JP2007125260A - Ophthalmologic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow an examiner to easily confirm a measurement result and also to surely notify the examiner of achievement of a prescribed measurement completion condition. <P>SOLUTION: An ophthalmologic apparatus comprises: a measurement unit having a measurement means for measuring an eye to be examined; an imaging means for imaging the eye to be examined so as to obtain the image of the eye to be examined; a display means for combining the image of the eye to be examined obtained by the imaging means and the measurement result obtained by the measurement unit into one, and displaying it; a determining means for determining whether or not the measurement result obtained by the measurement unit satisfies the prescribed measurement completion condition; and a display control means for controlling so as to display the measurement result with emphasis by filling the background of an area for displaying the measurement result with the use of prescribed color when the determining means determines that the prescribed measurement completion condition is satisfied. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ophthalmologic apparatus for measuring an eye to be examined.

As an ophthalmologic apparatus for measuring an eye to be examined, an eye refractive power measuring apparatus, a non-contact tonometer, and the like are known. In the case of this type of device, it is common to have a display monitor, and the display monitor mainly includes an eye observation image for alignment adjustment to the eye to be examined by the examiner and a measurement obtained by a predetermined measuring means. It is used to display the result (see Patent Document 1).
Japanese Patent Laid-Open No. 10-216088

By the way, in the conventional display method of the measurement result, the eye image to be examined is displayed also in the background of the area where the measurement result is displayed as shown in FIG. 8, for example, so that the examiner can easily adjust the alignment. .
In addition, one example of Patent Document 1 discloses a device that displays characters “FINISH” together with a measurement result on a display monitor when a predetermined measurement end condition is reached.

  In view of the above prior art, the present invention provides an ophthalmologic apparatus that facilitates confirmation of measurement results by an examiner and can reliably notify the examiner that a predetermined measurement end condition has been reached. Let it be an issue.

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

(1) Obtained by a measuring unit having a measuring means for measuring the eye to be examined, an imaging means for photographing the eye to be examined to obtain an eye image, an eye image obtained by the photographing means and the measuring unit An ophthalmologic apparatus comprising: a display unit configured to synthesize and display measurement results; a determination unit that determines whether or not a measurement result obtained by the measurement unit satisfies a predetermined measurement end condition; Display control means for performing control to highlight the measurement result by painting a background in a region in which the measurement result is displayed with a predetermined color when it is determined that the measurement end condition is satisfied It is characterized by that.
(2) In the ophthalmologic apparatus according to (1), the ophthalmologic apparatus includes a determination unit that determines the reliability of the measurement result obtained by the measurement unit, and the display control unit is configured to perform the determination based on the determination result obtained by the determination unit. It is characterized in that the display state of the fill is changed.
(3) In the ophthalmologic apparatus according to (2), the display control unit changes the color of the fill based on a determination result of the determination unit.

  According to the present invention, it is possible to easily confirm the measurement result by the examiner and reliably notify the examiner that the predetermined measurement end condition has been reached.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external configuration diagram of an ophthalmologic apparatus according to the first embodiment. The ophthalmologic apparatus 100 is a so-called stationary ophthalmologic apparatus, and includes a base 1, a face support unit 2 attached to the base 1, a movable base 3 that is movably provided on the base 1, and a movement A measuring unit (measuring unit) 4 is provided which is movably provided on the table 3 and houses an optical system which will be described later. The measuring unit 4 is moved in the left and right direction (X direction), the up and down direction (Y direction), and the front and rear direction (Z direction) with respect to the eye E by an XYZ driving unit 6 provided on the moving table 3. The movable table 3 is moved in the X direction and the Z direction on the base 1 by operating the joystick 5. Further, when the examiner rotates the rotary knob 5 a, the measurement unit 4 is moved in the Y direction by the Y drive of the XYZ drive unit 6. On the top of the joystick 5, a measurement start switch 5b is provided. A display monitor 40 is provided on the movable table 3.

  FIG. 2 is a schematic configuration diagram for explaining the configuration of the optical system and the control system of the ophthalmologic apparatus according to the present embodiment. On the transmission optical path O1 of the dichroic mirror 1 in front of the eye E, an eye refractive power measurement optical system 10 that is one of measuring means for measuring the eye to be examined is arranged. The measurement optical system 10 is an optical system that projects a measurement light beam onto the fundus and causes the light receiving element to receive a reflected light beam from the fundus of the subject's eye, and measures eye refractive power based on the output of the light receiving element. Since the measurement optical system 10 and its measurement principle can be known, the description thereof is omitted here.

  In the reflection direction of the dichroic mirror 1, an objective lens 11, a dichroic mirror 12, and a total reflection mirror 13 for observing the eye E are arranged. On the optical path O2 in the reflection direction of the mirror 13, a fixation target projection optical system (not shown) for fixing the fixation target to the eye E is arranged.

  On the optical path O3 in the reflection direction of the dichroic mirror 12, the eye E is photographed including the imaging lens 20, and a two-dimensional imaging device 21 such as an area CCD disposed at a position substantially conjugate with the vicinity of the anterior segment of the eye E. An observation optical system 22 for obtaining an eye image to be examined is arranged.

  Furthermore, in front of the anterior segment of the eye E, a ring index projection optical system 30 that emits near-infrared light for projecting the ring index onto the cornea Ec of the eye E, and an infinity index on the cornea Ec of the eye E A working distance index projection optical system 31 that emits near-infrared light for detecting the alignment state in the working distance direction with respect to the eye to be examined by projecting is disposed symmetrically with respect to the observation optical axis. The ring projection optical system 30 is also used as anterior segment illumination for illuminating the anterior segment of the eye E.

  Here, the dichroic mirror 1 transmits light having a wavelength emitted from a measurement light source included in the measurement optical system 10, and reflects light having a wavelength and visible light emitted from the ring projection optical system 30 and the working distance projection optical system 31. Has characteristics. The dichroic mirror 12 has a characteristic of transmitting visible light and reflecting infrared light.

  The control unit 70 performs an operation for obtaining the eye refractive power based on the output signal from the light receiving element of the measurement optical system 10. In addition, an image signal from the image sensor 21 is input to the control unit 70. The anterior ocular segment image obtained by the image sensor 21 is displayed on the screen of the display monitor 40 after being combined (superimposed) with display information such as measurement results and alignment marks by the control unit 70. In addition, the control unit 70 includes a memory 71 for storing data such as measurement results, a joystick 5, a measurement start switch 5b provided on the top of the joystick 5, and a drive mechanism for moving the measurement unit 4 in a three-dimensional direction. 6. An operation switch unit 45 that is arranged in a casing portion near the periphery of the display monitor 40 and performs various settings relating to inspection (switching of measurement mode, switching of alignment mode, etc.), and a signal for clearing the obtained measurement result Are connected to the control unit 70, a clear switch 46, a print switch 47 for inputting a signal for printing out the measurement result to the control unit 70, a printer 63, and the like.

  The operation of the apparatus having the above configuration will be described. Here, the case where the continuous measurement mode of the eye refractive power is selected will be described (see the flowchart of FIG. 3).

  The examiner fixes the subject's face to the face support unit 2 and instructs to fixate a fixation target (not shown), and then performs alignment with the eye to be examined. As a result, the anterior segment of the eye to be examined is photographed by the imaging device 21, and the anterior segment image F, the reticle mark 101, and the ring index image (Meyer ring image) projected by the ring projection optical system 30 on the display monitor 40. ) R, an infinite index image M projected by the working distance projection optical system 31 is displayed (see FIG. 4A). Note that the letter R displayed at the upper left corner of the display monitor 40 and the letter L displayed at the upper right corner indicate whether the eye being measured is the left or right eye. In addition, the control unit 70 displays, in order from the top, the number of measurements, the spherical power S, the column surface power C, and the astigmatic axis angle A in the area REF in which the measurement results are displayed. Each eye) is displayed, and in the stage before measurement, the measured value shows a zero state (the measured value is preferably displayed in white). When the measurement result is displayed on the anterior eye part F of the eye to be examined, the reticle mark 101, the ring index image R, the indicator, and the like used for alignment are set so as not to be hidden. In addition, it is preferable that when the alignment of the eye to be examined is completed, the most part of the boundary between the pupil and iris of the eye to be examined (for example, within a diameter of 8 mm from the alignment reference position) is not hidden.

  In addition, the measurement result and other character / symbol information such as the reticle mark 101 are displayed on the screen with the anterior eye image F taken as a background so that the examiner can easily adjust the alignment to the eye E. It has come to be. At this time, the control unit 70 synthesizes and displays display information such as measurement results on the anterior segment image F, the ring index image R, and the like.

  When the rough alignment is completed, the control unit 70 detects the alignment state with respect to the eye to be examined based on the imaging signal from the imaging device 21. In this case, the control unit 70 obtains an alignment state in the vertical and horizontal directions with respect to the eye to be examined based on the center coordinates of the ring index R. Further, when the measuring unit 4 is displaced in the working distance direction, the control unit 70 says that the image interval in the predetermined meridian direction of the ring index changes while the interval of the infinity index M hardly changes. Using the characteristic, the alignment state in the working distance direction with respect to the eye to be examined is obtained (for details, refer to Japanese Patent Laid-Open No. 6-46999). And the control part 70 moves the measurement part 4 by drive-controlling the drive mechanism 6 based on the alignment detection result, and performs the automatic alignment with respect to a to-be-tested eye. When the alignment is completed, the control unit 70 automatically issues a trigger signal and starts measurement (auto shot).

  Note that when the automatic alignment mode and the auto-shot mode are selected as described above, the examiner instructs the fixation target (not shown) to fixate, and then displays the ring image (displayed on the display monitor 40). The joystick 5 is operated while looking at the Meyer ring image) R, and the position of the measurement unit 4 is adjusted in the vertical and horizontal directions so that the ring image R and the reticle mark 101 are concentric. Thereafter, the position of the measuring unit 4 in the working distance direction is adjusted with reference to the indicator (or so that the ring image R becomes the thinnest). Then, when the alignment is completed and the measurement start switch 5b is pushed by the examiner, the measurement is performed. When the measurement start switch 5b is pressed and held, a measurement start trigger signal is continuously transmitted.

  The control unit 70 turns on the measurement light source of the measurement optical system 10 based on the input of the trigger signal. A measurement light beam emitted from the measurement light source is projected onto the fundus oculi Ef via a projection optical system (not shown). The measurement light beam reflected by the fundus oculi Ef is received by the light receiving element via a light receiving optical system (not shown).

  First, eye refractive power is preliminarily measured, and a light source and a fixation target plate (not shown) are moved in the direction of the optical path O2 based on the result of the preliminary measurement. Clouds are applied. Thereafter, the eye refractive power is measured for the eye to be inspected with cloud fog.

  The measurement of the eye refractive power is continuously performed, and the control unit 70 updates the number of times of measurement and the display result of the measurement result every time the measurement of the eye refractive power is completed (see FIG. 4B). . When a predetermined number (for example, three) of measurement values excluding the measurement error is obtained, the control unit 70 determines that the measurement result satisfies a predetermined measurement end condition, and ends the measurement. Then, the control unit 70 displays the characters “FINISH” on the display monitor 40, which means the end of the measurement of one eye, and fills the background in the area REF where the measurement result is displayed with a predetermined color (hatching N). ), The measurement result displayed in the region REF is highlighted (see FIG. 4C). For example, the background in the region REF is painted in blue and the measurement result is displayed in white.

  This makes it easier for the examiner to confirm the measurement result because the measured value is emphasized by the above-described painting effect and is easy to see. Further, from the display monitor 40, it is possible to reliably notify the examiner from the display monitor 40 that the measurement result satisfies the predetermined measurement end condition. It should be noted that a part of the anterior segment image of the eye to be examined cannot be observed by adding a fill that makes the background invisible, but it is only added to the background of the area REF that displays the measurement result. It is possible to observe the anterior ocular segment image from other regions. In this case, when the alignment of the eye to be examined is completed, if the majority of the boundary between the pupil and iris of the eye to be examined can be observed, the alignment state with respect to the eye E can be easily observed. However, quick response is possible. When measuring a plurality of functions of the eye E (corneal shape and eye refractive power, etc.), when both measurements are completed, the background of the area for displaying the measurement result of the cornea shape and the eye refractive power is filled. Can be considered.

  When performing the display control as described above, the reliability of the obtained measurement result may be determined, and the display state of the fill may be changed based on the determination result (for example, the color may be changed or the fill may be performed). Blinking). More specifically, it is conceivable to determine a reliability coefficient that expresses the reliability of the obtained measurement result in a stepwise manner, and to control the fill display form based on the determination result. As a calculation method of the reliability coefficient, for example, the deviation amount between the elliptical shape when the ellipse is approximated based on the output signal of the light receiving element and the actual light receiving signal detected by the light receiving element is calculated for each meridian direction. A method may be considered in which the reliability coefficient is determined based on the total sum of the deviation amounts.

  Here, as the reliability coefficient, the high reliability is expressed in six stages of 9, 8, 7, 6, 5, and E (minimum value of the reliability coefficient). That is, assuming that the sum of the deviation amounts when determined to be the reliability coefficient 9 is 1 s, the reliability coefficient is 8 if 1 s <sum of the deviation amounts ≦ 2 s, and 2 s <sum of the deviation amounts ≦ 3 s. Is the reliability coefficient 7, and if 3s <total deviation amount ≦ 4s, the reliability coefficient 6; if 4s <total displacement amount ≦ 10s, the reliability coefficient 5; and 10s <total deviation amount ≦ 20s. Is a reliability coefficient E, and if the sum of the deviation amounts> 20 s, it is determined as a measurement error. Here, if the determined reliability coefficient is 8 or more, the control unit 70 sets the fill color to blue. If the determined reliability coefficient is 6 or 7, the fill color is yellow. Further, if the determined reliability coefficient is 5 or E, a method of changing the fill color to red can be considered. In this way, the reliability of the measurement result can be confirmed almost simultaneously with the confirmation of the end of measurement.

  When a predetermined number (for example, 6 times) of measurement errors continue in the eye refractive power measurement, “ERROR FINISH” is displayed on the display monitor 40 to notify the examiner and the measurement is stopped. When “ERROR FINISH” is displayed, the examiner removes the cause of the measurement error and then presses the measurement start switch 5b to cancel the measurement stop and adjust the alignment again. In the case of the automatic alignment and the auto shot mode, the auto shot measurement is resumed when the alignment is completed. At this time, only the measurement that is less than the predetermined number of eye refractive power measurements is performed, and when the predetermined number is reached, a display as shown in FIG. 4C is performed.

  When the measurement of one eye is completed, the measurement of the other eye is similarly performed. 5A shows a display screen of the display monitor 40 when the measurement is shifted from the measurement of the right eye to the measurement of the left eye. FIG. 5B shows the measurement of the left eye after the measurement of the right eye is completed. It is a display screen of the display monitor 40 at the time of completion | finish. In this way, the examiner can easily confirm the end of the measurement for both the left and right eyes by confirming the presence or absence of the fill corresponding to the measurement results for the left and right eyes.

  When the measurement results for both the left and right eyes satisfy a predetermined measurement end condition, the control unit 70 ends the measurement and outputs the measurement data to the printer 63. At this time, the measurement result may be printed out using the print switch 47. Thereafter, when there is an input signal to the clear switch 46 from the examiner, the control unit 70 clears the obtained measurement result and erases the fill added to the background in the area REF displaying the measurement result. Thereby, the display monitor 40 is in a state of waiting for alignment adjustment for the eye to be examined (see FIG. 4A). Note that when the measurement result is printed out, the measurement result may be cleared and the fill may be erased.

  The ophthalmologic apparatus according to the second embodiment will be described below. The ophthalmologic apparatus according to the second embodiment is obtained by adding a function of measuring the corneal shape of the eye E to the ophthalmologic apparatus having the ocular refractive power measurement function shown in the first embodiment. . In this case, the ring index projection optical system 30 is also used as an index projection optical system for measuring the corneal shape, and the control unit 70 determines the corneal shape of the eye E based on the shape of the ring index image R imaged by the image sensor 21. Measure. In the following description, the case where the continuous measurement mode of the corneal shape and the eye refractive power is selected will be described.

  FIG. 6 is a diagram illustrating a display screen of a display monitor in the ophthalmologic apparatus according to the second embodiment. In this case, FIG. 6 shows a measurement result of only the measurement eye, but a region REF where the measurement result of the eye refractive power is displayed and a region K where the measurement result of the corneal shape is displayed are prepared. In K, the number of measurements, the corneal curvature radius R1 in the weak main meridian direction, and the corneal curvature radius R2 in the strong main meridian direction are displayed in order from the top.

  FIG. 6A is a display screen before the measurement is performed. Here, as described above, after the rough alignment by the examiner is completed, the measurement starts when the alignment with respect to the eye E is completed.

  When the measurement is started, the control unit 70 first performs continuous measurement of the corneal shape of the eye E, and updates the number of times of measurement and the content of the measurement result every time the measurement of one corneal shape is completed. The measurement is continued until a predetermined number (for example, three) of measurement values excluding the measurement error is obtained.

  When a predetermined number of measurement values are obtained, the control unit 70 determines that the corneal shape measurement end condition is satisfied, and fills the background in the region K displaying the measurement result of the corneal shape with a predetermined color ( Hatching N), the measurement result displayed in the region K is highlighted (see FIG. 6B). Then, the control unit 70 proceeds to the eye refractive power measurement, performs continuous measurement of the eye refractive power, and when a predetermined number (for example, three) of measurement values excluding the measurement error is obtained, the measurement end condition of the eye refractive power is obtained. And the background in the region REF displaying the measurement result of the eye refractive power is filled with a predetermined color (hatching N), so that the measurement result displayed in the region REF is highlighted (FIG. 6). (See (c)).

  In this way, when measuring a plurality of functions of the eye to be examined, it can be easily confirmed that either one of the measurements has been completed. In the above measurement, the measurement of the corneal shape is set to be performed a predetermined number of times (for example, 3 times) regardless of the measurement error, and when the predetermined number of times is completed, the measurement is shifted to the measurement of eye refractive power It may be. When a predetermined number (for example, three) of measured values of eye refractive power excluding measurement errors are obtained, the control unit 70 determines that the eye refractive power measurement termination condition is satisfied, and temporarily stops the measurement (see FIG. 7). ). Here, the control unit 70 indicates that the measurement of the corneal shape does not satisfy the predetermined measurement end condition on the display monitor 40 (a predetermined number (for example, three) of measurement values excluding measurement errors is not obtained). A character is displayed, and a predetermined color (for example, light blue) is painted (hatched N2) on the background in the region K in which the measurement result of the corneal shape is displayed. Thereby, the examiner can easily confirm that either measurement has not been completed. In this case, when the measurement start switch 5b is pressed again, the measurement of the deficiency is started.

  Note that the present invention can also be applied to a case where the measurement of the cornea shape and the measurement of the eye refractive power are alternately performed every time. In this case, if either one of the measurement results satisfies a predetermined measurement end condition, a method may be considered in which the background in the area displaying the measurement result that satisfies the measurement end condition is filled.

  In addition, as described above, the fill of the predetermined color added to the background in the area where the measurement result is displayed may be a fill that completely hides the background, a fill that allows the background to be seen as if it is translucent, etc. Conceivable. In the case of translucent filling, the eye to be examined can be observed from the background, so that alignment and the like for the next measurement can be easily performed.

1 is an external configuration diagram of an ophthalmologic apparatus according to a first embodiment. It is a schematic block diagram for demonstrating the structure of the optical system of the ophthalmic apparatus which concerns on this embodiment, and a control system. It is a flowchart at the time of selecting the continuous measurement mode of eye refractive power. It is a figure explaining the display screen of a display monitor in the case of measuring the eye refractive power of a right eye. It is a figure explaining the display screen of a display monitor in the case of measuring the eye refractive power of a left eye after completion | finish of measurement of a right eye. It is a figure which shows the display screen of the display monitor in the ophthalmologic apparatus which concerns on 2nd Embodiment. It is a figure explaining the display screen of a display monitor in the case of measuring several functions of a to-be-examined eye. It is a figure explaining the display method of the conventional measurement result.

Explanation of symbols

4 Measurement unit 10 Eye refractive power measurement optical system 22 Observation optical system 40 Display monitor 70 Control unit REF Area where measurement result of eye refractive power is displayed K Area where measurement result of corneal shape is displayed N Filled

Claims (3)

A measurement unit having measurement means for measuring the eye to be examined, an imaging means for photographing the eye to be examined to obtain an eye image, an eye image obtained by the photographing means, and a measurement result obtained by the measurement unit An ophthalmologic apparatus comprising: a display unit configured to display a combined display; a determination unit that determines whether a measurement result obtained by the measurement unit satisfies a predetermined measurement end condition; and a predetermined measurement end by the determination unit Display control means for performing control to highlight the measurement result by painting a background in a region in which the measurement result is displayed with a predetermined color when it is determined that the condition is satisfied. Ophthalmic device. The ophthalmologic apparatus according to claim 1, further comprising a determination unit that determines a reliability of the measurement result obtained by the measurement unit, wherein the display control unit displays the fill based on the determination result obtained by the determination unit. An ophthalmologic apparatus characterized by changing a state. The ophthalmologic apparatus according to claim 2, wherein the display control unit changes the color of the fill based on a determination result of the determination unit.

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