JP6680216B2 - Eye refractive power measuring device - Google Patents

Description

  The present disclosure relates to an eye refractive power measurement device that objectively measures the eye refractive power of an eye to be inspected.

  For example, Patent Document 1 is known as an attempt to reduce the labor of an examiner in an eye-refractive-power measuring device that objectively measures the eye-refractive power of an eye to be inspected. In Patent Document 1, a detection signal from a touch sensor provided on a chin rest is used as a trigger to start an alignment operation for an eye to be inspected. Further, in Patent Document 1, when measuring the interpupillary distance of the eye to be inspected, a camera capable of photographing both eyes is used.

JP 2006-280612A

  However, in the case of the configuration of Patent Document 1, it is always necessary to provide the touch sensor. In addition, a camera capable of capturing binocular images is always required for measuring the interpupillary distance.

  An object of the present invention is to provide an eye-refractive-power measuring device whose technical problem is to solve at least one problem of the conventional technique.

  In order to solve the above-mentioned subject, the present disclosure is characterized by having the following configurations.

(1) An examination window for a subject to look through, a measurement optical system for objectively measuring the eye refractive power of the subject's eye through the examination window, and a fixation for the subject's eye through the examination window. A fixation target presenting optical system for presenting an optotype, a presentation position changing means for changing the presenting position of the fixation target for the eye to be examined in the optical axis direction, and a relative position of the measurement optical system for the eye to be examined. Relative position detecting means for detecting, and drive control means for activating automatic alignment by moving the measurement optical system with respect to the eye to be inspected based on the detection result from the relative position detecting means, the eye of the eye to be inspected An eye-refractive-power measuring device for measuring refracting power, which starts an operation of automatic alignment by the drive control means triggered by a detection signal from the eye detection means for detecting reflection from an eye to be inspected, and the eye detection means. Control means, and An eye refractive power measuring device characterized by the above .

  According to the present disclosure, at least one problem of the related art can be solved.

It is a figure which shows an example of the external appearance of the apparatus which concerns on this embodiment. It is a figure which shows an example of the optical system and control system which concern on this embodiment. 6 is a flowchart showing an example of the operation of the device according to the present embodiment. FIG. 4 is an explanatory diagram showing an example of measuring an interpupillary distance by the device according to the present embodiment.

  An example of an embodiment of the present disclosure will be described based on the drawings.

  FIG. 1 is a diagram showing an example of the external appearance of the device according to the present embodiment. An eye-refractive-power measuring device (hereinafter, referred to as a device) 1 includes at least an inspection window 2 and a measuring unit 3. The inspection window 2 is a window through which the measurement eye of the subject can be seen, and is provided, for example, at a position fixed to the casing of the device 1 (for example, the subject-side casing).

  The measuring unit 3 is provided inside the device 1 and incorporates the measuring optical system 10. The drive unit 6 is provided to move the measuring unit 3 with respect to the subject's eye. The drive unit 6 includes an actuator (for example, a motor) to move the measuring unit 3. The drive unit 6 may move the measuring unit 3 three-dimensionally with respect to the subject's eye, for example. In this case, the driving unit 6 moves the measuring unit 3 in the left-right direction (X direction), the front-back direction (Z direction), and the up-down direction (Y direction). Further, when the inspection window 2 is fixed to the device housing, the drive unit 6 moves the measurement unit 3 with respect to the inspection window 2.

  In addition to the inspection window 2, the other-eye imaging optical system 200 may be provided on the subject-side housing surface of the device 1. The other-eye imaging optical system 200 is provided to image another eye different from the measurement eye measured by the measurement optical system 10. The other-eye imaging optical system 200 is arranged at a position different from the inspection window 2. The other-eye imaging optical system 200 may include an image sensor 202.

  A forehead 4 may be provided on the subject-side housing surface of the device 1. The forehead 4 is provided, for example, to stabilize the face of the subject. In addition, in the present embodiment, the chin rest is not provided for facilitating the examinee to look through the inspection window 2, but the chin rest may of course be set.

  A display unit 70 may be provided on the subject-side housing surface of the device 1. On the display unit 70, for example, the measurement result by the measurement optical system 10 is displayed. In this case, the display unit (display screen) 70 may be arranged at the same height as the measuring unit 3. Thereby, the subject can view the display screen of the display unit 70 without moving the height of the face with respect to the measurement position of the measurement optical system 10. The display unit 70 may be a touch panel or may be used as an operation receiving unit that receives an operation from the subject.

  Further, the operation unit 300 may be provided on the subject-side housing surface of the device 1. The operation unit 300 may be used, for example, to confirm whether or not the measurement result is good, or may be used to make various settings in the measurement.

  FIG. 2 is a diagram showing an example of the optical system and the control system according to the present embodiment. The measurement unit 3 is provided with at least a measurement optical system 10 and a fixation target presenting optical system 30. Further, the measurement unit 3 is provided with a ring index projection optical system 45, a working distance index projection optical system 46, and an observation optical system (imaging optical system) 50 as a configuration for performing alignment detection with respect to the eye to be inspected. Has been.

  The measurement optical system 10 is provided, for example, to objectively measure the eye refractive power of the eye to be inspected through an inspection window. The measurement optical system 10 has a projection optical system (light projecting optical system) 10a and a light receiving optical system 10b. The projection optical system 10a is provided for projecting a measurement index onto the fundus Ef of the eye E through the pupil of the eye E (measurement eye) E, for example. The light receiving optical system 10b is provided, for example, to receive the fundus reflected light by the measurement index projected by the projection optical system 10a. As the optical arrangement of the measurement optical system 10, a known optical system used in an autorefractometer can be used. An example is shown below.

  More specifically, the projection optical system 10a includes a measurement light source 11, a relay lens 12, a hall mirror 13, and an objective lens 14 arranged on the optical axis L1 of the measurement optical system 10.

  The light source 11 is a light source for projecting a spot-shaped measurement target on the fundus oculi Ef through the center of the pupil of the eye E to be examined. The light source 11 has a positional relationship that is optically conjugate with the fundus Ef of the emmetropic eye.

  The hole mirror 13 is provided with an opening that allows the light flux from the light source 11 through the relay lens 12 to pass therethrough. The hole mirror 13 is in a position optically conjugate with the pupil of the eye E.

  In the light receiving optical system 10b, the hole mirror 13 of the projection optical system 10a and the objective lens 14 are shared with the projection optical system 10a. Further, the light receiving optical system 10b is arranged on the optical axis L2 in the reflection direction of the hall mirror 13, the relay lens 16, the total reflection mirror 17, and the optical axis L2 in the reflection direction of the total reflection mirror 17. Further, it includes a light receiving diaphragm 18, a collimator lens 19, a ring lens 20, and a two-dimensional image pickup device 22 (hereinafter referred to as "image pickup device 22") including an area CCD or the like.

  The light-receiving diaphragm 18 and the image sensor 22 are in a positional relationship that is optically conjugate with the fundus oculi Ef. The ring lens 20 is an optical element for forming the fundus reflected light in a ring shape. The ring lens 20 has a ring-shaped lens portion and a light-shielding portion in which a region other than the lens portion is coated with a light-shielding material. Further, the ring lens 20 has a positional relationship that is optically conjugate with the pupil of the eye E to be inspected. The ring-shaped fundus reflected light (that is, the two-dimensional pattern image) that has passed through the ring lens 20 is received by the image sensor 22. The image pickup element 22 outputs the image information of the received two-dimensional pattern image to the calculation control unit 100 (hereinafter, referred to as the control unit 100). This makes it possible to display a two-dimensional pattern image on the display unit 70 and calculate the refractive power of the eye E to be inspected based on the two-dimensional pattern image.

  The measurement optical system 10 is not limited to the one described above, and the projection optical system that projects the measurement light toward the fundus Ef of the eye to be examined and the light receiving element that receives the reflected light acquired by the reflection of the measurement light on the fundus Ef. Any measurement optical system having a light receiving optical system for receiving light by For example, the eye refractive power measurement optical system may be configured to include a Shack-Hartmann sensor. Of course, another measurement type device may be used (for example, a phase difference type device that projects a slit).

  A beam splitter 29 is arranged between the objective lens 14 and the hole mirror 13. The beam splitter 29 guides a light flux from a fixation target presenting optical system 30 described later to the eye E to be inspected, and guides reflected light from the anterior segment Ec of the eye E to the observation optical system 50. Further, the beam splitter 29 transmits the fundus reflected light emitted from the light source 11 and reflected by the fundus Ef, and guides it to the light receiving optical system 10b.

  The fixation target presenting optical system 30 is provided to present the fixation target to the eye to be examined through the examination window 2. The fixation target presenting optical system 30 includes, for example, a visible light source 31, a fixation target plate 32 having a fixation target, a light projecting lens 33, a beam splitter 29, and an objective lens 14. By turning on the visible light source 31, the fixation target included in the fixation target plate 32 is presented to the eye E. The visible light source 31 and the fixation target plate 32 are configured to be movable in the optical axis L3 direction by a slide mechanism (not shown). The visible light source 31 and the fixation target plate 32 are moved in the direction of the optical axis L3, whereby the cloud of the eye E to be inspected is performed. When moving the presentation position of the fixation target in the optical axis direction, the lens system may be moved.

  A ring index projection optical system 45 and a working distance index projection optical system 46 are arranged in front of the anterior segment of the eye E to be examined. The ring index projection optical system 45 is an optical system that emits near-infrared light for projecting the ring index onto the cornea Ec of the eye E to be examined. The ring index projected on the cornea Ec can also be used as an index for measuring the shape of the cornea. The ring projection optical system 45 can also be used as anterior segment illumination for illuminating the anterior segment of the subject's eye E. On the other hand, the working distance index projection optical system 46 is an optical system that emits near-infrared light for projecting the infinity index onto the cornea Ec of the eye E to be examined. The position of the optometry apparatus 1 with respect to the eye E can be aligned based on the position of the infinity index with respect to the cornea Ec.

  In the observation optical system (imaging optical system) 50, the objective lens 14 and the beam splitter 29 are shared with the fixation target presenting optical system 30, and the half mirror 35, the imaging lens 51, and the two-dimensional imaging element (hereinafter, Image pickup element) 52. The two-dimensional image pickup element 52 has an image pickup surface arranged at a position substantially conjugate with the anterior segment of the eye E to be inspected. An image of the anterior segment of the eye E is captured by the two-dimensional image sensor 52. The output from the two-dimensional image sensor 52 is input to the control unit 100, and as a result, the anterior segment image of the eye E to be inspected captured by the two-dimensional image sensor 52 is displayed on the monitor 70. In the present embodiment, the observation optical system 50 also serves as an optical system that detects the alignment index image formed on the cornea of the eye E by the working distance index projection optical system 46. The position of the alignment index image is detected based on the result of the alignment index image captured by the two-dimensional image sensor 52.

  Next, the control system of the device 1 will be described. The device 1 has a control unit 100 as a main control system. The control unit 100 is a processing device having an electronic circuit that performs a control process of each unit of the device 1 and a calculation process of a measurement result. The control unit 100 is electrically connected to each of the light sources 11 and 31, the image pickup device 22, the image pickup device 52, and the image pickup device 202, and the drive unit 6, the display unit 70, the operation unit 300, the memory 105, and the position detection sensor 400. ing.

  The control unit 100 includes a CPU 101, a ROM 102, and a RAM 103. The CPU 101 is a processing device that executes various processes related to the device 1. The ROM 102 is a non-volatile storage device in which a control program and fixed data for the CPU 101 to perform various controls of the ophthalmologic apparatus 1 are stored.

  The RAM 103 is a rewritable volatile storage device. The RAM 103 stores, for example, temporary data used for measuring the eye E to be examined by the ophthalmologic apparatus 1.

  The memory 105 is, for example, a rewritable nonvolatile storage device. At least a program for operating the present apparatus is stored in the memory 105.

The position detection sensor 400 is a sensor for detecting the position of the measurement unit 3. The position detection sensor 400 is used to detect the position of the measurement eye in the left-right direction when measuring the interpupillary distance of the subject. As the position detection sensor 400, for example, an origin sensor that detects whether or not the measurement unit 3 is at a predetermined position is provided near the drive unit 6, and the rotation speed can be detected as an actuator in the left-right direction of the drive unit 6. It is conceivable to use a motor. The position detection sensor 400 is not limited to this, and may be a sensor that detects the position of the measurement unit 3 using a potentiometer or a rotary encoder.
<Operation>
The operation of the apparatus having the above configuration will be described. FIG. 3 is a flowchart showing an example of the operation of the device according to the present embodiment.

  The examiner operates the operation unit to perform various settings as a preparation for the measurement. For example, the identification information for identifying the subject is set. In this case, the control unit 100 may control the notification unit and give an operation explanation. As the notification unit, for example, the display unit 400 can be considered. In this case, instead of the display unit 400, a voice generation unit may be provided to give a voice explanation.

  When the various settings are completed, the control unit 100 guides the subject to look into the inspection window (for example, notifies a message that the inspection window is to be seen). When the subject looks through the examination window, the reflected light from the subject's eye due to the anterior ocular segment illumination is detected by the image sensor 52.

<Detection of reflected light from the eye to be examined>
The control unit 100 executes a detection process of reflected light from the eye to be inspected, based on the image pickup signal from the image pickup element 52. The reflected light from the eye to be inspected may be, for example, light reflected by the alignment index (eg, ring index R) projected onto the eye to be inspected, or before the anterior segment image is formed by anterior segment illumination. It may be eye part reflected light (anterior eye part image Ea).

  More specifically, the control unit 100 executes a process of detecting reflected light (for example, corneal reflection bright spot) by the alignment index projected on the eye to be examined, and determines whether or not the reflected light is detected. Good. In addition, the control unit 100 executes a process of extracting a characteristic portion (for example, a pupil, an iris, etc.) of the eye to be inspected illuminated by the anterior segment illumination by image processing, and determines whether or not the characteristic portion is detected. May be. Note that the control unit 100 may start the position detection of the eye to be inspected during the process of detecting the reflected light from the eye to be inspected (details will be described later).

  In the above detection process, when it is determined that the reflected light from the subject's eye is detected, the control unit 100 uses this as a trigger to activate the automatic alignment for the subject's eye, and also to temporarily measure the eye refractive power by the measurement optical system. And the fixation position control is started. In this case, the automatic alignment and the temporary measurement may be started at the same time, or either one may be started first.

<Automatic alignment operation>
When activating the automatic alignment, the control unit 100 detects the alignment state of the measurement unit 3 with respect to the eye to be inspected based on the image pickup signal from the image pickup device 52 by a predetermined alignment detection method. As a result, the relative position of the measurement optical system 10 with respect to the subject's eye is detected.

  More specifically, the control unit 100 may obtain the alignment state in the vertical and horizontal directions with respect to the eye to be inspected, for example, based on the center coordinates of the ring index R. Further, when the measuring unit 3 shifts in the working distance direction, the control unit 100 hardly changes the interval of the infinity index M described above, whereas the image interval of the ring index R in the predetermined meridian direction changes. It is also possible to obtain the alignment state in the working distance direction with respect to the eye to be inspected (see, for example, JP-A-6-46999). The alignment detection method is not limited to the above method, and may be any method that can detect the alignment state with respect to the eye to be inspected. For example, the position of the characteristic portion of the eye to be inspected may be detected by image processing. Further, a light receiving element different from the observation optical system 50 may be provided and the alignment state may be detected based on the light receiving signal from the light receiving element (for example, the alignment light is emitted obliquely to the eye to be inspected, The reflected light may be detected from the diagonally opposite direction).

  The control unit 100 controls the drive unit 6 based on the detection result of the alignment state, and moves the measurement unit 3 toward the subject's eye. More specifically, the control unit 100 detects the positional shift amount with respect to the eye to be inspected based on the image pickup signal from the image pickup device 52, and controls the drive unit 6 so that the detected positional shift amount satisfies the allowable range. . In this case, the control unit 100 does not necessarily need to detect the positional deviation amount, but may detect the alignment deviation direction and move the measurement unit 3 in the direction in which the alignment deviation is corrected.

<Temporary measurement and fixation position control>
In the temporary measurement, the control unit 100 controls the measurement optical system based on the reflected light detection trigger signal to measure the eye refractive power of the eye to be inspected. More specifically, the control unit 100 may turn on the light source 11 based on the reflected light detection trigger signal. The measurement light emitted from the light source 11 is transmitted through the dichroic mirror 15 via the relay lens 12 to the objective lens 14, and then is projected onto the fundus of the eye E to be examined via the pupil of the eye E to be examined. Then, the reflected light from the fundus is condensed by the objective lens 14 via the pupil of the eye to be examined and the dichroic mirror 15, and is collected again on the aperture of the light receiving diaphragm 18 via the hall mirror 13 to the total reflection mirror 17. The light is converted into a substantially parallel light beam (in the case of an emmetropic eye) by the collimator lens 19, extracted as a ring-shaped light beam by the ring lens 20, and received by the image pickup element 22 as a ring image. Then, the control unit 70 calculates the eye refraction value of the subject's eye based on the image position of the ring image captured by the image sensor 22.

  Next, the control unit 100 moves the presentation position of the fixation target according to the eye refraction value of the eye to be obtained as described above so that the fixation target is located at a position conjugate with the fundus of the eye. Let This makes it possible to stabilize the fixation state even for a subject with strong myopia or hyperopia. For example, the time until the completion of automatic alignment can be shortened, and the main measurement of the eye refractive power can be smoothly performed.

<Begin main measurement of eye refractive power>
Here, the control unit 100 determines whether or not the alignment state of the measurement unit 3 with respect to the eye to be inspected is appropriate, depending on whether or not the alignment state in the XYZ directions is within a predetermined allowable range, and if it is appropriate. For example, a trigger signal (measurement start signal) is automatically issued to perform the main measurement of the eye refractive power measurement, and the measurement result of the main measurement is output to the display unit. In this case, the control unit may output the obtained measurement result to an external device (for example, a subjective optometer). The subjective optometer may include a subjective refractor. Further, the measurement optical system of the present embodiment may be provided with a subjective measurement function, and the obtained measurement result may be used as an initial value when performing the subjective measurement.

  In addition, after the alignment state satisfies the allowable range, the control unit 100 may perform the preliminary measurement of the eye refractive power again before the main measurement. In this case, the control unit 100 moves the presentation position of the fixation target based on the result so that the fixation target comes to a position conjugate with the fundus of the eye to be inspected, and further, by the applied diopter amount, the cloud. Move so that it will take. The control unit measures the eye refractive power in a state in which the eye to be inspected is fogged and outputs the measurement result to the display unit.

  When the measurement of one eye is completed as described above, the control unit 100 issues a message to the effect that the opposite eye looks into the inspection window 2. After that, as in the case of one eye, the control unit 100 executes control for measuring the eye refractive power of the other eye.

  After that, when the measurement result of the eye refractive power with both eyes is obtained, the control unit 100 may display the measurement result with both eyes on the display unit 70. In addition, the control unit 100 may output the obtained measurement results of both eyes to an external device (for example, an optometer for consciousness). The subjective optometer may include a subjective refractor. Further, the measurement optical system of the present embodiment may be provided with a subjective measurement function, and the obtained measurement result may be used as an initial value when performing the subjective measurement.

  In the above description, it is preferable that the fixation target is presented to the subject's eye in advance before the reflection from the subject's eye is detected. According to this, for example, the fixation direction of the subject when looking through the inspection window is guided, so that the measurement optical system can be smoothly guided within the movable range. The trigger for presenting the fixation target may be, for example, the start or completion of the setting work.

<Measurement of interpupillary distance>
Hereinafter, as an additional operation, a case of measuring the interpupillary distance of the subject will be described. FIG. 4 is an explanatory diagram showing an example of measuring the interpupillary distance with the device according to the present embodiment. In this embodiment, the interpupillary distance can be measured when measuring the eye refractive power of one eye.

  The control unit 100 may measure the interpupillary distance of the subject's eye based on the detection result from the position detection sensor 400 and the imaging result from the imaging element 202. The obtained measurement result may be output to the display unit 70 or an external device, like the measurement result of the eye refractive power.

  More specifically, the control unit detects the position of the measurement eye based on the detection result from the position detection sensor 400, and detects the position of the other eye based on the imaging result from the image sensor 202. When detecting the position of the measurement eye, for example, the control unit acquires the position of the measurement unit 3 in a state where the alignment with respect to the eye to be inspected is completed by the automatic alignment control. When detecting the position of the other eye, for example, the control unit 100 images the other eye in a state where the alignment with respect to the subject's eye is completed by the automatic alignment control. The control unit 100 detects the position of the other eye based on the captured image. As a method of detecting the position of the other eye, the same method as the method of detecting the relative position of the measurement optical system with respect to the measurement eye can be used.

  When obtaining the interpupillary distance, for example, the correspondence relationship between the position of the measurement unit 3 and the distance of the measurement unit 3 with respect to the optical axis of the imaging optical system 200 is obtained in advance and stored in the memory 105 in advance. Accordingly, the control unit 100 can obtain the distance A of the measurement eye with respect to the optical axis L200 of the imaging optical system 200 by acquiring the position of the measurement unit 3. Further, the control unit 100 can obtain the distance B of the other eye with respect to the optical axis of the imaging optical system 200. The control unit 100 can obtain the interpupillary distance PD based on the distance A and the distance B. Regarding the distance B of the other eye, when the other eye is detected at a position closer to the measurement eye than the optical axis of the imaging optical system 200, the distance B is subtracted from the distance A. On the other hand, when the other eye is detected at a position farther from the measurement eye than the optical axis of the imaging optical system 200, the distance B is added to the distance A.

  As described above, the interpupillary distance can be measured without necessarily providing the binocular camera by using the detection result from the position detection sensor and the imaging result from the imaging element that images the other eye.

  Further, in the present embodiment, since the rough alignment with respect to the eye to be inspected is performed by looking into the inspection window, the positions of the left and right eyes are likely to change with respect to the apparatus. Therefore, by using the detection result from the position detection sensor and the imaging result from the image sensor, the positions of both eyes can be properly detected and the interpupillary distance can be appropriately measured even in the above situation.

  The left and right eyes may be discriminated using the image sensor 52 and the image sensor 202 (the positional relationship between them is known). Further, the position of the measurement eye is detected based on the image pickup signal from the image pickup device 52, the position of the other eye is detected based on the image pickup signal with the image pickup device 202, and the interpupillary distance is measured based on these detection results. You may do it.

  In the above description, the position of the optical axis of the imaging optical system 200 is used as a reference, but the present invention is not limited to this. For example, some reference position may be set in the left-right direction of the subject. That is, if the relative positional relationship between the measurement unit 3 and the imaging optical system 200 is obtained in advance, the detection results of both can be associated and the interpupillary distance can be measured.

  For example, the initial position of the measuring unit 3 may be used as a reference. In this case, the control unit 100 can obtain the distance C of the measurement eye from the initial position by acquiring the position of the measurement unit 3. Further, the control unit 100 can obtain the distance D of the other eye with respect to the imaging optical axis L200. Here, the distance E between the initial position of the measuring unit 3 and the optical axis of the imaging optical system 200 is obtained in advance and stored in the memory 105 in advance. Therefore, the control unit can obtain the interpupillary distance based on the distance C, the distance D, and the distance E.

  When obtaining the detection result from the position detection sensor and the image pickup result from the image sensor, the alignment completion may be used as a trigger to obtain the detection result from the position detection sensor and simultaneously image the other eye. It is possible to prevent the shift of the measurement result due to the movement of the subject.

  In the above description, the reflected light from the eye to be inspected is detected by using the reflected light from the anterior segment of the eye to be inspected through the inspection window, but the present invention is not limited to this. For example, the reflected light from the fundus of the subject's eye looking through the examination window may be used to detect the reflected light from the subject's eye. For example, the control unit projects the measurement light beam from the measurement optical system in advance, and when the measurement light beam from the fundus is received by the image sensor 22, the control unit activates the automatic alignment with respect to the eye to be examined, and at the same time, the measurement optical system. The provisional measurement of the eye refractive power and the fixation position control by may be started.

  Note that the fixation target presenting optical system 30 may include a plurality of fixation targets having different light flux diameters of the fixation light flux. Fixation target presenting optical system 30, for example, a first projection optical system for projecting a first fixation target formed by a light beam diameter limited from the optical axis direction of the measurement optical system 10 onto an eye to be examined, and a first projection A second projection optical system that projects a second fixation target formed by a light beam diameter larger than that of the optical system onto the subject's eye may be provided. As a configuration for forming the first fixation target, for example, a diaphragm for limiting the fixation light flux is arranged in the optical path. Also, a laser light source may be used. Further, as the second fixation target, a configuration (for example, an optotype plate, a display, etc.) for forming a predetermined pattern (may be a figure, a character, or a mark) is used. Further, the control unit 100 may control the fixation target presenting optical system 30 to switch from the first fixation target to the second fixation target. For example, the control unit 100 switches the fixation target by detecting eye reflection or by using an alignment completion signal as a trigger. As a result, the fixation operation of the eye to be inspected can be performed smoothly.

  In the above configuration, an optical system for objectively measuring the eye refractive power of the subject's eye is used as the measurement optical system 10, but the present invention is not limited to this, and an optical system for examining the subject's eye. If so, the present embodiment can be applied.

2 inspection window 3 measuring unit 10 measuring optical system 30 fixation target presenting optical system 50 observation optical system 100 control unit 200 other-eye imaging optical system 400 position detection sensor

Claims (4)

An inspection window for the examinee to look through,
A measurement optical system that objectively measures the eye refractive power of the eye to be examined through the inspection window,
A fixation target presenting optical system for presenting a fixation target to the eye to be examined through the inspection window,
Presentation position changing means for changing the presentation position of the fixation target presented to the eye to be examined in the optical axis direction,
Relative position detection means for detecting the relative position of the measurement optical system with respect to the eye to be inspected, and drive for activating automatic alignment by moving the measurement optical system with respect to the eye to be inspected based on the detection result from the relative position detection means Control means,
An eye-refractive-power measuring device for measuring the eye-refractive power of an eye to be examined,
Eye detection means for detecting reflection from the eye to be inspected,
Control means for starting the operation of automatic alignment by the drive control means triggered by the detection signal from the eye detection means,
An eye-refractive-power measuring device comprising:   The control means further uses the detection signal from the eye detection means as a trigger to automatically measure the eye refractive power of the eye to be inspected by the measurement optical system before the alignment by the automatic alignment means is completed, The eye refractive power measurement device according to claim 1, wherein the fixation target is moved to a position corresponding to a measurement result. An image pickup unit which is arranged at a position different from the inspection window and which picks up another eye different from the measurement eye by the measurement optical system,
Position detecting means for detecting the position of the measuring optics,
An interpupillary distance measuring means for measuring an interpupillary distance of the eye to be inspected based on an imaging result from the imaging means and a detection result from the position detecting means,
The eye refractive power measuring device according to claim 1, further comprising: The inspection window is provided at a position fixed with respect to the device housing,
The eye refractive power measurement according to any one of claims 1 to 3, wherein the measurement unit including the measurement optical system is provided inside the apparatus housing and is movable with respect to the inspection window. apparatus.

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