JP2010233998A - Ophthalmological apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ophthalmological apparatus allowing an operator to position an eye of a subject to be examined and the apparatus more easily in a shorter time. <P>SOLUTION: The ophthalmological apparatus includes: an inspection unit having an imaging means to image an anterior ocular segment of the subject to be examined and an inspection optical system; an XY moving means to move the inspection unit in a horizontal direction (X direction) and vertical direction (Y direction) toward the eye of the subject to be examined; a display to display an image of the anterior ocular segment thereon; a pointing device to designate a point on a screen of the display; a drag detection means to detect a moving direction, a moving amount, and a moving speed when the designated point is dragged in a predetermined area set on the screen of the display; and a control means to control driving of the XY moving means based on the moving direction, the moving amount, and the moving speed of the dragged designated point. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ophthalmologic apparatus for aligning an inspection unit having an inspection optical system (an optical system for measuring, observing, and photographing a subject's eye) with respect to the subject's eye.

  In an ophthalmologic apparatus provided with an inspection optical system for measuring, observing, or photographing a subject's eye, a camera (imaging means) that images the anterior segment of the subject's eye, and a display that displays the captured anterior segment image The inspection unit in which the inspection optical system is arranged is moved by inputting a movement signal with an operation member such as a joystick and a rotary knob while observing the anterior segment image displayed on the display, and the subject's eye (See, for example, Patent Document 1).

  In addition, by using a display provided with a touch panel and the examiner touching and specifying the position on the screen of the display, the anterior eye portion displayed at the specified position is preset in the screen An apparatus in which an inspection unit is automatically moved so as to be displayed at a position has been proposed (see, for example, Patent Document 2).

JP 2005-287752 A JP-A-2005-323712

  However, the operation of a joystick or the like for inputting a movement signal requires skill, and it is difficult for an examiner who is unaccustomed to the inspection to perform delicate alignment, which takes time.

  In the technique of Patent Document 2, the inspection unit is only moved so that the specified position is displayed at a preset position, and the inspection unit (optical axis of the inspection optical system) is desired by the eye of the subject. In order to accurately align with the position, it is necessary to perform a touch operation at an accurate position on the screen. In addition, after specifying the position of the display on the screen, it is necessary to wait for the movement of the inspection unit to be completed and confirm whether or not the alignment is accurate. If the desired position is not accurately aligned, the position on the screen and the confirmation after moving the inspection unit must be repeated many times in order to align the subtle distance. . Therefore, an improvement in the technique of Patent Document 2 is desired.

  An object of the present invention is to provide an ophthalmologic apparatus that can easily align a subject's eye and the apparatus in a shorter time in view of the problems of the conventional technology.

  In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) An inspection unit having an imaging means and an inspection optical system for imaging the anterior eye portion of the subject, and moving the inspection unit in the left-right direction (X direction) and the vertical direction (Y direction) with respect to the subject eye A pointing device for designating a point on the display screen, and an on-screen display screen, wherein the display device displays an anterior segment image of the moving image captured by the imaging unit. Drag detecting means for detecting a moving direction, a moving amount and a moving speed when a specified point is dragged in a predetermined area set to
Control means for controlling the driving of the XY moving means based on the moving direction, moving amount and moving speed of the drag at the designated point detected by the drag detecting means.
(2) An inspection unit having an imaging means and an inspection optical system for imaging the anterior segment of the subject, and moving the inspection unit in the left-right direction (X direction) and the vertical direction (Y direction) with respect to the subject eye A pointing device for designating a point on the screen of the display, and an anterior ocular segment image displayed on an ophthalmologic apparatus comprising: a moving unit that moves the display; and a display that displays an anterior segment image of a moving image captured by the imaging unit Point detecting means for detecting a point designated in the first area set on the display screen, and a moving direction when the designated point is dragged in the second area set on the display screen A drag detecting means for detecting a moving amount and a moving speed, and when the designated point is detected by the point detecting means, the setting is made on the screen. The driving of the XY moving means is controlled based on the position of the designated point with respect to a predetermined alignment reference position, and when the drag of the designated point is detected by the drag detecting means, the moving direction, moving amount and moving speed of the drag. Control means for controlling the driving of the XY moving means based on the above.
(3) In the ophthalmologic apparatus according to (2), the second area is set separately from an X area for moving the inspection unit in the X direction and a Y area for moving the inspection unit in the Y direction. The drag detecting means detects a moving direction, a moving amount, and a moving speed when a designated point is dragged in each of the X region and the Y region.
(4) The ophthalmologic apparatus according to (1) or (2) is for moving the inspection unit in the front-rear direction (Z direction) with respect to the subject's eye, and for moving the inspection unit in the Z direction. Z-direction drag detection means for detecting a movement amount and movement speed in a predetermined direction when a designated point is dragged in the third area set on the screen, and the control means is detected by the Z-direction drag detection means. The driving of the Z moving means is controlled based on the movement amount and movement speed of the designated point in a predetermined direction.
(5) The ophthalmologic apparatus according to (1) or (2) projects an alignment index onto the cornea of the subject's eye, receives the projected alignment index with a light receiving sensor, and aligns the subject's eye with the inspection unit. Alignment detecting means for detecting the movement and auto alignment means for controlling the driving of the moving means based on the detection result of the alignment detecting means, and the control means receives a point designation signal from the pointing device. When the point designation signal is canceled, the operation of the auto alignment means is started when the operation of the auto alignment means is stopped.

  According to the present invention, alignment between the subject's eye and the apparatus can be easily performed in a shorter time. Further, the examiner can perform the alignment operation intuitively and sensibly, and the operability can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic external view of an ophthalmic apparatus according to the present invention. A face fixing unit 2 for fixing the subject's face is fixed on the subject side of the main body 1. An inspection unit 3 in which an inspection optical system (eye refractive power measurement optical system), which will be described later, is housed in the upper part of the main body 1 is a left-right direction (X direction) and a vertical direction (Y direction) ) And the front-rear direction (Z direction). The inspection unit 3 is electrically moved in the X, Y, and Z directions by an XYZ drive mechanism 4 (moving unit) disposed in the main body 1. The XYZ drive mechanism 4 is configured by a known movement mechanism including a motor and a slide mechanism for each movement direction in the X, Y, and Z directions.

  A display unit 7 is provided on the examiner side of the main body unit 1. The display unit 7 includes a liquid crystal display 7 a that displays a subject's eye image and information to the examiner, and a touch panel 7 b (pointing device) disposed on the screen of the display 7. In the display unit 7, a signal for moving the inspection unit 3 in each of the X, Y, and Z directions can be input by touching the examiner's finger or touch pen. A signal for moving the inspection unit 3 can also be input by tilting the joystick 5 provided in the main body 1 and rotating the rotary knob 5a. The inspection unit 3 is moved in the X and Z directions by the tilt signal of the joystick 5, and is moved in the Y direction by the rotation signal of the rotary knob 5a. On the top of the joystick 5, a switch 5b for inputting a trigger signal for starting measurement is provided. The trigger signal for starting measurement can also be input by the foot switch 9.

  A switch unit 80 is disposed around the display unit 7 (see FIG. 2). The switch unit 80 includes a switch 80a for selecting whether to perform automatic alignment (automatic alignment) or manual alignment by an examiner's operation (manual alignment), and automatically when alignment with the subject's eye is completed. In addition to an auto shot mode in which a trigger signal for starting measurement is emitted and a manual shot mode in which a trigger signal for starting measurement is issued by the operator's operation of the measurement start switch 5b, a left / right eye selection switch, print A switch, a reset switch, and the like are arranged.

  FIG. 2 is a schematic configuration diagram of the inspection optical system and the control system. The eye refractive power measurement optical system 10 is reflected from the fundus oculi Ef and the projection optical system 10a that projects a spot-shaped measurement index onto the fundus oculi Ef of the subject eye E through the center of the pupil of the subject eye E. The light receiving optical system 10b is configured to extract the fundus reflection light in a ring shape through the periphery of the pupil and cause the two-dimensional imaging device to capture a ring-shaped fundus reflection image.

  The projection optical system 10 a includes a measurement light source 11, a relay lens 12, a hall mirror 13, and a measurement objective lens 14 disposed on the optical axis L <b> 1 of the measurement optical system 10. The light source 11 is optically conjugate with the fundus oculi Ef of the normal eye. The opening of the hall mirror 13 is optically conjugate with the pupil of the subject's eye E.

  In the light receiving optical system 10b, the objective lens 14 and the hall mirror 13 of the projection optical system 10a are shared, and the relay lens 16 and the total reflection mirror 17 disposed on the optical axis L1 in the reflection direction of the hall mirror 13 and the total reflection. It includes a two-dimensional imaging device 22 including a light receiving stop 18, a collimator lens 19, a ring lens 20, an area CCD, and the like disposed on the optical axis L <b> 1 in the reflection direction of the mirror 17. The light receiving aperture 18 and the image sensor 22 are in a positional relationship optically conjugate with the fundus oculi Ef. The ring lens 20 has an optically conjugate positional relationship with the pupil of the subject's eye E. An output from the image sensor 22 is input to the control unit 70 via the image memory 71.

  Between the objective lens 14 and the subject eye E, the fixation target luminous flux from the fixation target presentation optical system 30 is guided to the subject eye E, and the reflected light from the anterior eye part of the subject eye E is reflected. A dichroic mirror 29 that guides the light to the observation optical system 50 is disposed. The dichroic mirror 29 transmits the wavelength of the measurement light beam used in the measurement optical system 10. The fixation target presenting optical system 30 includes a visible light source 31, a fixation target plate 32, a light projecting lens 33, a half mirror 35, and a visible light source 31, which are arranged on an optical axis L2 coaxial with the optical axis L1 by a dichroic mirror 29. An observation objective lens 36 is included. The light source 31 and the fixation target plate 32 are moved in the direction of the optical axis L2 to fog the subject's eye E.

  An alignment index projection optical system for projecting the alignment index onto the cornea is disposed in front of the subject's eye E. The alignment index projection optical system includes a first index projection optical system 40 that projects a corneal reflection image at a finite distance on the cornea Ec, and a subject eye in order to detect an alignment state in the working distance direction with respect to the subject eye E. And a second index projection optical system 45 that projects an infinite distance index onto the cornea Ec of E. The first index projection optical system 40 is also used as anterior ocular segment illumination that illuminates the anterior segment of the subject's eye E.

  The first index projection optical system 40 includes a plurality of light sources 41. A corneal reflection image at a finite distance is projected onto the cornea Ec by divergent light (near infrared light) emitted from the light source 41. In the present embodiment, a ring index image is formed as a cornea reflection image. By detecting the center of the ring index image, the alignment state in the XY directions is detected. The measurement light source 11 can also be used as the alignment index projection optical system in the XY directions. An index image is formed at the apex of the cornea by the light beam applied to the cornea from the measurement light source 11.

  Two light sources 46 of the second index projection optical system 45 are arranged with the optical axis L1 as the center, and the respective projection optical axes are in the horizontal direction with respect to the optical axis L1 and are higher than the first index projection optical system 40. It is arranged to meet at a wide angle. The light from the light source 46 projects an infinite index (infinite index image) to the subject's eye E through the collimator lens 47.

  Since the index projected by the second index projection optical system 45 is parallel light, even if the working distance (distance in the Z direction) of the inspection unit 3 with respect to the subject's eye E changes, the position of the infinity index image is almost the same. It does not change. On the other hand, since the index projected by the first index projection optical system 40 is divergent light, the position of the ring index image changes when the working distance changes. An alignment state in the Z direction is detected based on the positions of these cornea reflection images (infinity index image and ring index image) (for details, refer to JP-A-6-46999). Further, the alignment state in the XY directions is detected based on the position of the cornea reflection image (alignment index image) by the measurement light source 11 projected from the front direction of the subject's eye. Thereby, it becomes possible to perform the automatic alignment with respect to the subject eye E or the manual alignment based on the anterior segment image displayed on the display unit 7.

  The observation optical system 50 includes an imaging lens 51 and a two-dimensional imaging element 52 that are shared by the objective lens 36 and the half mirror 35 of the fixation target presentation optical system 30 and are arranged on the optical axis in the reflection direction of the half mirror 35. . An image of the anterior segment of the subject's eye E is captured by the imaging element 52. An output from the image sensor 52 is input to the control unit 70. An anterior segment image of the subject eye E is displayed on the display unit 7. Note that the observation optical system 50 also serves as an optical system that detects an alignment index projected onto the cornea of the subject's eye E, and the imaging device 52 also serves as a light receiving sensor that receives the alignment index projected onto the cornea. . Then, the position of the alignment index image captured by the image sensor 52 is detected by the control unit 70. The control unit 70 also has a role of generating display marks such as an aiming mark 101, a reticle mark, an indicator, and other condition settings described later.

  The control unit 70 includes an image sensor 52, a memory 75, a display unit 7 (display 7a and touch panel 7b), an XYZ drive mechanism 4, a joystick 5 (rotary knob 5a, measurement start switch 5b), and a plurality of switches. A switch unit 80 and an image memory 71 used for setting are connected. The control unit 70 controls driving of the XYZ drive mechanism 4, the image sensor 52, and the display 7a based on input signals from the touch panel 7b, the joystick 5, and the switch unit 80.

  Next, the operation of the apparatus having the above configuration will be described. When the apparatus is activated, a measurement screen 100 is displayed on the display unit 7. 3 and 4 are examples of the measurement screen 100 displayed on the display unit 7. In the center of the measurement screen 100, a ring-shaped aiming mark 101 for guiding the alignment of the eye E is displayed. An anterior ocular segment image EM of the eye to be examined captured by the image sensor 52 of the observation optical system 50 is displayed on the measurement screen 100. FIG. 3 shows a state before the alignment of the subject eye E is completed, and the anterior eye image EM is displayed in the upper left direction of the measurement screen 100. FIG. 4 is a diagram of the alignment completed state, and a ring index image (Meyer ring image) R projected onto the cornea by the first index projection optical system 40 and 2 projected onto the cornea by the second index projection optical system 45. Two index images M are displayed on the screen 100. Further, when the light source 11 is turned on, the index image O formed at the apex of the cornea is displayed on the screen 100. These index images R, M, and O appear on the screen when the corneal reflection light of the alignment light enters the observation optical system 50 and is imaged by the image sensor 52. As shown in FIG. 3, when the alignment in the XY direction of the inspection unit 3 with respect to the eye to be examined is greatly shifted, the index images R, M, and O have not appeared on the screen 100.

  When the examination unit 3 is moved with respect to the eye to be examined, in the present apparatus, a signal for moving the examination unit 3 can be input using the touch function of the display unit 7. Hereinafter, control in which the inspection unit 3 is moved when the examiner designates a point on the touch panel 7b and drags the designated point will be described with reference to the flowchart of FIG.

  Two-dimensional coordinate axes (x-axis and y-axis) are set in advance on the touch panel 7b by a program. Since different voltages are transmitted from different coordinates (x, y), the position (designated point) designated on the touch panel 7b is recognized by the control unit 70.

  For example, in the x-axis component, a voltage of 0V is set at the coordinates of the left end Xa of the screen, and a voltage of 5V is set at the coordinates of the right end Xb. As the coordinates of the designated point approach from the Xa side to the Xb side, the voltage signal transmitted from the touch panel 7b increases from 0V to 5V in a predetermined step. Similarly, for the y-axis component, a voltage of 0V is set for the coordinates of the upper end Ya of the screen, and a voltage of 5V is set for the coordinates of the lower end Yb. Increase in predetermined steps. Note that the voltage signal values set for the coordinates of the x-axis and the y-axis are stored in the memory 75 in advance.

  The memory 75 stores in advance a distance for moving the inspection unit 3 per unit coordinate. The control unit 70 obtains the distance to move the inspection unit 3 from the difference between the x-axis component and the y-axis component per unit time when the designated point is dragged, and calculates the drive amount of the XYZ drive mechanism 4.

  When the apparatus is activated, the control unit 70 reads a signal transmitted from the touch panel 7b constantly or at predetermined time intervals (step 201), and analyzes whether there is a signal from the touch panel 7b (step 202). Since the signal from the touch panel 7b is not detected when the touch panel 7b is not pressed, the process returns to step 201, and the control unit 70 repeatedly receives the voltage signal.

  When the touch panel 7b is pressed, the control unit 70 recognizes the coordinates (position) of the designated point based on the signal transmitted from the touch panel 7b. In the example of FIG. 3, the position of the point P1 designated by the touch pen S is recognized. (Step 203). While the state where the touch panel 7b is being pressed continues, a signal from the touch panel 7b is continuously transmitted. The control unit 70 compares the coordinates detected based on the signal received every unit time, and determines whether the designated point P has moved on the touch panel 7b (step 204).

  For example, if the signal detected at a certain time t0 is the same as the signal detected at the next time t1, the control unit 70 determines that the designated point has not been moved. On the other hand, when the signals detected at time t0 and time t1 are different, the control unit 70 determines that the designated point has been moved (step 204). Then, the moving direction and moving amount in which the designated point is dragged are calculated from the change in coordinates detected at time t0 and time t1 (step 205).

  For example, it is assumed that the touch pen S is moved from the point P1 to the point P2 in the arrow A direction. At this time, the control unit 70 detects the coordinates (x0, y0) of the point P1 at the first detection time t0, and detects the coordinates (x1, y1) on the arrow A at the next detection time t1. At this time, since the designated point is moved (dragged) by the touch pen S, the control unit 70 determines the movement distance (x1−x0) in the x-axis direction and the y-axis direction from the coordinates detected at the time t1 and the time t0. The movement distance (y1-y0) is calculated. The moving direction is obtained from changes in coordinates (x0, y0) and coordinates (x1, y1).

  As described above, when the control unit 70 obtains the movement amount and movement direction when the designated point is dragged in step 205, a signal for moving the inspection unit 3 according to the obtained movement amount and movement direction is given. (Step 206).

  When step 206 is completed, the process returns to step 201. Then, the movement amount and the movement direction are repeatedly calculated from the change in the coordinates of the designated point detected every subsequent detection time (t2, t3,...). Since the coordinates of the designated point are detected every unit time and the movement amount is calculated based on the detection, the speed at which the inspection unit 3 is moved is changed according to the speed at which the designated point is dragged.

  When the pressing of the designated point on the touch panel 7b is released and no signal is received from the touch panel 7b, the control unit 70 recognizes that the touch pen S is released from the designated point (step 202). Then, the last detected coordinates among the signals transmitted from the touch panel 7b are stored in the memory 75 as final positions (step 210). Here, the coordinates of the designated point P2 (for example, the coordinates (x100, y100) detected at time t100) are stored in the memory 75.

  Next, the control unit 70 calculates the movement direction and the movement amount from the last stored coordinates and the coordinates detected from the previous signal (step 211). At this time, the control unit 70 checks the remaining drive amount of the XYZ drive mechanism 4 (step 212). When the remaining amount of drive amount of the XYZ drive mechanism 4 remains, a new drive signal obtained by adding the movement amount calculated in step 211 to the remaining amount is transmitted to the XYZ drive mechanism 4 (steps 213 and 214). .

  The control unit 70 monitors whether the driving amount of the XYZ driving mechanism 4 has a remaining amount. If there is a remaining amount, the driving of the XYZ driving mechanism 4 is continued (steps 215 and 216). When the remaining amount of drive amount of the XYZ drive mechanism 4 becomes 0, the drive of the XYZ drive mechanism 4 is stopped (step 217). By the signal processing in steps 210 to 217, the control unit 70 can move the inspection unit 3 to the position where the designated point is finally dragged even when the drag speed on the touch panel 7 b is too fast. it can.

  As described above, the movement amount and movement direction of the inspection unit 3 are controlled in conjunction with the dragging of the designated point on the touch panel 7b, and finally the inspection unit 3 is designated on the touch panel 7b by the designated point P2. Moved to match (final position). Since the inspection unit 3 is moved in conjunction with the movement of the anterior segment image displayed on the display unit 7 by dragging, the examiner can perform alignment by an intuitive operation.

  Next, an actual alignment operation will be described. First, an auto alignment mode in which the inspection unit 3 is automatically moved based on detection of alignment index images (M, R, and O) will be described.

  When the auto alignment mode is selected by the switch 80a, an icon 106 indicating that the auto alignment mode is set is displayed on the measurement screen 100. As shown in FIG. 3, when the alignment state of the eye to be inspected and the inspection unit 3 in the XY direction is greatly deviated, the index images R and M are not detected by the image sensor 52. In this case, the examiner drags the designated point on the screen of the display unit 7 as described above until the automatic alignment by the detection of the alignment index image (R, M, and O) is started. Unit 3 can be moved. That is, after specifying an arbitrary point P1 on the screen with the touch pen S or the finger, the point P1 is dragged in the direction of the point P2 in FIG. 4 so that the center of the anterior segment image EM is positioned at the center of the aiming mark 101. . By this drag operation, the inspection unit 3 is moved in the XY directions, and the anterior eye image EM displayed on the screen of the display unit 7 is displayed so as to face the aiming mark 101.

  When the index image formed by the first index projection optical system 40 and the second index projection optical system 45 is picked up by the imaging element 52, the ring image index R, the index image M, and the index image O are displayed on the display unit 7. It will be displayed on top and auto alignment will be possible. At this time, it is convenient if a message 108 is displayed on the display unit 7 to inform the examiner that auto-alignment is possible. By displaying the message 108, the examiner can easily confirm that the auto alignment is possible.

  When the signal from the touch panel 7b is input, the control unit 70 stops the auto alignment operation based on the alignment index, and controls the driving of the XYZ drive mechanism 4 based on the signal from the touch panel 7b. When the designated point P2 on the touch panel 7b is released (the finger or the touch pen S is released) in a state where auto alignment is possible, the control unit 70 starts an auto alignment operation based on the alignment index. The control unit 70 detects the center position of the ring image index R imaged by the image sensor 52 by image processing, and obtains a deviation in the XY direction between the detected center position and the optical axis L1 of the inspection optical system. Alternatively, the index image O formed at the apex of the cornea is detected, and the deviation in the XY direction between the center of the index image O and the optical axis L1 of the inspection optical system is obtained. Then, the driving of the XYZ drive mechanism 4 is controlled based on the obtained deviation, and the inspection unit 3 is automatically moved in the XY direction. Further, the deviation in the Z-axis direction is obtained based on the ring index image R and the index image M, the drive of the XYZ drive mechanism 4 is controlled based on the obtained deviation, and the inspection unit 3 is moved in the Z direction. Thereby, alignment is automatically completed.

  When the alignment in the Z direction is greatly deviated, a movement signal for moving the inspection unit 3 in the Z direction can also be input by a touch operation on the display 7 unit. For example, an area 110 for inputting a movement signal in the Z direction is provided on the right side of the screen 100. After the examiner designates an arbitrary point with the touch pen S or the finger on the area 110 and drags the designated point upward on the screen, the examination unit 3 advances in the eye direction of the subject. Is done. Conversely, the inspection unit 3 is retracted by dragging the designated point in the downward direction of the screen as indicated by the arrow ZB on the right area 110. Prior to the automatic alignment, the anterior segment image EM or the ring image index R or the like displayed on the screen is adjusted to some extent so that the automatic alignment in the Z direction is possible.

  When the alignment between the subject's eye and the inspection unit 3 (inspection optical system) is completed, a trigger signal for starting measurement is automatically issued (or an alignment completion message is displayed on the screen 100, and the examiner Measurement is started by pressing the switch 5b or the like).

  In the measurement of objective eye refractive power, preliminary measurement of eye refractive power is first performed, and the light source 31 and the fixation target plate 32 are moved in the direction of the optical axis L2 based on the result of the preliminary measurement. Clouds are applied to the eye E. Thereafter, the main measurement of the eye refractive power is performed on the eye to be inspected with fog. In this measurement, a ring image by the ring lens 20 is picked up by the image pickup device 22, and an output signal from the image pickup device 22 is stored in the image memory 71 as image data (measurement image). Thereafter, the control unit 70 performs image analysis on the ring image stored in the image memory 71 to obtain a value of refractive power in each meridian direction. The control unit 70 performs a predetermined process on the refractive power to obtain refractive power values of S (spherical power), C (astigmatic power), and A (astigmatic axis angle) of the subject's eye. The obtained refractive power at the time of distance use is stored in the memory 75 and displayed on the screen of the display unit 7.

  Next, the operation in the manual mode in which the examiner performs alignment manually will be described. Usually, the eye refractive power is measured without any problem by using auto-alignment based on the detection of the alignment index. However, when the subject's eye has a keratoconus, the ring index image R, the index image O, etc. are formed at positions shifted from the corneal apex. In this case, the automatic alignment tends to cause an error in measurement, and the measurement result tends to be inaccurate. Further, in the case of the subject's eye whose pupil center is greatly deviated from the apex of the cornea, part of the measurement light beam that passes through the pupil is blocked by the glow. Also in this case, the measurement is likely to cause an error in auto alignment, and the measurement result is likely to be inaccurate.

  For example, FIGS. 6A and 6B show a case where the corneal apex and the pupil Pu are greatly displaced. At such time, the examiner selects the manual alignment mode in which the alignment is manually performed by the switch 80b. The examiner touches an arbitrary point P1 on the screen with the touch pen S or the finger, and the center of the pupil Pu of the anterior segment image EM is directed to the center of the aiming mark 101 as in the case of FIGS. Drag the designated point P1. When the designated point is dragged, the coordinates of the designated point and the dragged coordinates are detected by the control unit 70 based on a signal output from the touch panel 7b, and a command signal for moving the inspection unit 3 is transmitted to the drive mechanism 4. The As a result, the inspection unit 3 is moved substantially in real time in conjunction with the dragging of the designated point P1. That is, since the control unit 70 issues a command signal for moving the inspection unit 3 according to the change in the coordinates of the designated point every unit time, the inspection is performed according to the dragging of the designated point P1 in the XY direction and the moving speed thereof. Unit 3 is moved. When the center of the pupil Pu (anterior eye image EM) is greatly deviated from the aiming mark 101, when the designated point P1 is dragged at a high speed, the inspection unit 3 is also moved at a high speed. When the examiner slows down the drag speed to approach the center of the pupil Pu near the aiming mark 101 and perform fine positioning, the examination unit 3 is also moved at a slow speed.

  The examiner observes the anterior ocular segment image EM displayed on the screen of the display unit 7 and can easily and delicately align the center of the pupil Pu and the center of the aiming mark 101. In other words, the examiner observes the anterior eye image EM on the screen, and when a small amount of movement is necessary, if the specified point on the screen is dragged by the necessary amount of movement, the examiner is dragged by the drag. The anterior segment image EM on the screen is also moved (the moving unit 3 is moved). The XY direction in which the anterior eye image EM on the screen is moved is also matched with the XY direction in which the examiner drags the designated point on the screen, so that the operability is intuitive and easy to understand. As shown in FIG. 6B, the examiner performs fine alignment between the center of the pupil Pu and the aiming mark 101 by dragging the designated point (desired anterior eye portion and predetermined position of the apparatus). Can be easily aligned in a shorter time.

  As for the alignment in the Z direction, the inspection unit 3 is moved forward and backward as the examiner drags a designated point in the vertical direction on the area 110 in the same manner as described above. Also in this case, the moving speed of the moving unit 3 is changed according to the dragging speed of the designated point on the area 110, and the moving unit 3 is moved by the dragging distance of the designated point. For this reason, rough alignment when moving the inspection unit 3 greatly can be performed quickly, and delicate alignment for slightly moving the inspection unit 3 can be performed precisely. Then, when alignment is achieved in a state desired by the subject, measurement is executed by inputting a trigger signal by the foot switch 9 or the like.

  In the description of FIG. 6, when the examiner manually performs alignment, the manual mode is switched. However, even in the auto alignment mode, the subject can perform alignment to a desired site. That is, the control unit 70 stops the auto-alignment operation (priority is given to the signal from the touch panel 7b) when a command signal for moving the inspection unit 3 is input from the touch panel 7b by point designation and dragging. Therefore, as shown in FIG. 6B, if the center of the pupil Pu is aligned and the touched state on the touch panel 7b is maintained, the auto alignment based on the detection of the index image (R, M and O) is performed. In this state, the trigger signal is input by the foot switch 9 or the like, and the measurement is executed. Even in such an apparatus having an auto-alignment function, measurement can be easily performed in a state where it is aligned with a desired site by combining manual operations.

  In the above description, the touch panel 7b is used to specify a point on the screen of the display unit 7 and input a drag signal. However, other pointing devices can be used to input these signals. For example, a mouse 8 (see FIG. 1) used in a computer system can be applied as a pointing device. A signal for moving the inspection unit 3 can be input by moving a predetermined pointer displayed on the screen of the display unit 7 by operating the mouse, specifying a point by left clicking, and dragging. Further, instead of the mouse, the joystick 5 and the switch 5b can be used as a pointing device.

  The manual alignment operation described above is an example in which the inspection unit 3 is moved only by dragging a specified point. However, when the technique described in Japanese Patent Application Laid-Open No. 2005-323712 and the drag operation are combined, rough alignment and Subtle alignment can be performed more easily. Examples thereof will be described below.

  In the measurement screen 200 of the touch panel in FIG. 7, an area 201 provided at the bottom of the screen is set as an area (X area) for inputting a signal for moving the inspection unit 3 in the horizontal direction (X direction) by a drag operation. . The areas 202a and 202b provided on the left and right sides of the screen are set as areas (Y areas) for inputting a signal for moving the inspection unit 3 in the vertical direction (Y direction) by a drag operation. In a region 203 other than the regions 201, 202a and 202b, when a point on the region 203 is designated, the movement direction (XY direction) and movement of the inspection unit 3 according to the direction and distance of the designated point with respect to the center of the aiming mark 101 The distance is set in an area calculated by the control unit 70. In the example of FIG. 7, the area 201, the area 202 a, and the area 202 b are displayed with a pattern that makes an image of a rotary dial.

  The examiner observes the anterior ocular segment image EM displayed on the measurement screen 200 of the touch panel 7b, and touches the point Pa1 which is a part to be positioned at the center of the aiming mark 101 with a finger or the like. When the point Pa1 is designated by this touch operation, the position coordinate of the point Pa1 is detected from the signal from the touch panel 7b, and the distance and direction of the position coordinate of the point Pa1 with respect to the center coordinate CO of the aiming mark 101 are calculated. That is, the distances in the x direction and the y direction of the point Pa1 with respect to the center coordinate CO are respectively obtained. The distance by which the inspection unit 3 is moved in the XY direction with respect to the unit distance in the x direction and the y direction on the touch panel 7b is set in advance in relation to the observation magnification of the anterior segment image obtained by the image sensor 52. Yes. The control unit 70 moves the inspection unit 3 in the XY directions according to the distances in the x direction and the y direction of the point Pa1 with respect to the center coordinate CO. Thereby, the part of the anterior ocular segment image EM designated by the point Pa1 is roughly aligned with the center coordinate CO of the aiming mark 101. Thereby, rough alignment can be easily and quickly performed as compared with the drag operation.

  However, the point Pa1 specified in the observation of the anterior ocular segment image has an error because a desired position cannot be accurately specified by finger touch. Moreover, although the distance for moving the inspection unit 3 is set according to the observation magnification, when the Z direction is not a predetermined distance, there is an error in the observation magnification. For this reason, even if the desired position is correctly specified, it is difficult to accurately align the site specified by the point Pa1 with the center of the aiming mark 101.

  Therefore, when the rough alignment is completed, the examiner uses a drag operation in the areas 201, 202a, and 202b for strict alignment adjustment. FIG. 7B shows an anterior segment image EM when rough alignment is completed. When the examiner drags the rotation dial symbol of the region 201 to rotate rightward by a finger touch operation, a signal for moving the inspection unit 3 to the right following the dragging is input, and rotation of the region 201 is performed. When the dial symbol is dragged to rotate leftward, a signal for moving the inspection unit 3 to the left following the dragging is input. Further, the movement amount of the inspection unit 3 is obtained from the movement amount (drag amount) of the designated point touched with the finger. Then, the moving speed of the inspection unit 3 is determined according to the moving speed (drag speed) of the designated point touched with the finger. That is, when the examiner moves the designated point quickly so as to turn the rotary dial symbol in the area 201 quickly, the examination unit 3 is also moved quickly in the moving direction of the designated point. Similarly, the up / down movement direction, the movement amount, and the movement speed of the inspection unit 3 are determined by the drag operation of the rotary dial symbols in the areas 202a and 202b.

  When the examiner observes the anterior segment image EM shown in FIG. 7B and wants to align the center of the pupil Pu with the aiming mark 101, the examiner moves the examination unit by dragging in the horizontal direction in the region 201. The inspection unit 3 is moved up and down by a drag operation in the up and down direction in the region 202a or 202b. For example, each region is set so that the examiner can touch the thumb on the region 202a and touch the index finger on the region 202a, so that the examiner can simultaneously input movement signals in the XY directions with one hand. In addition, since the movement of the inspection unit 3 can be finely adjusted by performing the drag operation of each area as if turning the rotary dial, easy and accurate alignment can be performed. Further, since the drag direction and the moving direction of the inspection unit 3 correspond to each other, the examiner can perform an alignment operation intuitively and intuitively.

  FIG. 8 is a modified example of FIG. An area 211 provided below the measurement screen 200 is an area where the inspection unit 3 is moved in the X direction and the Y direction by a drag operation. In the area 211 of this example, a two-dimensional drag operation signal in the XY directions is input to the example of FIG. For this reason, movement signals in the XY directions can be simultaneously input with a finger or the like. An area 213 above the area 211 displays the anterior segment image EM, and when a point on the area 213 is designated as in the area 203 in FIG. 7, the direction of the designated point with respect to the center of the aiming mark 101 The control unit 70 calculates the XY direction and the movement distance of the inspection unit 3 according to the distance. The area 101 is set as a drag area used for alignment in the Z direction, as in FIG.

  Also in the example of FIG. 8, the region 213 is used for coarse alignment, and the drag operation in the region 211 is used for fine adjustment, so that a rough alignment step can be performed quickly, and precise alignment is easy and accurate. Can be done.

1 is a schematic external view of an ophthalmologic apparatus. It is a schematic block diagram of an inspection optical system and a control system. It is an example of a measurement screen. It is an example of a measurement screen. It is a flowchart explaining the control which moves a test | inspection unit by dragging the point designated with the touch panel. It is a figure explaining manual mode in case a corneal vertex and a pupil have shifted | deviated large. It is an example of a measurement screen of a modification example. It is an example of a measurement screen of a modification example.

3 Inspection Unit 4 XYZ Drive Mechanism 7 Display Unit 7
7b Touch panel 70 Control unit

Claims (5)

An inspection unit having an imaging means and an inspection optical system for imaging the anterior segment of the subject, and XY movement for moving the inspection unit in the left-right direction (X direction) and the up-down direction (Y direction) with respect to the subject eye An ophthalmologic apparatus comprising: a display unit configured to display an anterior ocular segment image of a moving image captured by the imaging unit;
A pointing device for designating points on the display screen;
Drag detecting means for detecting a moving direction, a moving amount and a moving speed when a designated point is dragged in a predetermined area set on the screen of the display;
Control means for controlling the driving of the XY moving means based on the moving direction, moving amount and moving speed of the drag at the designated point detected by the drag detecting means;
An ophthalmologic apparatus comprising: An imaging unit for imaging the anterior eye portion of the subject and an inspection unit having an inspection optical system, and a moving means for moving the inspection unit in the left-right direction (X direction) and the vertical direction (Y direction) with respect to the subject eye An ophthalmologic apparatus comprising: a display that displays an anterior segment image of a moving image captured by the imaging unit;
A pointing device for designating points on the display screen;
Point detecting means for detecting a point designated in the first area set on the screen of the display on which the anterior segment image is displayed;
Drag detecting means for detecting a moving direction, a moving amount, and a moving speed when a designated point is dragged in the second area set on the screen of the display;
When the designated point is detected by the point detecting means, the drive of the XY moving means is controlled based on the position of the designated point with respect to a predetermined alignment reference position set on the screen, and the drag detecting means An ophthalmologic apparatus comprising: a control unit that controls driving of the XY moving unit based on a moving direction, a moving amount, and a moving speed of a drag when a specified point drag is detected. 3. The ophthalmologic apparatus according to claim 2, wherein the second area is set separately from an X area for moving the inspection unit in the X direction and a Y area for moving the inspection unit in the Y direction, and the drag detection. The means detects an moving direction, a moving amount, and a moving speed when a designated point is dragged in each of the X region and the Y region. The ophthalmologic apparatus according to claim 1 or 2 is set on a screen for moving the examination unit in the front-rear direction (Z direction) relative to the subject's eye, and for moving the examination unit in the Z direction. And a Z-direction drag detecting means for detecting a movement amount and a moving speed in a predetermined direction when the designated point is dragged in the third area, and the control means drags the designated point detected by the Z-direction drag detecting means. An ophthalmologic apparatus that controls driving of the Z moving means based on a moving amount and moving speed in a predetermined direction. The ophthalmologic apparatus according to claim 1 or 2, wherein the alignment index is projected onto the cornea of the subject's eye, and the alignment index between the subject's eye and the inspection unit is detected by receiving the projected alignment index on the light receiving sensor. Means, and auto alignment means for controlling the driving of the moving means based on the detection result of the alignment detection means,
The control means stops the operation of the auto alignment means when a point designation signal is input from the pointing device, and starts the operation of the auto alignment means when the point designation signal is canceled. A featured ophthalmic device.

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