ultra fine movement operation is performed. Therefore, since the fine movement operation is performed when the alignment is close, the alignment can be achieved by the fine movement operation. Further, since the alignment can be achieved by the fine movement operation, the alignment becomes more accurate, and as a result, the measurement result and the like become more accurate.

Further, in the ophthalmologic examination apparatus according to the present invention, the control unit moves so that the ultrafine movement operation is performed on the basis of the tilted state of the operating rod when the detection unit detects that the alignment index image has entered the aiming range. The unit may be controlled.
With such a configuration, the fine movement operation can be seamlessly shifted to the super fine movement operation.

  According to the ophthalmologic examination apparatus according to the present invention, alignment can be performed by a fine movement operation, and more accurate alignment can be realized.

The perspective view which shows the external appearance of the ophthalmic examination apparatus by embodiment of this invention The block diagram which shows the structure of the ophthalmic examination apparatus by the embodiment The figure which shows the structure of the optical system of the ophthalmic examination apparatus by the embodiment The figure for demonstrating the fine movement range and coarse movement range in the embodiment The figure which shows an example of the boundary of the fine movement range / coarse movement range in the embodiment The figure which shows an example of the boundary of the super fine movement range and coarse movement range in the embodiment The figure which shows an example of the boundary of the fine movement range / coarse movement range in the embodiment The figure for demonstrating the fine movement operation in the embodiment The figure for demonstrating coarse movement operation in the embodiment The figure which shows an example of the display of the eye to be examined in the embodiment The figure which shows an example of the display of the eye to be examined in the embodiment The figure for demonstrating the super fine movement operation in the embodiment The figure for demonstrating the super fine movement operation in the embodiment The flowchart which shows operation | movement of the ophthalmic examination apparatus by the embodiment

  Hereinafter, an ophthalmic examination apparatus according to the present invention will be described using embodiments. In the following embodiments, components and steps denoted by the same reference numerals are the same or equivalent, and repetitive description may be omitted. The ophthalmic examination apparatus according to the present embodiment can perform a fine movement operation and a coarse movement operation. When the alignment index image falls within a predetermined range from the center of the optical axis, the fine movement is finer than the fine movement operation. The operation can be performed.

  FIG. 1 is a perspective view showing an appearance of an ophthalmic examination apparatus 1 according to the present embodiment, FIG. 2 is a block diagram showing a functional configuration of the ophthalmic examination apparatus 1, and FIG. It is a figure which shows the structure of this optical system. The ophthalmic examination apparatus 1 according to the present embodiment includes a base 11, an optometry unit 12, a joystick 13, a moving unit 14, a detecting unit 15, and a control unit 16.

The base 11 is fixed to a desk or a floor, for example. The base 11 may be provided with a subject guide having a chin rest, for example.
The optometry unit 12 is movably mounted on the base 11 and performs irradiation of alignment light onto the eye to be examined, and photographing and examination of the eye to be examined. The fact that the optometry unit 12 is movable with respect to the base 11 may be, for example, movable in the horizontal direction or may be movable in any three-dimensional direction. . Further, the optometry unit 12 is assumed to include an alignment light irradiation mechanism, an imaging unit having an imaging element such as a CCD or a CMOS, and the like. The alignment light is usually applied to the eye to be examined along the optical axis of the optometry unit 12. For example, the photographing unit may photograph the anterior segment of the eye to be examined. In addition, an anterior ocular segment image of the eye to be examined photographed by the photographing means may be displayed on the monitor 17. The monitor 17 may be, for example, a liquid crystal display or an organic EL display. The examination performed by the optometry unit 12 may be, for example, corneal shape measurement, ocular refractive power measurement, tonometry, or observation of the eye to be examined. (For example, fundus photography) or other ophthalmological examinations. Therefore, the ophthalmic examination apparatus 1 may be, for example, a keratometer, a refractometer, a refract keratometer, a tonometer, a fundus camera, or the like. Since the optometry unit 12 is already known, detailed description thereof is omitted.

  The joystick 13 has an operating rod 13a that can be tilted in multiple directions. For example, the operation rod 13a may be tiltable in two directions, tiltable in three or more directions, or tiltable in any direction. The joystick 13 having the operation rod 13a that can be tilted in two directions can be operated by tilting the operation rod 13a only in the first direction and the second direction orthogonal to the first direction, for example, like a cross lever. It may be possible. In the present embodiment, the case where the operation rod 13a can be tilted in any direction will be mainly described. It is assumed that the operation rod 13a of the joystick 13 can be tilted at least in the front-rear direction and the left-right direction. The front-rear direction is the optical axis direction of the optometry unit 12, and the left-right direction is a direction in the horizontal plane that is orthogonal to the front-rear direction. The front-rear direction of the examiner who operates the ophthalmic examination apparatus 1 shown in FIG. 1 is the front-rear direction, and the left-right direction of the examiner is the left-right direction. The joystick 13 also detects the tilt angle of the operating rod 13a. The detection may be performed, for example, by detecting the tilt angle in the front-rear direction of the operation rod 13a and the tilt angle in the left-right direction of the operation rod 13a. For the method of detecting such a tilt angle, see, for example, Patent Documents 1 and 2 described above. The joystick 13 may output the tilt angles in the front-rear direction and the left-right direction thus detected, or the tilt direction of the operating rod 13a calculated using these angles and the tilt direction. The tilt angle of the operation rod 13a may be output. The tilt direction may be indicated by, for example, an azimuth angle in which the tilt direction with the operating rod 13a is 0 °. A method of converting the tilt angle in the front-rear direction and the left-right direction into the tilt direction and the tilt angle in the tilt direction is already known, and detailed description thereof is omitted. The joystick 13 may be capable of performing an operation other than the tilting of the operation rod 13a. For example, the grip of the operating rod 13a may be rotated, the roller provided on the operating rod 13a may be rotated, or the switch provided on the operating rod 13a may be operated. The joystick 13 applies an urging force toward the fine movement range to the operation rod 13a when the operation rod 13a is in the coarse movement range, and such an urging force when the operation rod 13a is in the fine movement range. May not be hung on the operation rod 13a. For details of such a joystick 13, see, for example, Patent Documents 1 and 2 described above. The coarse movement range and the fine movement range will be described later.

  The moving unit 14 moves the optometry unit 12 relative to the base 11 in accordance with the tilting operation of the operating rod 13a. For example, the moving unit 14 may include means for moving the optometry unit 12 in the front-rear direction, the left-right direction, and the up-down direction, that is, the front-rear direction drive means, the left-right direction drive means, and the up-down direction drive means. . The vertical direction is a vertical direction and is a direction orthogonal to both the front-rear direction and the left-right direction. Moreover, each drive means may be comprised by the motor etc., for example. The moving unit 14 may move the optometry unit 12 in the front-rear direction and the left-right direction, for example, by tilting the operation rod 13a in the front-rear direction and the left-right direction. In this case, the moving unit 14 may move the optometry unit 12 in the vertical direction in accordance with, for example, the rotation operation of the grip of the operating rod 13a, the rotation operation of the roller, or the like. In addition, the moving unit 14 may move the optometry unit 12 in the up-down direction and the left-right direction by tilting the operating rod 13a in the front-rear direction and the left-right direction, respectively. In this case, the moving unit 14 may move the optometry unit 12 in the front-rear direction in accordance with, for example, the rotation operation of the grip of the operating rod 13a, the rotation operation of the roller, or the like. Moreover, the moving part 14 may perform other movement according to operation to the operating rod 13a. Note that the degree of movement of the optometry unit 12 by the moving unit 14 according to the coarse movement operation, the fine movement operation, and the ultrafine movement operation is different. This will be described later.

  The detection unit 15 detects that the alignment index image photographed by the optometry unit 12 has entered the aiming range. The alignment index image is an index image taken in response to the alignment light irradiation. The alignment with respect to the eye to be examined is performed using the alignment index image. The aiming range is a predetermined range around the center of the optical axis. That is, the center of the aiming range is the center of the optical axis. The aiming range may be, for example, a range indicated by a reticle mark used for alignment. Note that the reticle mark is sometimes called an alignment mark or an aiming mark, for example. Normally, alignment is completed when the alignment index image is at the center position of the reticle mark (that is, when it is at the center of the optical axis). Therefore, when a captured image of the eye to be examined is displayed on the monitor 17, a reticle mark and an alignment index image are also displayed along with the eye to be examined. The shape of the aiming range may be, for example, a square shape, a rectangular shape, a circular shape, or the like. The shape is preferably symmetrical with respect to the up and down direction and the left and right direction in the captured image. For example, the detection unit 15 identifies the position of the alignment index image in the captured image, and determines whether the identified position is within the aiming range, thereby detecting that the alignment index image is within a predetermined range. May be. That is, when the detection unit 15 determines that the specified position is within the aiming range, it detects that the alignment index image has entered the aiming range.

  The control unit 16 controls the moving unit 14 so that the fine movement operation is performed by the joystick 13 when the operating rod 13a is in a fine movement range that is a predetermined tilting range from the center position. Further, the control unit 16 controls the moving unit 14 so that the coarse movement operation is performed by the joystick 13 when the operating rod 13a is in the coarse movement range that is tilted more than the fine movement range. For example, as shown in FIG. 4, the range in which the operating rod 13a tilts from the center position to a predetermined angle is the fine movement range, and the range in which the operating rod 13a tilts more than that is the coarse movement range. The fine movement operation is a fine operation, and the coarse movement operation is a rough operation. For example, in the fine movement operation, the optometry unit 12 may be moved according to the movement of the operation rod 13a. That is, in the fine movement operation, when the operating rod 13a is stopped, the optometry unit 12 does not move. Then, in accordance with the movement of the operating rod 13a, the optometry unit 12 moves according to the change in the direction and tilt angle of the operating rod 13a. On the other hand, in the coarse movement operation, the optometry unit 12 may be moved according to the direction / tilt angle of the operation rod 13a. That is, in the coarse movement operation, even when the operation rod 13a is stopped, the optometry unit 12 continues to move. In addition, the speed of movement at that time may be increased as the degree of tilting of the operation rod 13a is increased, or may be constant regardless of the degree of tilting. In the present embodiment, the latter case will be mainly described.

  Further, the control unit 16 controls the moving unit 14 so that the fine movement operation is performed by the joystick 13 when the detection unit 15 detects that the alignment index image has entered the aiming range. The super-fine movement operation is an operation that is finer than the fine movement operation, and is an operation in which the movement amount with respect to the change in the tilt angle of the operation rod 13a is smaller than the fine movement operation. That is, the optical axis position of the optometry unit 12 can be operated more finely than the fine movement operation by the superfine movement operation. Further, when the super fine movement operation is performed, the control unit 16 controls the moving unit 14 so that the super fine movement operation is performed in the fine movement range. That is, the super fine movement operation is performed only in the fine movement range, and the coarse movement operation is performed in the coarse movement range. In addition, the control unit 16 controls the moving unit 14 so that the fine movement operation is performed based on the tilted state of the operation rod 13a at the time when the detection unit 15 detects that the alignment index image has entered the aiming range. Shall. That is, the fine movement operation is performed using the difference from the tilt angle of the operating rod 13a when the alignment index image is detected to be in the aiming range. Therefore, when the examiner is switched from the fine movement operation to the ultrafine movement operation, the examiner performs the ultrafine movement operation from the time of the switching without once performing an extra operation such as returning the operation rod 13a to the center position. Therefore, the fine movement operation and the ultrafine movement operation are continuously connected, and the operability is improved.

  Here, an example of the fine movement range and the coarse movement range will be described. When the joystick 13 detects the tilt angle in the front-rear direction and the left-right direction, the tilt angle in the front-rear direction is from −θ1 to θ1, and the tilt angle in the left-right direction is from −θ1 to θ1. The range may be a fine movement range, and the other range may be a coarse movement range. The tilt angle when the operating rod 13a is at the center position is 0 °. θ1 is an angle threshold corresponding to the boundary between the fine movement range and the coarse movement range, and is a positive real number. In this case, the fine movement range and the coarse movement range are as shown in FIG. 5A, for example. In FIG. 5A, the x-axis is the tilt angle in the left-right direction detected by the joystick 13, and the y-axis is the tilt angle in the front-rear direction detected by the joystick 13. In this case, when the detection unit 15 detects that the alignment index image has entered the aiming range, the fine movement range becomes the super fine movement range as shown in FIG. 5B. The threshold angle (θ1 in the above description) may be changed between the front-rear direction and the left-right direction.

  Next, an example of fine movement operation and coarse movement operation will be described. FIG. 6A is a diagram showing the relationship between the tilt angle of the operation lever 13a in the left-right direction in the fine movement range and the movement amount of the optometry unit 12 in the left-right direction. In FIG. 6A, when the tilt angle of the operation rod 13a in the left-right direction is in the range from −θ1 to θ1, it is proportional to the tilt angle of the operation rod 13a with reference to the center position of the operation rod 13a (tilt angle = 0 °). The optometry unit 12 is moved in the left-right direction by the moving unit 14 from -L1 to L1. It is assumed that the direction in which the movement amount is positive and the tilt angle are in the positive direction. Further, usually, the optometry unit 12 is moved in the tilting direction of the operating rod 13a. The relationship between the tilt angle in the front-rear direction and the amount of movement in the front-rear direction in the fine movement range is the same as that in FIG. 6A. In that case, the value of L1 etc. may not be the same as the left-right direction.

  FIG. 6B is a diagram showing the relationship between the tilt angle of the operation lever 13a in the left-right direction in the coarse movement range and the moving speed of the optometry unit 12 in the left-right direction. In FIG. 6B, in a range where the tilt angle of the operating rod 13a in the left-right direction is smaller than −θ1, the optometry unit 12 is moved by the moving unit 14 at a moving speed of −V1, and the tilt angle in the left-right direction of the operating rod 13a is greater than θ1. In a large range, the optometry unit 12 is moved by the moving unit 14 at a moving speed of V1. Note that θ2 is the maximum value of the tilt angle. Also, it is assumed that the direction in which the moving speed is positive is the direction in which the tilt angle is positive. In general, the optometry unit 12 is moved at a constant speed in the tilting direction of the operating rod 13a. The relationship between the tilt angle in the front-rear direction and the moving speed in the front-rear direction in the coarse movement range is the same as that in FIG. 6B. In that case, the value of V1 etc. may not be the same as the left-right direction.

  Next, an operation of the examiner when the detection unit 15 detects that the alignment index image has entered the aiming range will be described. FIG. 7A is a diagram illustrating an example of the anterior segment of the eye to be examined displayed on the monitor 17. As shown in FIG. 7A, the monitor 17 shows an alignment index image and a reticle mark. In this example, it is assumed that the square range indicated by the reticle mark is the aiming range. In the state of FIG. 7A, it is assumed that the examiner operates the operating rod 13a within the fine movement range and moves the optometry unit 12 so that the alignment index image falls within the reticle mark. 7B, the detection unit 15 detects that the alignment index image has entered the aiming range. As a result, the operation using the operation rod 13a by the examiner is switched from the fine movement operation to the super fine movement operation.

  The fine movement operation will be described with reference to FIG. 8A. FIG. 8A is a diagram showing a relationship between the difference in the tilt angle of the operation lever 13a in the left-right direction in the ultrafine movement range and the amount of movement of the optometry unit 12 in the left-right direction. The tilt angle difference is a difference from the tilt angle at the time when the alignment index image is detected to be in the aiming range. As shown in FIG. 8A, in the fine movement operation indicated by the solid line, the movement amount with respect to the change in the tilt angle of the operating rod 13a is smaller than in the fine movement operation indicated by the broken line. That is, the inclination of the movement amount with respect to the inclination angle is small. Therefore, even if the examiner tilts the operating rod 13a by the same angle, the movement amount in the fine movement operation is smaller than the movement amount in the fine movement operation. Further, in the fine movement operation, the amount of movement is not determined by the angle from the center position (tilt angle = 0 °), but the operation rod 13a is tilted when it is detected that the alignment index image has entered the aiming range. With the state as a reference, the amount of movement is determined by the difference in tilt angle from the reference tilt state. That is, the center position in the fine movement operation corresponds to the tilted state of the operation rod 13a at the time when the alignment index image is detected to be in the aiming range in the fine movement operation. Therefore, after detecting that the alignment index image has entered the aiming range, an ultra-fine movement operation is performed around the tilt angle at the time of detection. When the operating rod 13a is out of the fine movement range, that is, when the operating rod 13a enters the coarse movement range, the coarse movement operation is performed accordingly. Further, the relationship between the difference in tilt angle in the front-rear direction in the ultrafine movement range and the amount of movement in the front-rear direction is the same as in FIG. 8A.

  In addition, as described above, when the superfine movement operation is performed with reference to the tilted state of the operation rod 13a at the time when the alignment index image is detected to be in the aiming range, when the operation is shifted to the superfine movement operation. If the operating rod 13a is greatly tilted, the tilting direction cannot be moved so much by the ultrafine movement operation, and as a result, more accurate alignment may not be achieved. Specifically, as shown in FIG. 7B, when the operation rod 13a is close to the boundary between the fine movement range and the coarse movement range when it is detected that the alignment index image has entered the aiming range, Depending on the relationship between the tilt angle difference and the movement amount in the fine movement operation, the alignment index image may not be moved to the center of the reticle mark in the fine movement operation. Accordingly, the control unit 16 increases the amount of movement with respect to the change in the tilt angle in the fine movement operation as the tilt of the operation rod 13a at the time when the detection unit 15 detects that the alignment index image has entered the aiming range. The moving unit 14 may be controlled such that the smaller the tilt of the operating rod 13a at that time, the smaller the amount of movement with respect to the tilt angle change in the fine movement operation. That is, when the tilt of the operation rod 13a at the time when it is detected that the alignment index image has entered the aiming range, the control unit 16 moves the amount of movement as indicated by “ultra fine movement operation 2” in FIG. 8B. When the tilt of the operation rod 13a at the time when it is detected that the alignment index image is within the aiming range is small, the movement amount is controlled as shown by “ultra fine operation 1” in FIG. 8B. May be. By doing so, it is possible to increase the possibility that appropriate alignment can be achieved even when the tilt of the operation rod 13a is large when it is detected that the alignment index image has entered the aiming range. In addition, when the tilt of the operating rod 13a at the time when it is detected that the alignment index image has entered the aiming range, the movement control of the optometry unit 12 can be performed more finely. Here, the fact that the tilt of the operating rod 13a is large means that the tilt angle from the center position is large. The degree of tilting of the operating rod 13a at the time when the alignment index image is detected to be in the aiming range and the degree of movement with respect to the tilt angle change in the subsequent ultrafine movement operation are shown in FIG. 8B. As described above, it may be switched in two or more stages according to the degree of tilting of the operation rod 13a at the time when it is detected that the alignment index image has entered the aiming range, or the alignment index image is aimed. It may be continuously switched according to the degree of tilting of the operation rod 13a when it is detected that it has entered the range.

  Here, an example of the optical system of the optometry unit 12 will be described with reference to FIG. First, an optical system for measuring eye refraction will be described. The light emitted from the light source 130 passes through the mask 129, the light projecting lens 128, and the mask 127 to become a conical light beam. Thereafter, the light is reflected by the mirror 126, passes through the mirror 125, the mirror 107, and the lens 106, and projects a measurement pattern onto the fundus of the eye to be examined. The reflected light from the fundus of the eye to be examined passes through the lens 106, mirrors 107, 125 and 126, and the imaging lens 131 and is received by the CMOS sensor 132. A reflected image from the fundus of the eye to be examined is projected as it is onto the CMOS sensor 132 and detected as a ring-shaped pattern. The detected data is stored in a frame memory, and the pattern is analyzed by image processing, whereby SPH (spherical power), CYL (astigmatic power), and AX (astigmatic axis angle) are calculated. The SPH or the like may be displayed on the monitor 17 or printed.

  Next, an optical system for measuring the corneal curvature radius will be described. Light emitted from a plurality of light sources 105 arranged in an annular shape passes through the annular diffusion plate 104 and the lens 102 to become a ring-shaped light beam, and projects a measurement pattern onto the cornea of the eye to be examined. Reflected light from the cornea of the eye to be examined passes through the lens 106, is reflected by the mirror 107 and the mirror 108, passes through the lens 117, the filter 120, the diaphragm 121 and the imaging lens 122, and is received by the CMOS sensor 123. The On the CMOS sensor 123, the reflection image from the cornea of the eye to be examined is projected as it is, and is detected as a ring-shaped pattern. The detected data is stored in a frame memory, and further, R1 (weak main meridian), R2 (strong main meridian), and AX (angle) are calculated by analyzing the pattern by image processing. The R1 or the like may be displayed on the monitor 17 or printed.

  Next, an optical system for displaying a visual target will be described. The light emitted from the light source illuminates the target 111, the light passes through the lens 110, is reflected by the mirror 109, passes through the mirror 108, is reflected by the mirror 107, and passes through the lens 106. Projected onto the eye. When the subject gazes at the target 111, the collimation direction of the subject can be fixed, and appropriate measurement or the like can be performed.

  Next, an optical system for monitoring the eye to be examined will be described. For monitoring the eye to be examined, light emitted from the light source 101 illuminates the eye to be examined. Then, the reflected light is received by the CMOS sensor 123 in an optical system that also serves as a light receiving system for measuring the corneal curvature radius. That is, the reflected light passes through the lens 106, is reflected by the mirror 107 and the mirror 108, passes through the lens 117, the filter 120, the diaphragm 121 and the imaging lens 122, and is received by the CMOS sensor 123. Then, an image of the eye to be examined is displayed on the monitor 17. The light emitted from the alignment light source 124 is reflected by the mirror 125, passes through the mirror 107 and the lens 106, and is irradiated to the eye to be examined. The alignment light reflected by the eye to be examined (the center of the pupil) passes through the lens 106, is reflected by the mirror 107, is reflected by the mirror 108, and is reflected by the lens 117, filter 120, diaphragm 121, and imaging lens 122. , And reaches the CMOS sensor 123. The received alignment light is displayed on the monitor 17 as a bright spot (alignment index image) for aiming the optical axis of the optical system to the center of the eye to be examined.

  In addition, although FIG. 3 demonstrated the case where the optometry unit 12 performed an eye refraction degree measurement or a corneal curvature radius measurement, as mentioned above, it cannot be overemphasized that the measurement performed in the optometry unit 12 is not limited to them. The optometry unit 12 may perform only one of these measurements, or may perform other measurements (for example, intraocular pressure measurement or fundus photography).

Next, the operation of the ophthalmic examination apparatus 1 will be described using the flowchart of FIG. In this flowchart, a case where the fine movement range and the coarse movement range become the super fine movement range will be described.
(Step S <b> 101) The control unit 16 determines whether a movement instruction is accepted by the joystick 13. For example, when the operation rod 13a of the joystick 13 is tilted, the control unit 16 may determine that the movement instruction has been accepted. If a movement instruction is accepted, the process proceeds to step S102, and if not, the process proceeds to step S107.

  (Step S102) The control unit 16 determines whether the operating rod 13a of the joystick 13 is in the coarse movement range or the fine movement range. If it is within the coarse movement range, the process proceeds to step S103. If it is within the fine movement range, the process proceeds to step S104.

  (Step S103) The control unit 16 controls the moving unit 14 so that the coarse movement operation is performed in accordance with the movement instruction received by the joystick 13. In accordance with the control, coarse movement operation is performed. Then, the process returns to step S101. Note that when a coarse operation is performed, the alignment index image is usually out of the aiming range. Therefore, when the coarse motion operation is performed while the super fine motion operation is set, the super fine motion operation setting may be canceled.

  (Step S <b> 104) The control unit 16 determines whether or not the setting for the ultrafine movement operation has been performed. Then, if the setting of the ultrafine movement operation is performed, the process proceeds to step S105, and if not, the process proceeds to step S106.

  (Step S <b> 105) The control unit 16 controls the moving unit 14 so that the fine movement operation is performed in accordance with the moving instruction received by the joystick 13. In accordance with the control, an ultrafine movement operation is performed. Then, the process returns to step S101.

  (Step S106) The moving unit 14 is controlled so that a fine movement operation is performed in accordance with the movement instruction received by the joystick 13. A fine movement operation is performed according to the control. Then, the process returns to step S101.

  (Step S107) The detection unit 15 determines whether the alignment index image has entered the aiming range. If the alignment index image enters the aiming range, the process proceeds to step S108, and if not, the process proceeds to step S109.

  (Step S <b> 108) The control unit 16 sets the ultrafine movement operation. This setting is a setting for performing the ultrafine movement operation in response to the subsequent acceptance of the movement instruction. For example, “1” may be set to a flag indicating whether or not the ultrafine movement operation is performed. . It is assumed that the flag is “1” when the super fine movement operation is set, and “0” otherwise. Then, the process returns to step S101.

  (Step S109) The optometry unit 12 determines whether or not a measurement instruction is received by the joystick 13. If a measurement instruction is accepted, the process proceeds to step S110. If not, the process returns to step S101. The measurement instruction may be received, for example, by pressing a measurement button of the joystick 13 or the like.

  (Step S110) The optometry unit 12 performs measurement on the eye to be examined. The measurement result may be displayed on the monitor 17, printed, or accumulated in a memory or the like. Further, the optometry unit 12 may perform photographing of the eye to be examined instead of measurement. Then, the process returns to step S101. Note that after this measurement is performed, the fine movement operation may be released and the fine movement operation or the coarse movement operation may be performed.

  Note that this flowchart only includes processing for switching from the fine movement operation to the ultrafine movement operation. For example, the detection unit 15 detects that the alignment index image is out of the aiming range during the fine movement operation. In some cases, the ultrafine movement operation may be canceled.

  As described above, according to the ophthalmologic examination apparatus 1 according to the present embodiment, when the alignment index image enters the aiming range, the super fine movement operation is performed. For this reason, the super fine movement operation is performed only when the position is close to the alignment, and in other cases, the fine movement operation and the coarse movement operation are performed. At the same time, more accurate alignment can be realized by the fine movement operation. In addition, the fine movement operation is performed seamlessly based on the tilting state of the operation rod 13a at the time when the alignment index image is detected to be in the aiming range. Thus, the operability of the examiner is improved. Further, by changing the amount of movement with respect to the change of the tilt angle in the fine movement operation according to the degree of tilt of the operation rod 13a at the time when the alignment index image is detected to be in the aiming range, the tilt at that time is changed. Even when the degree of is large, the alignment can be appropriately performed. Further, when the aiming range is the range indicated by the reticle mark, the examiner can know the approximate timing of switching to the ultra-fine movement operation while performing the operation while looking at the monitor 17. Therefore, it is preferable that the aiming range matches the range indicated by the reticle mark.

  In the present embodiment, as shown in FIG. 5A, the case where the boundary between the fine movement range and the coarse movement range is rectangular has been described, but this need not be the case. As shown in FIG. 5C, the boundary between the fine movement range and the coarse movement range may be circular. In that case, for example, when the operating rod 13a is tilted in a certain tilting direction, the movement according to the first quadrant of FIGS. 6A and 6B is performed in the tilting direction. Even in this case, when the operating rod 13a is tilted only in the left-right direction or the front-rear direction, the same control as in the case of the boundary shown in FIG. 5A is performed.

  Further, in the above-described embodiment, a case has been described in which the ultrafine movement operation is performed based on the tilted state of the operation rod 13a at the time when the alignment index image is detected to be in the aiming range. Good. For example, when it is detected that the alignment index image has entered the aiming range, the examiner is notified that the operation has shifted to the fine movement operation (for example, a notification on the monitor 17 or a predetermined sound output) Thereafter, the movement operation of the optometry unit 12 according to the operation rod 13a may be stopped until the examiner returns the operation rod 13a to the center position. Then, after the operating rod 13a is returned to the center position, the fine movement operation may be performed.

  In addition, the ophthalmic examination apparatus 1 according to the above embodiment may perform only manual operation, or may perform both manual operation and auto operation. The manual operation is to take alignment with the joystick 13. In the auto operation, when the optometry unit 12 is moved to a position where the pupil of the eye to be examined is displayed on the monitor 17, the position of the pupil is detected on the apparatus side, alignment is automatically performed, and measurement is performed. It is. Even an apparatus that performs an automatic operation can usually perform a manual operation. Therefore, in the manual operation in such an auto-operable device, the above-described ultrafine movement operation may be performed.

  In the above-described embodiment, each component may be configured by dedicated hardware, or a component that can be realized by software may be realized by executing a program.

  Further, the present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that these are also included in the scope of the present invention.

  As described above, according to the ophthalmic examination apparatus according to the present invention, an effect that a more accurate alignment can be realized is obtained. For example, the ophthalmic examination apparatus is useful as an ophthalmic examination apparatus that performs eye refraction measurement or the like.

DESCRIPTION OF SYMBOLS 1 Ophthalmic examination apparatus 11 Base 12 Optometry unit 13 Joystick 13a Operation rod 14 Moving part 15 Detection part 16 Control part 17 Monitor

Claims (1)

The base,
An optometry unit that is movably mounted on the base, irradiates the eye to be examined with alignment light, and performs imaging and examination of the eye to be examined;
A joystick having an operation rod that can be tilted in multiple directions;
A moving unit that moves the optometry unit with respect to the base in response to a tilting operation of the operating rod;
A detection unit that detects that the alignment index image according to the irradiation of the alignment light, which is photographed by the optometry unit, has entered the aiming range centered on the optical axis center;
When the operation rod is in a fine movement range that is a predetermined tilt range from the center position, the moving unit is controlled so that the fine movement operation is performed by the joystick, and the operation rod is tilted to a greater extent than the fine movement range. When the movement unit is controlled so that the coarse movement operation is performed by the joystick, and the detection unit detects that the alignment index image has entered the aiming range when the movement is within the coarse movement range that is a range And a control unit that controls the moving unit so that the amount of movement with respect to a change in the tilt angle of the operating rod is smaller than that in the fine moving operation in the fine moving range. apparatus.

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