JP2020069201A - Optometry system - Google Patents

Abstract

To provide an optometry system which allows for easily confirming the position of the sight line of an eye to be examined and performing appropriate optometry.SOLUTION: The optometry system for projecting a target on an eye to be examined and measuring the optical characteristics of the eye to be examined comprises: acquisition means which acquires the anterior eye part of the eye; detection means which detects the position of a sight line where the eye gazes the target on the basis of the anterior eye image; determination means which determines a gazing state in which the eye gazes the target on the basis of the position of the sight line; and output means which outputs gaze information for indicating the gazing state on the basis of a determination result of the determination means.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to an optometry system for measuring optical characteristics of an eye to be examined.

  In the optometry system, a subjective optometry apparatus that subjectively measures the optical characteristics of the subject's eye and an objective optometry apparatus that objectively measures the optical characteristics of the subject's eye are used. The subjective optometry apparatus arranges an optical member (for example, a spherical lens, a cylindrical lens, or the like) in front of the subject's eye, and presents the subject with an optotype through the optical member, whereby The characteristic (eye refractive power) is measured (patent document 1). The objective optometry apparatus measures the optical characteristics (eye refractive power) of the eye to be examined by irradiating the fundus of the eye to be examined with a target light flux and detecting a reflected light flux that is reflected by the fundus of the eye ( Patent Document 2).

JP-A-5-176893 JP, 10-33479, A

  At the time of the optometry, the examiner instructs the subject to look at the optotype, but it may not be possible to perform an appropriate optometry because it is not known whether the subject actually looks at the optotype. For example, in the subjective measurement, an optotype is presented to the subject, and it is determined from the contents of the response of the subject whether or not the optotype is visible. However, it is difficult to judge the case where the examinee answers by looking at an optotype different from the optotype instructed by the subject, and a correct measurement result cannot be obtained in such a state. Further, for example, in the objective measurement, the optical characteristics are measured by irradiating the subject with the measurement light flux while fixing the visual target and obtaining the reflected light flux. However, in some cases, the measurement was performed while the subject was not gazing at the optotype, and accurate measurement results could not be obtained.

  In view of the above-mentioned conventional technique, the present disclosure has an object to provide an optometry system capable of easily confirming the position of the line of sight of the subject's eye and performing an appropriate optometry.

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

  (1) An optometry system according to a first aspect of the present disclosure is an optometry system for projecting an optotype on an eye to be measured and measuring optical characteristics of the eye, wherein an anterior segment image of the eye is obtained. Acquiring means to acquire, based on the anterior ocular segment image, detection means for detecting the position of the line of sight at which the subject eye gazes at the optotype, based on the position of the line of sight, the eye to be examined is the optotype A determining means for determining a gaze state to gaze, based on the determination result of the determining means, an output means for outputting gaze information for indicating the gaze state in which the eye to be gazed at the visual target, Is characterized by.

It is an external view of an optometry apparatus. It is a figure which shows a measurement part. It is the schematic block diagram which looked at the inside of the optometry apparatus from the front direction. It is the schematic block diagram which looked at the inside of the optometry apparatus from the side direction. It is the schematic block diagram which looked at the inside of the optometry apparatus from the upper surface direction. It is a figure which shows the control system of an optometry apparatus. It is a figure which shows the fixation target which a test subject observes, and the monitor which an examiner observes. It is a figure which shows the test | inspection target which a test subject observes, and the monitor which a tester observes.

<Outline>
The outline of the optometry system according to the embodiment of the present disclosure will be described. The items classified by <> below can be used independently or in association with each other.

  The optometry system (for example, the optometry apparatus 1) according to the present embodiment projects an optotype on the subject's eye. The optotype may be at least one of a fixation target for fixing the eye to be inspected, an inspection target for measuring optical characteristics of the eye to be inspected, and the like. For example, when projecting a fixation target onto the eye to be inspected, in a state where the eye to be inspected is fixed on the fixation target, a target light flux is projected onto the fundus of the eye to be examined, and based on the reflected light flux, Objective optical properties of the eye may be measured. The optical characteristics of the eye to be measured thus measured may be eye refractive power (for example, spherical power, cylindrical power, astigmatic axis angle, etc.), axial length, corneal shape, and the like. Further, for example, when projecting the test target onto the eye to be inspected, in the state where the test target is presented to the eye to be examined, the target light flux from the test target is projected onto the eye to be examined, The subjective optical characteristics of the subject's eye may be measured by changing the optical characteristics. The optical characteristics of the eye to be measured thus measured are eye refractive power (for example, spherical power, cylindrical power, astigmatic axis angle, etc.), contrast sensitivity, binocular function (for example, oblique amount, stereoscopic function, Etc.) and the like.

  In the present embodiment, the optometry system may be an optometry system for subjectively measuring the optical characteristics of the subject's eye. In this case, the optometry system may be a consciousness optometry system including a consciousness measurement unit that subjectively measures the optical characteristics of the subject's eye. The subjective optometry system may include an optotype presenting unit capable of presenting an index to the subject's eye at a predetermined examination distance. The optotype presenting unit may be provided as a part of the subjective measuring unit, or may be provided separately from the subjective measuring unit. Further, in the present embodiment, the optometry system may be an optometry system for objectively measuring the optical characteristics of the subject's eye. In this case, the optometry system may be an objective optometry system including an objective measurement unit that objectively measures the optical characteristics of the subject's eye. Note that the optometry system may be an optometry system that includes both subjective measurement means and objective measurement means.

<Self-conscious measuring means>
In the present embodiment, the optometry system includes a subjective measurement unit (for example, a subjective measurement optical system 25) that subjectively measures the optical characteristics of the subject's eye. The subjective measurement means may include a projection optical system (for example, a projection optical system 30). The light projecting optical system projects the target luminous flux emitted from the target presenting unit (for example, the display 31) that presents the target onto the eye to be examined. Further, the subjective measuring unit may include a correction optical system (for example, the correction optical system 60). The correction optical system is arranged in the optical path of the projection optical system, and changes the optical characteristics (for example, at least one of spherical power, cylindrical power, cylindrical axis, polarization property, and aberration amount) of the target light flux. Let

  The correction optical system may have any configuration as long as it can change the optical characteristics of the target luminous flux. As an example, it may be configured to control the optical element. The optical element may be at least one of a spherical lens, a cylindrical lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, and the like. Of course, the optical element may be an optical element different from the above optical element.

  The correction optical system may be an optometry unit (phoropter) that is disposed in front of the eye of the subject and changes the optical characteristics of the target luminous flux by switching the optical elements. For example, the optometry unit has a lens disc in which a plurality of optical elements are arranged on the same circumference, and a drive unit (for example, a motor) for rotating the lens disc. A configuration in which elements are electrically switched may be used.

  The correction optical system controls the optical element by disposing an optical element between the optical member for guiding the target luminous flux from the projection optical system toward the eye to be examined and the target presenting unit. By doing so, the optical characteristics of the target luminous flux may be changed. That is, the correction optical system may have a configuration of a phantom lens refractometer (phantom correction optical system). In this case, the target luminous flux corrected by the correction optical system is guided to the subject's eye via the optical member.

<Objective measuring means>
In the present embodiment, the optometry system includes an objective measurement unit (for example, an objective measurement optical system 10) that objectively measures the optical characteristics of the subject's eye. The objective measuring means may include a projection optical system (for example, the projection optical system 10a). The projection optical system projects a target luminous flux onto the fundus of the eye to be examined. Further, the objective measuring means may include a light receiving optical system (for example, the light receiving optical system 10b). The light receiving optical system receives the reflected light flux obtained by reflecting the target light flux.

<Acquisition method>
In the present embodiment, the optometry system includes an acquisition unit (for example, the control unit 70). The acquisition unit acquires an anterior segment image (anterior segment information) of the subject's eye. The anterior ocular segment image of the subject's eye is an image obtained by photographing the anterior segment of the subject's eye. As an example, the anterior ocular segment image may be an image of the anterior ocular segment of the subject's eye on which no bright spot image is projected. Further, as an example, the anterior segment image may be an image of the anterior segment including the bright spot image projected on the subject's eye. Further, as an example, the anterior segment image may be an image of only the bright spot image projected on the subject's eye.

  The anterior ocular segment image of the eye to be inspected may be an anterior ocular segment image obtained by imaging one of the left and right eye to be inspected. That is, it may be an anterior segment image in which the left eye to be inspected is imaged, and an anterior segment image in which the right inspected eye is imaged. The anterior ocular segment image of the eye to be inspected may be an anterior ocular segment image in which both the left and right eye to be inspected are imaged. That is, it may be an anterior segment image in which the left eye and the right eye are imaged.

  The optometry system may include an anterior segment imaging unit that captures an anterior segment of the subject's eye (for example, an anterior segment imaging optical system 100). The anterior segment imaging unit may be an anterior segment imaging unit that is integrally provided with another member (for example, an optical system) in the optometry system. In such a case, the anterior segment imaging unit may be provided in one housing (for example, one optometry apparatus, etc.) together with other members in the optometry system.

  Further, the anterior ocular segment imaging unit may be an anterior ocular segment imaging unit provided exclusively for capturing an anterior ocular segment of the subject's eye in the optometry system. In such a case, the anterior segment imaging unit may be provided in a housing different from the housing in which other members of the optometry system are provided. As an example, the anterior segment imaging unit may be provided in a wearable device (for example, a glasses-type wearable terminal, a head mounted display, etc.). For example, the acquisition unit may acquire the anterior segment image of the subject's eye by receiving the anterior segment image captured by the anterior segment imaging unit provided in a different housing.

<Detection means>
In the present embodiment, the optometry system includes detection means (for example, the control unit 70). The detection means detects the position of the line of sight at which the eye to be examined gazes at the optotype based on the anterior segment image of the eye to be examined. The detection means may detect the position of the line of sight as a range including a predetermined area centered on the position of the line of sight.

  The optometry system may include support means (eg, chin rest 5). The support means supports the subject. The support means may support the subject by fixing the face of the subject. For example, in this case, a forehead support, a chin rest, or the like may be used as the support means. The optometry system may be configured such that the detection unit detects the position of the line of sight of the subject's eye while the subject is supported by the support unit. By providing the support means, it is possible to suppress the displacement of the face of the subject, etc., and to detect the position of the line of sight of the subject's eye more accurately.

  The detecting means is only required to be able to detect the position of the line of sight of the eye to be inspected, and its method is not limited. As an example, the detection unit may analyze the anterior segment image of the eye to detect the position of the pupil, and detect the position of the line of sight of the eye based on the position of the pupil. In this case, the position of the pupil may be any part of the pupil. For example, it may be at least one of the position of the center of the pupil and the position of the outer peripheral edge of the pupil.

  Further, as an example, the detection unit may analyze the anterior segment image of the eye to detect the position of the corneal apex, and detect the position of the line of sight of the eye to be inspected based on the position of the corneal apex. The position of the apex of the cornea may be detected based on the position of the optotype image projected on the subject's eye. When detecting the position of the line of sight from the position of the apex of the cornea of the eye to be inspected, the above-mentioned supporting means is particularly effective because the displacement of the face of the subject easily influences.

  In addition, as an example, the detection means detects both the position of the pupil and the position of the corneal apex by analyzing the anterior segment image of the eye to be inspected, and based on the position of the pupil and the position of the corneal apex, the line of sight of the eye to be inspected. The position of may be detected. In this case, the position of the line of sight of the eye to be inspected may be detected based on the deviation between the position of the center of the pupil and the position of the apex of the cornea.

  The detection means is an ocular potential method that utilizes the potential difference between the cornea of the eye to be examined and the retina, a corneal reflex method that uses the difference in reflectance between the cornea (black eye) and the sclera (white eye) of the eye to be examined, and The position of the line of sight of the subject's eye may be detected by using a film reflection method or the like.

<Judgment means>
In this embodiment, the optometry system includes a determination unit (for example, the control unit 70). The determining means determines a gaze state in which the eye to be examined gazes at the target based on the position of the line of sight of the eye to be examined.

  The determination means may determine in real time the gaze state in which the eye to be examined gazes at the target based on the position of the line of sight of the eye to be examined. In this case, the determining unit may sequentially determine the gaze state of the eye to be inspected, or may determine at predetermined time intervals (for example, 5 second intervals). For example, since the gaze state of the eye to be inspected is determined in real time, when the eye gaze state of the eye to be inspected is not appropriate, remeasurement of the eye to be inspected can be performed immediately. It is possible to efficiently measure the optical characteristics of the subject's eye because it is possible to reduce the need to repeat the measurement after the completion of the one measurement.

  The determination means may determine the degree to which the eye to be examined gazes at the optotype as the gaze state in which the eye to be examined gazes at the optotype. For example, in this case, the degree to which the eye to be examined gazes at the optotype may be determined based on the positional relationship of the line of sight of the eye to the optotype presented to the eye. As an example, as the position of the line of sight of the eye to be examined is closer to the target presented to the eye, it is determined that the eye is gazing at the target, and the line of sight of the eye from the target presented to the eye is determined. It may be determined that the farther the position is, the less the eye to be examined is gazing at the target. For example, the degree to which the eye to be examined gazes at the optotype may be represented by a numerical value or a graph.

  Further, the determination means may determine whether or not the eye to be inspected is gazing at the optotype as a gaze state in which the eye to be inspected gazing at the optotype. In this case, the determination means determines whether or not the position of the line of sight of the eye to be examined overlaps with at least a part of the eye target projected onto the eye to determine whether or not the eye to be examined is gazing at the eye target. May be determined. Note that, in the position of the line of sight of the eye to be inspected, when a range including the above-described predetermined region is provided, the determining unit determines whether at least a part of this range overlaps at least a part of the visual target. Alternatively, it may be determined whether or not the eye to be inspected is gazing at the target.

  The optotype projected on the eye to be inspected may be provided with a permissible range indicating that the eye to be inspected is gazing at the optotype. For example, the allowable range may be set in a predetermined area based on the visual target. As an example, it may be set in a predetermined range based on the center of the optotype. When such a permissible range is provided on the optotype, the determination means determines whether or not the eye to be examined is gazing at the optotype based on whether or not the position of the line of sight of the eye is within the permissible range. May be determined. Note that, in the position of the line of sight of the eye to be inspected, when a range including the above-described predetermined region is provided, the determination unit determines whether at least a part of this range overlaps at least a part of the allowable range. Alternatively, it may be determined whether or not the eye to be inspected is gazing at the target. By setting the allowable range for the optotype presented to the eye to be inspected, the determination criterion becomes clear, and it is more easily determined whether or not the eye to be inspected is gazing at the optotype.

  The determination means may determine whether or not the eye to be inspected is gazing at the optotype by determining whether or not the position of the line of sight of the eye to be inspected is included in the allowable range for a predetermined time or longer. In addition, when a range including a predetermined region is provided at the position of the line of sight of the eye to be inspected, and when an allowable range is provided on the visual target, at least a part of the range provided at the position of the line of sight is It may be determined whether or not the eye to be inspected is gazing at the optotype based on whether or not the permissible range provided for the target is included for a predetermined time or more. This makes it easier to distinguish between the state where the eye to be examined is gazing at the target and the state where the eye is not gazing, and it is possible to easily determine the state where the eye to be examined is gazing at the target. it can. Of course, the determination means determines whether or not the position of the line of sight of the eye to be examined overlaps at least a part of the eye target projected onto the eye to be examined for a predetermined time or more, and the eye to be examined gazes at the eye target. It may be determined whether or not there is.

  The determining means determines whether or not the position of the line of sight of the subject's eye overlaps at least a part of the target projected on the subject's eye a predetermined number of times or more, and the position of the line of sight of the subject's eye is projected on the subject's eye. It may be possible to determine whether or not the eye to be inspected is gazing at the optotype by determining, for example, whether or not it is included within the allowable range of a predetermined number of times or more.

  For example, the permissible range indicating that the target is being gazed may be set to a different range for each target. As an example, for each optotype, based on at least one of the positional relationship between the eye to be inspected and the optotype (for example, inspection distance, etc.), type of optotype, size of optotype, visual acuity value of the optotype, etc. It may be set in different ranges. For example, since various optotypes are presented to the eye to be examined at the time of eye examination, whether or not the eye to be examined is gazing at the optotype by setting an allowable range according to the size of the optotype or the like. More accurately determined.

<Output means>
In the present embodiment, the optometry system includes an output unit (for example, the control unit 70). The output unit outputs the gaze information indicating the gaze state of the eye to be inspected, based on the determination result of the determination unit. The gaze information may be information indicating the position of the line of sight of the eye to be inspected by the detection unit, information indicating the determination result by the determination unit, information indicating the degree to which the eye to be inspected gazes at the target, or the like. The gaze information is at least one of output by display on display means (for example, monitor 4), output by generation of voice guide, output by storage in memory, cloud, server, etc., output by printing on printer, etc. May be output by The examiner can easily determine whether or not the eye to be inspected is gazing at the target by outputting the gaze information. Further, the examiner can give an appropriate instruction to the subject and accurately measure the optical characteristics of the subject's eye.

  In the present embodiment, the optometry system may control the operation of the optometry apparatus based on the gaze information. As an example, the optometry system may switch the target to be presented to the subject's eye based on the gaze information. In this case, control is performed to switch the visual target presented to the eye to be inspected to one lower level of visual acuity, to switch the visual target presented to the eye to one of higher visual acuity value, or to switch the type of visual target. May be performed.

<Display means>
In the present embodiment, the optometry system includes a display unit (for example, the monitor 4) for an examiner. The display means for the examiner may be a display means provided in the optometry apparatus. In addition, the display unit for the examiner uses wired communication (for example, optical fiber, wired LAN, etc.) or wireless communication (for example, Wi-Fi (registered trademark), Bluetooth (registered trademark), etc.) to the optometry device. It may be a connected display means. In this case, a controller, a tablet terminal, or the like may be used as the display means.

  The display unit for the examiner can display at least a part of the visual target projected on the eye to be inspected. For example, the display unit for the examiner may be a display unit capable of displaying at least a part of the visual target projected on the eye to be inspected so that the ratio in the vertical direction and the ratio in the horizontal direction are the same. Of course, for example, the display unit for the examiner may be a display unit capable of displaying at least a part of the visual target projected on the subject's eye so that the vertical direction and the horizontal direction have a predetermined ratio.

  The display unit for the examiner may be a display unit capable of displaying a line-of-sight position mark (for example, the line-of-sight position mark M2) indicating the position of the line of sight of the eye to be inspected. By the display means for the examiner, at least a part of the visual target projected onto the eye to be examined and the line-of-sight position mark are displayed, so that the examiner can see where the examinee is looking at the visual target. It can be visually confirmed and appropriate instructions can be given to the subject.

  The display means for the examiner is a display means capable of displaying an allowable range mark (for example, the allowable range mark M1 and the allowable range mark M4) indicating the allowable range set for the optotype projected on the eye to be examined. May be On the display means for the examiner, at least a part of the visual target projected on the eye to be inspected, the line-of-sight position mark, and the allowable range mark are displayed, so that the examiner is In addition to where the user is looking, it is possible to visually confirm whether the position of the line of sight of the subject is within the allowable range, and it is possible to give an appropriate instruction to the subject.

<Display control means>
In the present embodiment, the optometry system includes display control means (for example, control unit 70). The display control means causes the display means for the examiner to display at least a part of the visual target projected on the eye to be inspected, and also to display a line-of-sight position mark indicating the position of the line of sight of the eye to be inspected. The display control unit may display the line-of-sight position mark on the visual target displayed on the display unit for the examiner based on the position of the visual line on the visual target projected on the eye to be examined. For example, a movement signal for moving the display position of the line-of-sight position mark may be issued every time the line-of-sight position of the eye to be examined changes. The display control means may move the display position of the line-of-sight position mark displayed on the examiner's display means based on such a movement signal. The display control means may control the display of the display means for the examiner so that when the display position of the line-of-sight position mark is moved, the locus of movement of the line-of-sight position mark remains.

  Further, the display control means causes the display means for the examiner to display the allowable range mark indicating the allowable range. The display control means may display the allowable range mark at the display position of the optotype on the examiner's display means based on the display position of the optotype projected on the eye to be examined. For example, a movement signal for moving the display position of the allowable range mark may be issued every time the display position of the optotype projected on the eye to be examined changes. The display control means may move the display position of the allowable range mark displayed on the display means for the examiner based on such a movement signal.

  Further, the display control means may display the allowable range mark of an appropriate size on the optotype on the examiner's display means based on the type of the optotype projected on the eye to be examined. For example, a change signal for changing the size of the permissible range mark may be issued every time the type of the optotype projected on the eye to be examined is switched. The display control means may change the size of the permissible range mark displayed on the display means for the examiner based on such a change signal.

  For example, the optometry system according to the present embodiment, in this way, the display means for the examiner capable of displaying at least a part of the optotype projected on the eye to be examined, and the display means for the examiner, at least the optotype A part of the line of sight is displayed, and a line-of-sight position mark indicating the position of the line of sight and an allowable range mark indicating an allowable range are displayed. This allows the examiner to easily determine where the examinee is looking at the optotype.

<Example>
An example of the optometry system according to this embodiment will be described with reference to the drawings. In the present embodiment, as the optometry system, an anterior segment imaging optical system for acquiring an anterior segment image of the subject's eye, and a subjective measurement optical system for subjectively measuring the optical characteristics of the subject's eye E, An optometry apparatus integrally provided with an objective measurement optical system for objectively measuring the optical characteristics of the eye E is taken as an example.

  FIG. 1 is an external view of the optometry apparatus 1. For example, the optometry apparatus 1 includes a housing 2, a presentation window 3, a monitor 4, a chin rest 5, a base 6, an anterior ocular segment imaging optical system 100, and the like.

  The housing 2 is fixed to the base 6. A measuring unit 7 is provided inside the housing 2 (details will be described later). The presentation window 3 is used to present a target to the eye of the subject (eye E to be examined). The target luminous flux from the measurement unit 7 is projected onto the eye E through the presentation window 3.

  The chin rest 5 is fixed to the base 6. The chin rest 5 is used to keep the distance between the eye E to be inspected and the optometry apparatus 1 constant. It is to be noted that the present invention is not limited to the chin rest 5, and a configuration such as a forehead support, a face support, or the like may be used to keep the distance between the eye E to be inspected and the optometry apparatus 1 constant.

  The monitor 4 displays the measurement result and the like of the optical characteristics of the eye E to be inspected. The monitor 4 is a display having a touch panel function. That is, the monitor 4 functions as an operation unit (controller). The monitor 4 does not have to be a touch panel type, and the monitor 4 and the operation unit may be separately provided. In this case, at least one of a mouse, a joystick, a keyboard, a mobile terminal, etc. may be used as the operation unit. A signal corresponding to the operation instruction input from the monitor 4 is output to the control unit 70 described later.

  The anterior segment imaging optical system 100 is used to capture the face of the subject. The anterior segment imaging optical system 100 is composed of an imaging device and a lens (not shown). The anterior ocular segment imaging optical system 100 images at least one of the left and right eye E to be inspected and acquires the anterior ocular segment image. The anterior ocular segment image acquired by the anterior ocular segment imaging optical system 100 is analyzed by the control unit 70 described later.

<Measurement part>
The measurement unit 7 includes a left-eye measurement unit 7L and a right-eye measurement unit 7R. The measurement unit 7 includes a pair of left and right subjective-type measurement units described below and a pair of left-and-right objective measurement units described below. The left-eye measuring unit 7L and the right-eye measuring unit 7R in the present embodiment are made of the same member. Of course, at least a part of the left-eye measuring unit 7L and the right-eye measuring unit 7R may be configured by different members.

  FIG. 2 is a diagram showing the measuring unit 7. In FIG. 2, the measurement unit 7 is a left-eye measurement unit 7L as an example. The right-eye measurement unit 7R has the same configuration as the left-eye measurement unit 7L, and thus will be omitted. For example, the left-eye measurement unit 7L includes the subjective measurement optical system 25, the objective measurement optical system 10, the first index projection optical system 45, the second index projection optical system 46, the observation optical system 50, and the like.

<Conscious optical system>
The subjective measurement optical system 25 is used as part of the configuration of the subjective measurement unit that subjectively measures the optical characteristics of the eye E (details will be described later). In the present embodiment, as an optical characteristic of the eye E to be examined, the subjective measurement unit for measuring the eye refractive power of the eye E is taken as an example. Note that the optical characteristics of the eye E to be examined may be contrast sensitivity, binocular vision function (for example, amount of oblique position, stereoscopic vision function, etc.), etc., in addition to the eye refractive power. For example, the subjective measurement optical system 25 includes a projection optical system (target projection system) 30, a correction optical system 60, and a correction optical system 90.

  The light projecting optical system 30 projects the target luminous flux toward the eye E to be examined. For example, the projection optical system 30 includes a display 31, a projection lens 40, a projection lens 33, a projection lens 34, a reflection mirror 36, a dichroic mirror 35, a dichroic mirror 29, an objective lens 14, and the like.

  On the display 31, optotypes (fixation target, inspection target, etc.) are displayed. The target light flux emitted from the display 31 is projected on the eye E through the optical members in the order of the light projecting lens 33, the light projecting lens 34, the reflecting mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14. To be done.

  The correction optical system 60 is arranged in the optical path of the projection optical system 30. Further, the correction optical system 60 changes the optical characteristics of the target luminous flux emitted from the display 31. For example, the correction optical system 60 includes an astigmatism correction optical system 63, a drive mechanism 39, and the like.

  The astigmatism correction optical system 63 is arranged between the light projecting lens 33 and the light projecting lens 34. The astigmatism correction optical system 63 is used to correct the cylindrical power and the astigmatic axis angle of the eye E to be inspected. The astigmatism correction optical system 63 is composed of two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lens 61a and the cylindrical lens 61b rotate independently about the optical axis L2 by the driving of the rotating mechanism 62a and the rotating mechanism 62b. In this embodiment, the astigmatism correction optical system 63 has been described by taking the configuration using the cylindrical lens 61a and the cylindrical lens 61b as an example, but the present invention is not limited to this. The astigmatism correction optical system 63 may have a configuration capable of correcting the cylindrical power, the astigmatic axis angle, and the like. For example, in this case, a corrective lens may be taken in and out of the optical path of the projection optical system 30.

  The drive mechanism 39 includes a motor and a slide mechanism. The drive mechanism 39 moves the display unit 31 in the optical axis L2 direction by moving the drive unit 95 described below in the optical axis L2 direction. In the objective measurement, a cloud is applied to the eye E to be inspected by moving the display 31. In the subjective measurement, the display position (presentation distance) of the target with respect to the eye E is optically changed by moving the display 31, and the spherical refractive power of the eye E is corrected. That is, by moving the display 31, a correction optical system for correcting the spherical power is configured. The configuration for correcting the spherical power can be changed. For example, the spherical power may be corrected by disposing a large number of optical elements in the optical path. Further, for example, the spherical power may be corrected by disposing the lens in the optical path and moving the lens in the optical axis direction.

  In this embodiment, a correction optical system for correcting the spherical power, the cylindrical power, and the astigmatic axis angle is illustrated. However, the correction optical system may correct other optical characteristics (eg, prism value, etc.). By correcting the prism value, the target luminous flux is appropriately projected onto the eye even if the eye is an oblique eye.

  Further, in this embodiment, the astigmatism correction optical system 63 for correcting the cylindrical power and the astigmatic axis angle and the drive mechanism 39 for correcting the spherical power are separately provided. However, the spherical power, the cylindrical power, and the astigmatic axis angle may be corrected by the same configuration. For example, an optical system that modulates the wavefront may correct the spherical power, the cylindrical power, and the astigmatic axis angle. Further, a lens disc having a plurality of optical elements (for example, at least one of a spherical lens, a cylindrical lens, and a dispersion prism) arranged on the same circumference, and an actuator for rotating the lens disc are used as a correction optical system. May be In this case, various optical characteristics are corrected by rotating the lens disk and switching the optical elements located on the optical axis L2. Further, an optical element (for example, at least one of a cylindrical lens, a cross cylinder lens, a rotary prism, etc.) arranged on the optical axis L2 may be rotated by the actuator.

  The correction optical system 90 is arranged between the objective lens 14 and the deflection mirror 81 (described later). The correction optical system 90 is used to correct the optical aberration (for example, astigmatism) generated in the subjective measurement. The correction optical system 90 corrects astigmatism by adjusting the cylindrical power and the astigmatic axis angle. The correction optical system 90 is composed of two positive cylindrical lenses 91a and 91b having the same focal length. The cylindrical lens 91a and the cylindrical lens 91b rotate independently about the optical axis L3 by driving the rotating mechanism 92a and the rotating mechanism 92b. In this embodiment, the correction optical system 90 has been described by taking as an example a configuration in which two positive cylindrical lenses 91a and 91b are used, but the present invention is not limited to this. The correction optical system 90 may have any configuration capable of correcting astigmatism. For example, in this case, a correction lens may be taken in and out from the optical axis L3.

<Objective optical system>
The objective measurement optical system 10 is used as a part of the configuration of the objective measurement unit that objectively measures the optical characteristics of the subject's eye (details will be described later). In this embodiment, as an optical characteristic of the eye E to be examined, an objective measuring section for measuring the eye refractive power of the eye E will be described as an example. The optical characteristics of the eye E to be examined may be the axial length of the eye, the shape of the cornea, and the like, in addition to the refractive power of the eye. For example, the objective measurement optical system 10 includes a projection optical system 10a, a light receiving optical system 10b, and a correction optical system 90.

  The projection optical system (projection optical system) 10a projects a spot-shaped measurement index on the fundus of the eye E to be examined through the central part of the pupil of the eye E to be examined. For example, the projection optical system 10a includes a light source 11, a relay lens 12, a hole mirror 13, a prism 15, a dichroic mirror 35, a dichroic mirror 29, an objective lens 14, and the like.

  The light source 11 emits a measurement light beam. The light source 11 has a conjugate relationship with the fundus of the eye E to be examined. The hole portion of the hole mirror 13 has a conjugate relationship with the pupil of the eye E to be inspected. The prism 15 is a light beam deflecting member. The prism 15 is arranged at a position deviated from a position conjugate with the pupil of the eye E to be examined, and decenters the measurement light flux passing through the prism 15 with respect to the optical axis L1. The prism 15 is rotationally driven by a drive unit (motor) 23 about the optical axis L1. The dichroic mirror 35 shares the optical path of the objective measuring optical system 10 and the optical path of the subjective measuring optical system 25 described later. That is, the dichroic mirror 35 makes the optical axis L1 of the objective measuring optical system 10 and the optical axis L2 of the subjective measuring optical system 25 coaxial. The dichroic mirror 29 is an optical path branching member. The dichroic mirror 29 reflects the measurement light beam from the projection optical system 10a and the measurement light beam from the subjective measurement optical system 25 and guides it to the subject's eye E.

  The light receiving optical system 10b takes out the fundus reflected light flux reflected by the fundus of the eye E to be examined in a ring shape via the peripheral portion of the pupil of the eye E to be examined. For example, the light receiving optical system 10b includes an objective lens 14, a dichroic mirror 29, a dichroic mirror 35, a prism 15, a hole mirror 13, a relay lens 16, a mirror 17, a light receiving diaphragm 18, a collimator lens 19, a ring lens 20, an image sensor 22, And so on. The ring lens 20 is composed of a lens portion formed in a ring shape and a light shielding portion in which a region other than the lens portion is coated with a light shielding material. The ring lens 20 has an optically conjugate positional relationship with the pupil of the eye E to be inspected. The light receiving diaphragm 18 and the image sensor 22 have a conjugate relationship with the fundus of the eye E to be examined. The output from the image sensor 22 is input to the control unit 70.

  In the present embodiment, the light source 11 included in the projection optical system 10a, the light receiving diaphragm 18, the collimator lens 19, the ring lens 20, and the image pickup element 22 included in the light receiving optical system 10b, and the display 31 included in the light projecting optical system 30, Can be integrally moved in the optical axis direction by a drive mechanism 39. That is, the light source 11, the light receiving diaphragm 18, the collimator lens 19, the ring lens 20, the image pickup device 22, and the display 31 are synchronized as the drive unit 95, and the drive mechanism 39 integrally moves them. For example, the movement position of the drive mechanism 39 is detected by a potentiometer (not shown).

  The drive unit 95 moves a part of the objective measurement optical system 10 in the optical axis direction so that the outer ring light flux enters the image sensor 22 in each meridian direction. That is, by moving a part of the objective measurement optical system 10 in the optical axis L1 direction according to the spherical refraction error (spherical refractive power) of the eye E, the spherical refraction error is corrected and the fundus of the eye E to be inspected. On the other hand, the light source 11, the light receiving diaphragm 18, and the image pickup device 22 are optically conjugated. The hole mirror 13 and the ring lens 20 are arranged so as to be conjugate with the pupil of the eye E to be examined at a constant magnification regardless of the amount of movement of the drive unit 95.

  In the above configuration, the measurement light beam emitted from the light source 11 passes through the relay lens 12, the hole mirror 13, the prism 15, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14, and is spotted on the fundus of the eye E to be inspected. Form a point source image. At this time, the pupil projection image (projected light flux on the pupil) of the hole portion in the hole mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis. The point light source image projected on the fundus is reflected / scattered, emerges from the eye E to be inspected, and is condensed by the objective lens 14 to be condensed by the dichroic mirror 29, dichroic mirror 35, high-speed rotating prism 15, hole mirror 13, relay lens. 16, the light is condensed again at the position of the light receiving diaphragm 18 via the mirror 17, and the collimator lens 19 and the ring lens 20 form a ring-shaped image on the image pickup element 22.

  For example, the prism 15 is arranged in the common optical path of the projection optical system 10a and the light receiving optical system 10b. For example, since the reflected light flux from the fundus passes through the same prism 15 as the projection optical system 10a, the subsequent optical systems perform reverse scanning as if the projection light flux / reflected light flux (reception light flux) was not decentered on the pupil. To be done.

  In addition, in the present embodiment, the configuration of the objective measuring unit can be changed. For example, the objective measurement unit has a configuration in which a ring-shaped measurement index is projected from the peripheral part of the pupil to the fundus, fundus reflected light is extracted from the center of the pupil, and the image sensor 22 receives a ring-shaped fundus reflected image. May be. Further, the objective measuring unit may be provided with a Shack-Hartmann sensor, or may be provided with a phase difference type configuration for projecting a slit.

<First index projection optical system and second index projection optical system>
For example, in this embodiment, the first index projection optical system 45 and the second index projection optical system 46 are arranged between the correction optical system 90 and the deflection mirror 81. Of course, the arrangement positions of the first index projection optical system 45 and the second index projection optical system 46 are not limited to this. For example, the first index projection optical system 45 and the second index projection optical system 46 may be included in the cover of the housing 2. For example, in this case, the first index projection optical system 45 and the second index projection optical system 46 may be arranged around the presentation window 3.

  For example, the first index projection optical system 45 includes a ring-shaped infrared light source arranged around the optical axis L3. For example, the first index projection optical system 45 emits near-infrared light for projecting the alignment index on the cornea of the eye E to be inspected. For example, the second index projection optical system 46 includes a ring-shaped infrared light source arranged at a position different from that of the first index projection optical system 45. Note that in FIG. 2, for convenience, only a part (cross-sectional portion) of the ring-shaped infrared light source in the first index projection optical system 45 and the second index projection optical system 46 is shown. In this embodiment, the first index projection optical system 45 projects an alignment index at infinity onto the cornea of the subject's eye. Further, the second index projection optical system 46 projects an alignment index at a finite distance onto the cornea of the subject's eye. The alignment light emitted from the second index projection optical system 46 is also used as anterior segment imaging light for capturing the anterior segment of the eye by the observation optical system 50. Further, the light sources of the first index projection optical system 45 and the second index projection optical system 46 are not limited to the ring-shaped light source, and may be a plurality of point-shaped light sources or line-shaped light sources.

<Observation optical system>
The observation optical system (imaging optical system) 50 includes the objective lens 14, a dichroic mirror 29, an imaging lens 51, an imaging element 52, and the like. The dichroic mirror 29 transmits the anterior ocular segment observation light and the alignment light. The 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. The output from the image sensor 52 is input to the control unit 70. As a result, the anterior segment image of the eye E is captured by the image sensor 52 and displayed on the monitor 4. The observation optical system 50 also functions as an optical system that detects the alignment index image formed on the cornea of the eye E by the first index projection optical system 45 and the second index projection optical system 46, and is controlled by the control unit 70. The position of the alignment index image is detected.

<Internal configuration of optometry device>
The internal configuration of the optometry apparatus 1 will be described below. FIG. 3 is a schematic configuration diagram of the inside of the optometry apparatus 1 according to the present embodiment as viewed from the front direction (direction A in FIG. 1). FIG. 4 is a schematic configuration diagram of the inside of the optometry apparatus 1 according to the present embodiment as viewed from the side direction (direction B in FIG. 1). FIG. 5 is a schematic configuration diagram of the inside of the optometry apparatus 1 according to the present embodiment as viewed from the top surface direction (direction C in FIG. 1). 4 and 5, for convenience of explanation, only the optical axis of the left-eye measuring unit 7L is shown.

  For example, the optometry apparatus 1 includes a subjective measurement unit and an objective measurement unit. For example, in the subjective-type measuring section and the objective-type measuring section, the target luminous flux from the measuring section 7 passes through an optical path that coincides with the optical axis L of an optical member (for example, a concave mirror 85 described later), and the eye E to be inspected. May be guided to. Further, for example, in the subjective measuring unit and the objective measuring unit, the target luminous flux from the measuring unit 7 passes through an optical path deviated from the optical axis L of an optical member (for example, a concave mirror 85 described later) and is detected. The light may be guided to the optometry E. For example, in this embodiment, the optical axis L is an axis toward the spherical center of the concave mirror 85. In the following, a configuration in which the target luminous flux from the measurement unit 7 passes through a path deviated from the optical axis L of the concave mirror 85 will be described as an example. That is, the target light flux from the measurement unit 7 is emitted obliquely to the optical axis L of the concave mirror 85, and the reflected light flux is guided to the eye E to be inspected.

  For example, the subjective measurement unit includes the measurement unit 7, the deflection mirror 81, the drive mechanism 82, the drive unit 83, the reflection mirror 84, and the concave mirror 85. The subjective measurement unit is not limited to this configuration. For example, the structure without the reflection mirror 84 may be used. In this case, the visual target light flux from the measurement unit 7 may be emitted from the oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Further, for example, a configuration having a half mirror may be used. In this case, the target light flux from the measurement unit 7 may be emitted obliquely to the optical axis L of the concave mirror 85 via the half mirror, and the reflected light flux may be guided to the eye E to be examined. .. Although the concave mirror 85 is arranged in the present embodiment, the convex mirror 85 may be arranged instead of the concave mirror 85.

  For example, the objective measurement unit includes the measurement unit 7, the deflection mirror 81, the reflection mirror 84, and the concave mirror 85. The objective measuring unit is not limited to this configuration. For example, the structure without the reflection mirror 84 may be used. In this case, the visual target light flux from the measurement unit 7 may be emitted from the oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Further, for example, a configuration having a half mirror may be used. In this case, the target light flux from the measurement unit 7 may be emitted obliquely to the optical axis L of the concave mirror 85 via the half mirror, and the reflected light flux may be guided to the eye E to be examined. .. Although the concave mirror 85 is arranged in this embodiment, the convex mirror 85 may be arranged instead of the concave mirror 85.

  For example, the optometry apparatus 1 has a left-eye drive unit 9L and a right-eye drive unit 9R, and can move the left-eye measurement unit 7L and the right-eye measurement unit 7R in the X direction. For example, by moving the left-eye measuring unit 7L and the right-eye measuring unit 7R, the distance between the deflection mirror 81 and the measuring unit 7 is changed, and the presentation position of the target luminous flux in the Z direction is changed. It As a result, the optotype light flux corrected by the correction optical system 60 is guided to the eye E, and an image of the optotype light flux corrected by the correction optical system 60 is formed on the fundus of the eye E to be measured. The part 7 can be adjusted in the Z direction.

  For example, the deflection mirror 81 includes a right-eye deflection mirror 81R and a left-eye deflection mirror 81L that are provided in a pair of left and right. For example, the deflection mirror 81 is arranged between the correction optical system 60 and the eye E to be inspected. That is, the correction optical system 60 in the present embodiment has a left-eye correction optical system and a right-eye correction optical system that are provided in a left-right pair, and the left-eye deflection mirror 81L is the left-eye correction optical system. The deflection mirror 81R for the right eye is disposed between the optical system and the left eye EL to be inspected, and is disposed between the correction optical system for the right eye and the right eye ER. For example, the deflection mirror 81 is preferably arranged at the conjugate position of the pupil.

  For example, the left-eye deflection mirror 81L reflects the light beam projected from the left-eye measurement unit 7L and guides it to the left eye EL to be inspected. Further, for example, the left-eye deflection mirror 81L reflects the reflected light reflected by the left eye EL to be guided to the left-eye measurement unit 7L. For example, the right-eye deflection mirror 81R reflects the light beam projected from the right-eye measurement unit 7R and guides it to the right eye ER. Further, for example, the right-eye deflection mirror 81R reflects the reflected light reflected by the right eye ER and guides it to the right-eye measurement unit 7R. In the present embodiment, the configuration in which the deflecting mirror 81 is used as the deflecting member that reflects the light beam projected from the measuring unit 7 and guides it to the subject's eye E has been described as an example, but is not limited thereto. Not done. The deflecting member may be a deflecting member that reflects the light beam projected from the measurement unit 7 and guides it to the eye E. For example, examples of the deflecting member include a prism and a lens.

  For example, the drive mechanism 82 includes a motor (drive unit) and the like. For example, the drive mechanism 82 includes a drive mechanism 82L for driving the left-eye deflection mirror 81L and a drive mechanism 82R for driving the right-eye deflection mirror 81R. For example, the driving of the drive mechanism 82 causes the deflection mirror 81 to rotate. For example, the drive mechanism 82 rotates the deflection mirror 81 about a rotation axis in the horizontal direction (X direction) and a rotation axis in the vertical direction (Y direction). That is, the drive mechanism 82 rotates the deflection mirror 81 in the XY directions. The deflection mirror 81 may be rotated in either the horizontal direction or the vertical direction.

  For example, the drive unit 83 includes a motor or the like. For example, the drive unit 83 includes a drive unit 83L for driving the left-eye deflection mirror 81L and a drive unit 83R for driving the right-eye deflection mirror 81R. For example, the deflection mirror 81 is moved in the X direction by driving the driving unit 83. For example, by moving the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye, the distance between the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye is changed, and the eye to be inspected. The distance in the X direction between the optical path for the left eye and the optical path for the right eye can be changed according to the interpupillary distance of E.

  Note that, for example, a plurality of deflection mirrors 81 may be provided in each of the left-eye optical path and the right-eye optical path. For example, there is a configuration in which two deflection mirrors are provided in each of the left-eye optical path and the right-eye optical path (for example, two deflection mirrors in the left-eye optical path). In this case, one deflection mirror may be rotated in the X direction and the other deflection mirror may be rotated in the Y direction. For example, the image forming position can be optically corrected by rotating the deflection mirror 81 to deflect an apparent light beam for forming the image of the correction optical system 60 in front of the eye to be inspected. it can.

  For example, the concave mirror 85 is shared by the right-eye measuring unit 7R and the left-eye measuring unit 7L. For example, the concave mirror 85 is shared by the optical path for the right eye including the correction optical system for the right eye and the optical path for the left eye including the correction optical system for the left eye. That is, the concave mirror 85 is arranged at a position that passes through both the right-eye optical path including the right-eye correction optical system and the left-eye optical path including the left-eye correction optical system. Of course, the concave mirror 85 may not be configured to be shared by the right-eye optical path and the left-eye optical path. That is, a concave mirror may be provided in each of the right-eye optical path including the right-eye correction optical system and the left-eye optical path including the left-eye correction optical system. For example, the concave mirror 85 guides the target luminous flux that has passed through the correction optical system to the eye E, and forms an image of the target luminous flux that has passed through the correction optical system in front of the eye E. In the present embodiment, the configuration using the concave mirror 85 has been described as an example, but the present invention is not limited to this, and various optical members can be used. For example, a lens, a plane mirror, or the like can be used as the optical member.

  For example, the concave mirror 85 is used as both the subjective measuring unit and the objective measuring unit. For example, the target luminous flux projected from the subjective measurement optical system 25 is projected onto the eye E through the concave mirror 85. For example, the measurement light projected from the objective measurement optical system 10 is projected onto the eye E through the concave mirror 85. Further, for example, the reflected light of the measurement light projected from the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85. In the present embodiment, the configuration is such that the reflected light of the measurement light from the objective measurement optical system 10 is guided to the light receiving optical system 10b of the objective measurement optical system 10 via the concave mirror 85. However, it is not limited to this. For example, the reflected light of the measurement light from the objective measurement optical system 10 may be configured not to pass through the concave mirror 85.

  More specifically, for example, in the present embodiment, the optical axis between the concave mirror 85 in the subjective measurement unit and the eye E and the optical axis between the concave mirror 85 in the objective measurement unit and the eye E are measured. The optical axis and the optical axis are at least coaxial. For example, in this embodiment, the dichroic mirror 35 combines the optical axis L2 of the subjective measuring optical system 25 and the optical axis L1 of the objective measuring optical system 10 to form a coaxial line.

<Optical path of subjective measurement unit>
The optical path of the subjective measuring unit will be described below. For example, the subjective measurement unit guides the target light flux that has passed through the correction optical system 60 to the eye to be inspected E by reflecting the target light flux in the direction of the eye by the concave mirror 85, and passes through the correction optical system 60. An image of the target luminous flux is formed in front of the eye E to be inspected so as to optically provide a predetermined inspection distance. For example, at this time, the target light flux that has passed through the correction optical system 60 passes through the optical path off the optical axis L of the concave mirror 85 and enters the concave mirror 85, and the optical path off the optical axis L of the concave mirror 85. Is reflected so as to pass through and is guided to the eye E to be inspected. For example, the inspection target viewed from the subject seems to be farther than the actual distance from the eye E to the display 31. That is, by using the concave mirror 85, the presenting distance of the examination target to the subject's eye E is extended, and the examination target is presented to the subject so that the image of the target luminous flux can be seen at the position of the predetermined examination distance. be able to.

  This will be described in more detail. In the following description, the optical path for the left eye will be described as an example, but the optical path for the right eye has the same configuration as the optical path for the left eye. For example, in the subjective measurement unit for the left eye, the target luminous flux projected from the display 31 of the measurement unit 7L for the left eye enters the astigmatism correction optical system 63 via the light projecting lens 33. The target light flux that has passed through the astigmatism correction optical system 63 enters the correction optical system 90 via the reflection mirror 36, the dichroic mirror 35, the dichroic mirror 29, and the objective lens 14. The target luminous flux that has passed through the correction optical system 90 is guided from the left-eye measurement unit 7L toward the left-eye deflection mirror 81L. The target light flux emitted from the left-eye measurement unit 7L and reflected by the left-eye deflection mirror 81 is reflected by the reflection mirror 84 toward the concave mirror 85. For example, the target luminous flux emitted from the display 31 reaches the left eye EL by passing through the optical member in this way.

  As a result, the test target corrected by the correction optical system 60 is formed on the fundus of the left eye to be examined EL with the eyeglass wearing position of the left eye to be examined EL (for example, about 12 mm from the corneal vertex position) as a reference. Therefore, that the astigmatism correction optical system 63 is arranged in front of the eye, and that the spherical power is adjusted in front of the eye by the correction optical system of the spherical power (in this embodiment, the drive mechanism 39 is driven). Are equivalent to each other, and the subject can collimate the image of the examination target in a natural state via the concave mirror 85. In the present embodiment, the optical path for the right eye has the same configuration as the optical path for the left eye, and the spectacle wearing positions of the left eye EL and the right eye ER (for example, about 12 mm from the corneal apex position) are set. As a reference, a test target corrected by the pair of right and left correction optical systems 60 is formed on the fundus of both eyes. In this way, the subject responds to the examiner while looking directly at the examination target in the state of natural vision, corrects the correction optical system 60 until the inspection target looks appropriate, and based on the correction value. And subjectively measure the optical characteristics of the subject's eye.

<Optical path of objective measuring unit>
Next, the optical path of the objective measuring unit will be described. In the following description, the optical path for the left eye will be described as an example, but the optical path for the right eye has the same configuration as the optical path for the left eye. For example, in the objective measurement unit for the left eye, the measurement light emitted from the light source 11 of the projection optical system 10a in the objective measurement optical system 10 passes through the relay lens 12 to the objective lens 14 to correct the correction optical system 90. Incident on. The measurement light that has passed through the correction optical system 90 is projected from the left-eye measurement unit 7L toward the left-eye deflection mirror 81L. The measurement light emitted from the left-eye measurement unit 7L and reflected by the left-eye deflection mirror 81 is reflected by the reflection mirror 84 toward the concave mirror 85. The measurement light reflected by the concave mirror passes through the reflection mirror 84 and reaches the left eye EL to be inspected, and forms a spot-shaped point light source image on the fundus of the left eye EL to be inspected. At this time, the pupil projection image (projected light flux on the pupil) of the hole portion of the hall mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis.

  The light of the point light source image formed on the fundus of the left eye EL to be inspected is reflected / scattered, exits the eye E to be inspected, is condensed by the objective lens 14 via the optical path through which the measurement light has passed, and is dichroic mirror. 29, dichroic mirror 35, prism 15, hole mirror 13, relay lens 16, and mirror 17. The reflected light that has passed through the mirror 17 is condensed again on the aperture of the light receiving diaphragm 18, converted into a substantially parallel light beam (in the case of an emmetropic eye) by the collimator lens 19, and extracted as a ring-shaped light beam by the ring lens 20. The light is received by the image sensor 22 as a ring image. By analyzing the received ring image, the optical characteristics of the eye E can be objectively measured.

<Control part>
FIG. 6 is a diagram showing a control system of the optometry apparatus 1 according to this embodiment. For example, the control unit 70 is electrically connected to various members such as the monitor 4, the nonvolatile memory 75 (hereinafter, memory 75), the light source 11 included in the measuring unit 7, the image pickup device 22, the display 31, the image pickup device 52, and the like. ing. Further, for example, the control unit 70 is electrically connected to a drive unit (not shown) included in the drive unit 9, the drive mechanism 39, the rotation mechanisms 62a and 62b, the drive unit 83, and the rotation mechanisms 92a and 92b.

  For example, the control unit 70 includes a CPU (processor), a RAM, a ROM, and the like. For example, the CPU controls each member in the optometry apparatus 1. For example, the RAM temporarily stores various information. For example, the ROM stores various programs for controlling the operation of the optometry apparatus 1, examination target data for various examinations, initial values, and the like. The control unit 70 may be composed of a plurality of control units (that is, a plurality of processors).

  For example, the memory 75 is a non-transitory storage medium that can retain stored contents even when power supply is cut off. For example, a hard disk drive, a flash ROM, a USB memory, or the like can be used as the memory 75. For example, the memory 75 stores a control program for controlling the subjective measuring unit and the objective measuring unit.

<Control operation>
The control operation of the optometry apparatus 1 will be described.

  In the present embodiment, a case will be exemplified in which the optometry apparatus 1 is used to measure the optical characteristics of the eye E to be inspected at a distance. Of course, the optometry apparatus 1 may be used to measure the optical characteristics of the eye E to be inspected during near use.

  The examiner instructs the subject to place his / her chin on the chin rest 5 and observe the presentation window 3. On the eye E to be examined, an optotype (that is, a fixation target) for fixing the eye E to be examined displayed on the display 31 is projected.

  The control unit 70 projects an alignment index image by the first index projection optical system 45 and the second index projection optical system 46 onto the cornea of the eye E to be inspected, and uses the alignment index image to detect the eye E to be measured and the measurement unit 7. Are automatically aligned (for details, refer to, for example, JP-A-2017-86652). The examiner performs objective measurement and subjective measurement on the eye E in a state where the alignment between the eye E and the measurement unit 7 is completed.

  Here, the target is presented to the eye E in both the objective measurement and the subjective measurement, but if the eye E is not gazing at the target, the optical characteristics of the eye E can be accurately measured. I can't measure it well. Even when the eye E is gazing at the target, for example, when gazing at the end of the target, the eyeball is in a state of turning around the turning point, and therefore the optical characteristics of the eye E are examined. May not be accurately measured. Therefore, in this embodiment, in each of the objective measurement and the subjective measurement, it is determined whether or not the eye E is gazing at the target, and the eye E is gazing at the target. , The optical characteristics of the eye E to be examined are appropriately measured.

<Objective measurement>
The examiner causes the subject to observe the fixation target displayed on the display 31 through the presentation window 3. As the fixation target, a target indicating a landscape, a character string, a symbol, a pattern, or the like may be used. In this embodiment, an optotype indicating a point (that is, a point image optotype) is displayed as the fixation target.

  First, preliminary measurement of the objective value is performed on the eye E to be examined. The control unit 70 may move the display 31 in the direction of the optical axis L2 according to the result of the preliminary measurement, and may fog the eye E to be inspected. That is, the control unit 70 temporarily moves the display 31 to a position where the eye E to be in focus and then moves the display 31 to a position where the amount of fog is appropriate, so that the eye E to be inspected may be fogged. Good. For details on the calculation of the amount of fog, refer to, for example, JP-A-2017-99640. This allows the subject to cloud the left eye while observing the fixation target only with the left eye, or to cloud the right eye with the right eye only observing the fixation target. You can It is also possible to apply a cloud to both eyes while the subject is observing the fixation target with both eyes.

  Then, the main measurement of the objective value is performed on the eye E to be inspected. At this time, a measurement light beam is emitted from the infrared light source included in the first index projection optical system 45 and the second index projection optical system 46 toward the cornea of the eye E, and the corneal reflected light beam reflected by the cornea is A bright spot image is captured by an image sensor (not shown) included in the anterior segment imaging optical system 100. In the present embodiment, the position of the line of sight of the eye E under which the fixation target is observed is detected using this bright spot image.

  Further, at this time, the measurement light flux is emitted from the light source 11 toward the fundus of the eye E to be inspected, and the fundus reflected light flux reflected by the fundus is captured by the image sensor 22 as a ring image. In the present embodiment, the optical characteristic in the objective measurement of the eye E to be examined (that is, the objective value of the eye E to be examined) is calculated based on the ring image.

  FIG. 7 is a diagram showing a fixation target observed by the subject and a monitor observed by the examiner. FIG. 7A shows the screen of the display 31. In this embodiment, the fixation target (point image target) 110 is displayed. FIG. 7B shows the screen of the monitor 4. In this embodiment, an anterior ocular segment observation image 120 of the eye E, a fixation target image 130 that is the same as the fixation target 110 observed by the eye E, a measurement result 140 of the main measurement, and the like are displayed.

  The fixation target 110 is set with a permissible range 112 indicating that the eye E is gazing at the fixation target 110. The allowable range 112 is set in a predetermined area with the center of the fixation target 110 as a reference. The size and shape of the allowable range 112 may be set for each type of the fixation target 110 based on the results of experiments and simulations performed in advance. Of course, the examiner may arbitrarily set the size and shape of the allowable range 112.

  In the anterior ocular segment observation image 120, the eye E and the bright spot image 125 formed on the cornea of the eye E are reflected. The bright spot image 125 includes a ring index image R1 and a ring index image R2. The ring index image R1 appears by the infrared light source of the first index projection optical system 45. The ring index image R2 appears by the infrared light source of the second index projection optical system 46.

  The control unit 70 analyzes the anterior segment observation image 120 to detect the position of the pupil of the eye E and the position of the bright spot image 125. The control unit 70 may detect the pupil from the rise or fall of the brightness and further detect the pupil center P by calculating the center of the pupil. The control unit 70 may detect the corneal apex K by detecting the bright spot image 125 from the rise and fall of the brightness and calculating the center of the ring index image R2. Of course, the control unit 70 may detect the corneal vertex K from the ring index image R1. In addition, in the present embodiment, the first index projection optical system 45 and the second index projection optical system 46 are provided with a ring-shaped infrared light source. The corneal apex K is detected by obtaining the position of the center of the index image of.

  Subsequently, the control unit 70 identifies the direction of the line of sight of the eye E from the direction in which the corneal vertex K is displaced from the pupil center P and the displacement amount Δd of the corneal vertex K from the pupil center P. The larger the deviation of the eye position of the eye to be inspected with respect to the optical axis L3 of the observation optical system 50, the larger the deviation amount Δd tends to become. Therefore, by calculating the shift amount Δd, the direction of the line of sight of the eye E to be examined is appropriately specified. The control unit 70 detects the position of the line of sight of the eye E to be gazed at the display 31 based on the direction of the line of sight of the eye E and the distance from the eye E to the display 31 (that is, the inspection distance). be able to.

  In the fixation target image 130, the fixation target 130 for the examiner and the fixation target 110 having the same vertical and horizontal ratios as the fixation target 110 for the subject displayed on the display 31 are set. The allowable range mark M1 indicating the allowable range 112, the line-of-sight position mark M2 indicating the position of the line of sight of the eye E, and the like are displayed. The examiner can visually confirm the following determination by the control unit 70 by superimposing and displaying the allowable range mark M1 and the line-of-sight position mark M2 on the fixation target 130 for the examiner.

  The control unit 70 determines whether the eye E to be examined is gazing at the fixation target 110. For example, by determining whether or not the position of the line of sight of the eye E to be examined is within the allowable range 112, it may be determined whether or not the eye E to be examined is gazing at the fixation target 110. In this embodiment, the eye E to be examined E is fixed by determining whether or not the position of the line of sight of the eye E to be examined is included in the allowable range 112 for a predetermined time or more (for example, 3 seconds or more). It may be determined whether or not the user is gazing at. That is, even if it is determined whether or not the eye E is gazing at the fixation target 110 by determining whether or not the position of the line of sight of the eye E to be examined is within the allowable range for a predetermined time or more. Good. The predetermined time may be set in advance by experiments or simulations.

  The control unit 70 determines that the eye E is not gazing at the fixation target 110 when the position of the line of sight of the eye E is not included in the allowable range 112 for a predetermined time or longer. The control unit 70 also outputs the gaze information for indicating whether or not the eye E is gazing at the fixation target 110 based on the determination result. For example, in the present embodiment, a message M3 indicating that the eye E to be examined is not gazing at the fixation target 110 is displayed on the monitor 4. By the message M3 being displayed, the examiner can give an appropriate instruction such as urging the examinee to gaze so that the examinee looks at the center of the fixation target 110.

  For example, when the position of the line of sight of the subject's eye E moves according to an instruction from the examiner, the line-of-sight position mark M2 displayed in the fixation target image 130 of the monitor 4 moves accordingly. The examiner can confirm whether the instruction has been transmitted to the subject, whether the position of the line of sight has been moved, and the like.

  The control unit 70 determines that the eye E is gazing at the fixation target 110 when the position of the line of sight of the eye E is within the allowable range 112 for a predetermined time or longer. Based on this determination result, the control unit 70 may display a message indicating that the eye E is gazing at the fixation target 110 as the gaze information on the monitor 4. In addition, the control unit 70, on the basis of the gaze information, as an operation signal for starting the main measurement of the objective value, captures a ring image of the measurement light beam emitted from the light source 11 toward the eye E to be inspected on the image sensor 22. An operation signal for (capture) may be output. The ring image captured based on such an operation signal is stored in the memory 75.

  The control unit 70 analyzes the ring image to obtain the eye refractive power in each meridian direction, and performs a predetermined process on the eye refractive power to obtain the objective value of the eye E (that is, the eye E to be examined). Optical characteristics in objective measurement) are acquired as the measurement result of the main measurement. Further, the control unit 70 displays the measurement result 140 of the main measurement on the monitor 4 and stores the measurement result 140 in the memory 75.

<Conscious measurement>
After completing the objective measurement, the examiner operates the monitor 4 to perform the subjective measurement. The control unit 70 controls at least one of the correction optical system 60 and the projection optical system 30 based on the objective value of the eye E to correct the eye refractive power of the eye E to 0D. For example, the control unit 70 may correct the spherical power of the eye E by moving the display 31 in the optical axis L2 direction. In addition, for example, the control unit 70 may correct at least one of the cylindrical power and the astigmatic axis angle of the eye E by rotating the cylindrical lenses 61a and 61b about the optical axis L2. Thereby, the correction dioptric power at which the eye refractive power of the eye E to be examined becomes 0D is acquired. The control unit 70 controls at least one of the correction optical system 60 and the projection optical system 30 so as to correct the eye refractive power of the eye E to a value different from 0D (for example, -1D). You may.

  Further, the control unit 70 switches the display of the display 31 to an optotype (that is, an inspection optotype) for measuring the eye refractive power of the eye E to be inspected, and projects the inspection optotype on the eye E to be inspected. As the inspection target, a target indicating a Landolt ring, E chart, hiragana, katakana, or the like may be used. In this embodiment, a Landolt ring target is displayed as the inspection target. For example, a plurality of Landolt ring targets having different visual acuity values may be displayed.

  FIG. 8 is a diagram showing an examination target observed by the subject and a monitor observed by the examiner. FIG. 8A shows the screen of the display 31. In this embodiment, a plurality of examination optotypes (Landolt ring optotypes) 150 are displayed. FIG. 8B shows the screen of the monitor 4. In the present embodiment, the anterior ocular segment observation image 120 of the eye E to be examined, the examination target image 160 which is the same as the examination target 150 observed by the subject eye E, the measurement result 170 of the subjective measurement, and the like are displayed.

  Similar to the fixation target 110, the inspection target 150 has an allowable range 152 that indicates that the eye E is gazing at the inspection target 150. The size and shape of the permissible range 152 may be set for each inspection target based on the results of experiments and simulations performed in advance. Of course, the examiner may arbitrarily set the size and shape of the permissible range 152. For example, in the present embodiment, a different allowable range 152 is set for each visual acuity value of the examination target 150.

  The inspection target image 160 is set as the inspection target 165 for the examiner and the inspection target 150 having the same ratio in the vertical direction and the horizontal direction as the inspection target 150 for the subject displayed on the display 31. An allowable range mark M4 indicating the allowable range 152 and a line-of-sight position mark M2 indicating the position of the line of sight of the eye E are displayed.

  The examiner operates the monitor 4 to arbitrarily select the examination target 165 for the examiner, thereby setting the allowable range in the examination target 150 for the subject corresponding to the examination target 165. For example, in this embodiment, the examiner selects the examination index 165a in the center column of the second row from the top among the examination indices 165 for the examiner. The control unit 70 sets an allowable range for the test target 150a in the second row from the top among the test targets 150 for the subject according to the operation signal input from the monitor 4. To do. That is, the allowable range is set to the test target 150a for the examinee to which the test target 165a for the examiner corresponds. Further, the control unit 70 superimposes and displays the allowable range mark M4 indicating the allowable range 152 set on the examiner's examination target 150a on the examiner's examination target 165a.

  In such a state, the examiner causes the subject to observe the examination target 150a displayed on the display 31 through the presentation window 3. As described above, the control unit 70 analyzes the anterior ocular segment observation image 300 and determines the position of the line of sight of the eye E to be gazed at the display 31 from the position of the pupil of the eye E and the position of the bright spot image 310. To detect. In addition, as described above, the control unit 70 determines whether or not the position of the line of sight of the eye E to be inspected is included in the allowable range 152 for a predetermined time or more (for example, 3 seconds or more). It is determined whether the optometry E is gazing at the examination target 150a.

  The control unit 70 determines that the eye E is not gazing at the examination target 150a when the position of the line of sight of the eye E is not included in the allowable range 152 for a predetermined time or longer. The control unit 70 also outputs the gaze information for indicating whether or not the eye E is gazing at the examination target 150a based on the determination result. For example, in the present embodiment, a message indicating that the eye E to be inspected is not gazing at the inspection target 150a is displayed on the monitor 4. By displaying the message, the inspector can easily make a determination such as switching the inspection target 150a.

  The control unit 70 may output an operation signal for switching the inspection target 150a based on the gaze information. For example, an operation signal for switching the inspection target 150a to one having a lower visual acuity value may be output, or an operation signal for switching the inspection target 150a to one having a higher visual acuity value may be output. In the present embodiment, an operation signal for switching the inspection visual target 150a to a visual acuity value one step lower is output. The control unit 70 may switch the inspection target 150a displayed on the display 31 based on such an operation signal.

  Further, when the position of the line of sight of the eye E to be inspected is within the allowable range 152 for a predetermined time or longer, the control unit 70 determines that the eye E to be inspected is gazing at the examination target 150a. Based on the determination result, the control unit 70 may display a message M5 indicating that the eye E is gazing at the examination target 150a as the gaze information on the monitor 4. Further, the control unit 70 may output an operation signal for switching the inspection target 150a based on the gaze information. In this embodiment, an operation signal for switching the inspection target 150a to one having a visual acuity value one step higher is output. The control unit 70 may switch the inspection target 150a displayed on the display 31 based on such an operation signal.

  The examiner asks the subject about the orientation of the examination target 150 (the orientation of the Landolt ring target gap), and corrects the subject's eye E by taking into account the subject's response and the position of the line of sight. It is confirmed whether or not the power (correction power for correcting the eye refractive power of the eye E to be inspected to 0D in this embodiment) is appropriate. If the correction power is inappropriate, the correction optical system 60 and the projection optical system 30 are controlled to correct the eye refracting power of the eye E with a predetermined diopter value, and the correction power is corrected again. May be confirmed to be appropriate. The control unit 70 acquires the correction power determined to be appropriate by the examiner as the optical characteristic (awareness value) of the eye E to be measured in the subjective measurement. Further, the control unit 70 displays the measurement result 170 of the subjective measurement on the monitor 4 and stores it in the memory 75.

<Objective measurement during subjective measurement>
In addition, the subjective-type optometry apparatus 1 in the present embodiment uses the objective-type measuring unit to measure the optical characteristics of the subject-eye E while the subjective-measurement unit measures the optical characteristics of the subject's eye E. The property can be measured objectively. That is, the subjective optometry apparatus 1 according to the present embodiment can perform the objective measurement during the subjective measurement (for example, while the program for the subjective measurement is being executed).

  The examiner performs subjective measurement on the eye E to be examined. The examiner asks the subject to observe the examination target 150a through the presentation window 3 and asks the direction of the examination target 150, and in consideration of the subject's answer, the correction power for correcting the eye E is appropriate. To see if At this time, at the same time as the subjective measurement for the eye E to be examined, the above-mentioned ring image reflected on the fundus of the eye E is imaged and analyzed, so that the objective measurement for the eye E is performed.

  As described above, the control unit 70 uses the position of the pupil of the eye E and the position of the bright spot image 310 to detect the position of the line of sight of the eye E. Further, the control unit 70 determines whether or not the position of the line of sight of the eye E to be examined is included in the allowable range 152, thereby determining whether or not the eye E to be examined is gazing at the examination target 150a. For example, when the position of the line of sight of the eye E to be examined is included in the allowable range 152, the control unit 70 determines that the eye E to be examined is gazing at the examination target 150a, and the eye E to be examined 150a. You may output the gaze information which shows that gaze is being watched. Further, for example, when the position of the line of sight of the eye E to be examined is not included in the allowable range 152, the control unit 70 determines that the eye E to be examined is not gazing at the examination target 150a, and the eye E to be examined. You may output the gaze information which shows not gazing at the visual target 150a.

  When the objective measurement is performed during the subjective measurement, even if the ring image used for calculating the objective value of the eye E is selected based on the gaze information output in the subjective measurement. Good. For example, the control unit 70 selects only the ring image captured at the timing at which the gaze information indicating that the eye E to be inspected is gazing at the examination target 150a is selected, the ring image is analyzed, and the eye E to be inspected E is selected. The objective value of may be calculated. Of course, for example, the control unit 70 may not use the ring image captured at the timing when the gaze information indicating that the eye E to be inspected is not gazing at the inspection target 150a is output in the analysis process.

  As described above, for example, the optometry system in the present embodiment is an acquisition unit that acquires the anterior segment image of the subject's eye, and based on the anterior segment image, the position of the line of sight at which the subject's eye gazes at the target. Detecting means to detect, based on the position of the line of sight, determination means for determining the gaze state in which the eye to be examined gazes the target, based on the determination result of the determination means, the gaze state in which the eye to be examined gaze the target Output means for outputting the gaze information for indicating. This allows the examiner to easily determine whether or not the eye to be inspected is gazing at the optotype. Further, the examiner can give an appropriate instruction to the subject and accurately measure the optical characteristics of the subject's eye E.

  Further, for example, the optometry system according to the present embodiment determines the gaze state of the subject's eye in real time based on the position of the line of sight of the subject's eye. Therefore, the examiner can immediately perform the remeasurement of the eye to be inspected when the eye gaze state is not appropriate. It is possible to reduce the need to repeat the measurement after the completion of the one measurement, and it is possible to efficiently measure the optical characteristics of the subject's eye.

  Further, for example, the optometry system in the present embodiment, the position of the line of sight of the eye to be inspected, by determining whether or not it is within an allowable range indicating that the eye is gazing, the gaze state of the eye to be inspected judge. For example, the determination standard is clarified by setting the allowable range for the optotype presented to the eye to be inspected, and it is possible to more easily determine whether or not the eye to be inspected is gazing at the optotype.

  Further, for example, the optometry system in the present embodiment determines the gaze state of the eye to be inspected by determining whether or not the position of the line of sight of the eye to be inspected is included in the allowable range for a predetermined time or more. This makes it easier to distinguish between the state where the eye to be examined is gazing at the target and the state where the eye is not gazing, and it is possible to easily determine the state where the eye to be examined is gazing at the target. it can.

  Further, for example, the optometry system in the present embodiment sets a different allowable range for each optotype presented to the subject's eye. For example, since various optotypes are presented to the eye to be examined at the time of eye examination, whether or not the eye to be examined is gazing at the optotype by setting an allowable range according to the size of the optotype or the like. It can be determined more accurately.

  Further, for example, the optometry system in the present embodiment, a display means for an examiner capable of displaying at least a part of the optotype projected on the eye to be examined, and at least a part of the optotype on the display means for the examiner. Display control means for displaying the line-of-sight position mark that indicates the position of the line of sight. With this, the examiner can visually confirm where the examinee is looking at the optotype, and can give an appropriate instruction to the examinee.

  Further, for example, in the optometry system according to the present embodiment, the display control unit further causes the display unit for the examiner to display the allowable range mark indicating the allowable range. This allows the examiner to visually confirm whether or not the position of the subject's line of sight is within the allowable range, in addition to where the examinee is looking at the optotype, and it is You can give various instructions.

<Transformation example>
In this embodiment, the configuration in which the fixation target image 130, the inspection target image 160, the anterior segment observation image 120, and the like are displayed on the monitor 4 provided in the optometry apparatus 1 has been described as an example. Is not limited to this. For example, a monitor connected to the optometry apparatus 1 via wired communication (eg, optical fiber, wired LAN, etc.) or wireless communication (eg, Wi-Fi (registered trademark), Bluetooth (registered trademark), etc.) The optotype image 130, the inspection optotype image 160, the anterior segment observation image 120, and the like may be displayed. As an example, using a controller having an operation unit for operating the optometry apparatus 1 and a display unit for displaying an operation screen for operating the optometry apparatus 1, the fixation target image 130 is displayed on the display unit of the controller. The inspection target image 160, the anterior segment observation image 120, and the like may be displayed.

  In the present embodiment, the configuration in which a message is displayed on the monitor 4 as the gaze information indicating that the eye E is gazing at the optotypes (the fixation target 110 and the inspection target 150) will be described as an example. However, it is not limited to this. The gaze information may be any information that allows the examiner to determine whether or not the subject is gazing at the target. For example, the display color of the permissible range mark M1 in the fixation target image 130 and the permissible range mark M4 in the inspection target image 160 may be changed. Of course, the gaze information may be displayed on the monitor 4, emitted as a voice guide, printed by a printer, or stored in a memory, a server, a cloud, or the like.

  In the present embodiment, the configuration in which the visual target is displayed at the predetermined position on the display 31 has been described as an example, but the present invention is not limited to this. For example, the optotype may be displayed so as to move on the display 31. In this case, the permissible range provided on the optotype may be moved along with the movement of the optotype. For example, a configuration may be adopted in which the eye 31 on the display 31 is displayed while being moved in this way to prompt the eye E to be inspected when the eye E is not gazing at the eye. Further, for example, by displaying the target on the display 31 while moving it, it may be possible to determine whether or not the eye E can follow the target.

  In the present embodiment, the configuration in which the visual line position mark M2 indicating the visual line position of the eye to be inspected is displayed on the fixation target image 130 and the inspection target image 160 has been described as an example, but the present invention is not limited to this. For example, in addition to the line-of-sight position mark M2, the trajectory of the line-of-sight position mark M2 may be displayed. For example, by this, it may be possible to visually determine how the position of the line of sight of the eye E has changed.

  In the present embodiment, the configuration in which the objective measurement and the subjective measurement are performed on either the right eye or the left eye of the eye E to be examined has been described as an example, but the present invention is not limited to this. For example, the configuration may be such that objective measurement and subjective measurement are performed on the right eye and the left eye (that is, both eyes) of the eye E to be inspected. In this case, the control unit 70 detects the position of the line of sight of each of the right eye and the left eye of the eye E, and the fixation target image 130 or the inspection target image 160 indicates the position of the line of sight of the right eye. (Hereinafter, the right line-of-sight position mark) and the line-of-sight position mark indicating the position of the line of sight of the left eye (hereinafter referred to as the left line-of-sight position mark) may be superimposed and displayed.

  When displaying the line-of-sight position marks of both eyes of the eye E to be inspected, information indicating the positional relationship of the line-of-sight of both eyes of the eye E may be acquired from the right line-of-sight position mark and the left line-of-sight position mark. For example, the control unit 70 may acquire the information indicating the positional relationship between the sight lines of both eyes of the eye E by detecting the shift amount of the left sight line position mark from the right sight line position mark. Of course, for example, the control unit 70 may acquire the information indicating the positional relationship between the visual lines of both eyes of the eye E by detecting the direction and the amount of deviation of the right visual line position mark with respect to the left visual line position mark. Further, the control unit 70 may determine whether or not the eye E to be inspected is binocular by using the information indicating the positional relationship of the line of sight of both eyes of the eye E to be inspected. For example, when the amount of deviation between the right eye gaze position mark and the left eye gaze position mark is within a preset allowable range, it may be determined that the visual target is being viewed by both eyes. Further, for example, it may be determined that the visual target is not viewed with both eyes when the shift amount between the right visual line position mark and the left visual line position mark is not within the preset allowable range. The prism amount of the eye E to be inspected may be obtained from the amount of deviation between the right eye gaze position mark and the left eye gaze position mark.

  The optometry apparatus 1 according to the present embodiment can change the distance from the eye E to the display 31 (that is, the inspection distance) by adjusting the convergence angle of the deflection mirror 81. For example, the inspection distance is changed by the control unit 70 controlling the deflection mirror 81 based on the operation signal from the monitor 4 operated by the examiner. Using the optometry device 1, the optical characteristics of the eye E to be inspected at a long distance (for example, an inspection distance of 5 m) and the optical characteristics at a near distance (for example, an inspection distance of 30 cm) are measured. It

  When the optometry apparatus 1 has such a configuration, the control unit 70 can compare the information indicating the position of the line of sight when measuring the optical characteristics for distance vision and the optical characteristics for near vision to the monitor 4. May be displayed in. For example, the control unit 70 may detect the position of the line of sight when the target is presented to the eye E to be examined at the distance inspection distance, and store the detection result in the memory 75. Further, for example, the control unit 70 may detect the position of the line of sight when the target is presented to the eye E to be examined at the near vision inspection distance, and store the detection result in the memory 75.

  The control unit 70 displays information indicating the positions of these lines of sight on the monitor 4. For example, the line-of-sight position for distance vision and the line-of-sight position for near vision may be displayed as the line-of-sight position mark M2 by being superimposed on the inspection target image 160. Further, for example, the position of the line of sight for distance use and the position of the line of sight for near use may be displayed as position information. Accordingly, the examiner can easily determine whether or not the eye E can be viewed binocular regardless of the examination distance, how much the vergence of the eye E has changed, and the like.

  Further, the optometry apparatus 1 according to the present embodiment can change the correction power for correcting the eye E by controlling the correction optical system 60. Therefore, the control unit 70 can compare, to the monitor 4, information indicating the position of the line of sight when the eye E is not corrected and information indicating the position of the line of sight when the eye E is corrected. May be displayed in. For example, the control unit 70 may detect the position of the line of sight when the eye E to be inspected is not corrected and store the detection result in the memory 75. Further, for example, the control unit 70 may detect the position of the line of sight in a state where the eye E to be inspected is corrected and store the detection result in the memory 75.

  The control unit 70 displays information indicating the positions of these lines of sight on the monitor 4. For example, the position of the line of sight when the eye E to be inspected is not corrected and the position of the line of sight when the eye E to be inspected is corrected are respectively displayed as line-of-sight position marks M2 so as to be superimposed on the inspection target image 160. You may. Further, for example, the position of the line of sight when the eye E to be inspected is not corrected and the position of the line of sight when the eye E to be inspected is corrected may be displayed as the position information. Accordingly, the examiner can easily determine whether or not the eyes E can be viewed when the eye E is corrected.

  In the above description, an example in which the position of the line of sight in the state in which the eye E to be inspected is not corrected and the position in which the line of sight is corrected is displayed in a comparable manner has been described. Of course, the control unit 70 displays the information indicating the position of the line of sight in the state where the eye E is corrected with the predetermined correction degree and the line of sight in the state where the eye E is corrected with the correction degree different from the predetermined correction degree. Information indicating the position may be displayed on the monitor 4 in a comparable manner.

DESCRIPTION OF SYMBOLS 1 Optometry apparatus 2 Housing 4 Monitor 5 Jaw stand 7 Measuring unit 10 Objective measurement optical system 25 Subjective measurement optical system 30 Projection optical system 45 First index projection optical system 46 Second index projection optical system 50 Observation optical system 60 Correction optical system 70 Control unit 75 Memory 90 Correction optical system 100 Anterior ocular segment imaging optical system

Claims (9)

An eye examination system for projecting a target onto an eye to be inspected and measuring the optical characteristics of the eye to be inspected,
Acquisition means for acquiring an anterior segment image of the eye to be examined,
Based on the anterior segment image, the detection means for detecting the position of the line of sight at which the eye to be examined gazes at the visual target,
Based on the position of the line of sight, the determination means for determining a gaze state in which the eye to be examined gazes at the target,
Based on the determination result of the determination means, output means for outputting the gaze information for indicating the gaze state,
An optometry system comprising: The optometry system according to claim 1,
The optometry system, wherein the determination means determines the gaze state in real time based on the position of the line of sight. The optometry system according to claim 1 or 2,
The eye examination system, wherein the determination means determines the gaze state by determining whether or not the position of the line of sight is within an allowable range indicating that the eye is gazing. The optometry system according to claim 3,
The eye examination system, wherein the determination unit determines the gaze state by determining whether or not the position of the line of sight is included in the allowable range for a predetermined time or more. The optometry system according to claim 3 or 4,
The optometry system is characterized in that the allowable range is set to a different range for each of the optotypes. The optometry system according to any one of claims 1 to 5,
Display means for an examiner capable of displaying at least a part of the optotype projected on the eye to be examined,
Display control means for displaying at least a part of the visual target on the display means, and displaying a visual line position mark indicating the position of the visual line,
An optometry system comprising: The optometry system according to claim 6,
The display control means further causes the display means to display an allowable range mark indicating the allowable range. The optometry system according to any one of claims 1 to 7,
Having a measuring means for measuring the optical characteristics of the eye to be examined,
The measuring means is disposed in an optical path of the light projecting optical system for projecting the target light flux emitted from the target presenting section for presenting the target onto the eye to be inspected, and A correction optical system for changing the optical characteristics of the standard light flux, and an optometry system for subjectively measuring the optical characteristics of the subject's eye. The optometry system according to any one of claims 1 to 8,
The measuring means includes a projection optical system that projects a target light beam onto the fundus of the eye to be inspected, and a light receiving optical system that receives a reflected light beam in which the target light beam is reflected. An optometry system which is an objective measuring means for objectively measuring optical characteristics.

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