WO2020050233A1

WO2020050233A1 - Ocular refractivity measuring device

Info

Publication number: WO2020050233A1
Application number: PCT/JP2019/034495
Authority: WO
Inventors: 通浩滝井; 大森　豊
Original assignee: 株式会社ニデック
Priority date: 2018-09-05
Filing date: 2019-09-02
Publication date: 2020-03-12
Also published as: JPWO2020050233A1; JP7352198B2

Abstract

Provided is an ocular refractivity measuring device capable of solving at least one problem in the conventional art with regard to measuring ocular refractivity while a refraction correcting mechanism is worn. An ocular refractivity measuring device according to the present disclosure is provided with: a measurement optical system for measuring the ocular refractivity of an eye to be inspected; a visual target presentation optical system for presenting a visual target to the eye to be inspected via a correction optical system provided on the device main body side; and a control means for controlling the ocular refractivity measuring device, wherein the control means implements: an over-refraction mode for measuring an over-refraction value which is a refractivity value in a worn state of a refractivity correction instrument; and a comparison mode for comparing how the visual target appears to a person to be inspected when in a corrected state, in which the correction optical system is controlled, and the visual target is corrected on the basis of the over-reaction value, and when in a non-corrected state, in which additional correction is not performed on the worn state by the correction optical system, by switching between the states.

Description

Eye refractive power measuring device

The present disclosure relates to an eye-refractive-power measuring device that measures the eye refractive power of an eye to be examined.

As an eye-refractive-power measuring device for measuring the eye-refractive power of the eye to be examined, an apparatus has been proposed which assumes that the eye-refractive power is measured while wearing eyeglasses (for example, see Patent Document 1).

JP 2001-161644 A

However, in the conventional refractive power measuring device, it has not been established how to use the measurement data in a state in which the refractive correction instrument is worn. For example, subjects have not been able to feel the need for new refractive instruments.

開示 The present disclosure has a technical problem to provide an eye refractive power measurement device capable of solving at least one problem of the related art when measuring an eye refractive power while wearing a refraction correcting device.

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

An eye-refractive-power measuring device for measuring an eye refractive power of an eye to be inspected, comprising a measurement optical system for measuring the eye refractive power of the eye to be inspected, and a target for the eye to be inspected through a correction optical system provided on a main body side of the device. And a control means for controlling the eye-refractive-power measuring device, wherein the control means sets an overref value, which is an eye refractive power in a wearing state in which a refractive correction instrument is worn. Overref mode to be measured, controlling the correction optical system, a state corrected based on the overref value, and a non-correction state in which no additional correction is performed by the correction optical system on the wearing state. , And a comparison mode in which the subject compares the appearance of the optotype is executed.

According to the present disclosure, it is possible to effectively use the measurement data of the eye refractive power in a state where the refractive correction device is worn.

FIG. 1 is a diagram illustrating an example of an external configuration of an eye refractive power measurement device according to a present embodiment. It is a figure showing an example of an optical system of an eye refractive power measuring device concerning this example. 5 is a flowchart illustrating an example of an operation of the eye-refractive-power measuring device according to the embodiment. FIG. 6 is a diagram illustrating an example of a measurement screen according to the embodiment. It is a figure showing an example of the picture which picturized temporary frame glasses.

<Example>
Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In the following embodiments, an eye refractive power measuring apparatus 1 that objectively measures the eye refractive power of the eye E to be inspected will be described as an example. The eye refractive power measuring device includes, for example, an auto-refractometer, an ocular aberrometer, and the like.

First, an example of an external configuration of the eye-refractive-power measuring device 1 will be described with reference to FIG. The eye refractive power measuring device 1 shown in FIG. 1 is a so-called stationary device. The eye-refractive-power measuring device 1 mainly has a measuring unit 8. As will be described in detail later, the measuring unit 8 is provided with at least an optical system used when measuring the eye characteristics. Note that the eye refractive power measuring device 1 may be a hand-held device.

In addition, in the example of FIG. 1, the eye-refractive-power measuring apparatus 1 further includes a base 2, a face support unit 4, a moving base 6, a driving unit 7, a joystick 9, and a display unit 70.

The moving table 6 is supported by the base 2. The movable table 6 is moved on the base 2 in the vertical direction (Y direction) and the front-rear direction (Z direction) by operating the joystick 9. A face support unit 4 is fixed to the base 2. As shown in FIG. 1, the face support unit 4 is used to support the face of the subject with the subject's eye E facing the measurement unit 8. The driving unit 7 moves the measuring unit 8 in the left-right direction (X direction), the up-down direction (Y direction), and the front-back direction (Z direction) with respect to the eye E to be examined. When the examiner rotates the rotation knob 9 a provided on the joystick 9, the measurement unit 8 is moved in the Y direction by the drive unit 7. On the top of the joystick 9, a switch 9b is provided. The display unit 70 displays various information such as an observation image of the eye E captured by the measurement unit 8 and a measurement result of the eye E by the measurement unit 8.

Next, an optical system included in the measuring unit 8 of the eye refractive power measuring device 1 will be described with reference to FIG. The measuring unit 8 includes, for example, a measuring optical system 10, an observation optical system (imaging optical system) 50, a target presenting optical system 30, a ring target projecting optical system 45, a working distance target projecting optical system 46, and illumination. A light source 48.

測定 The measurement optical system 10 shown in FIG. 2 is used for measuring the eye refractive power of the eye to be examined. The measurement axis of the measurement optical system 10 is the optical axis L1. The measuring optical system 10 has a light projecting optical system 10a and a light receiving optical system 10b. The light projecting optical system 10a projects the measurement light beam onto the fundus Er of the eye E through the pupil of the eye E. Further, the light receiving optical system 10b captures the fundus reflection light from the measurement light beam as a ring-shaped fundus reflection image with the two-dimensional imaging element 22 (an example of a detector). The ring image may be a continuous ring image or an intermittent ring image (for example, an intermittent ring image with a plurality of points).

For example, the light projecting optical system 10a includes a measurement light source 11, a relay lens 12, a hole mirror 13, and an objective lens 14. The light receiving optical system 10b shares the hole mirror 13 and the objective lens 14 with the light projecting optical system 10a. The light receiving optical system 10b includes a relay lens 16, a total reflection mirror 17, a light receiving aperture 18, a collimator lens 19, a ring lens 20, and a two-dimensional image sensor 22 (hereinafter, referred to as an "image sensor 22"). And These measuring optical systems 10 are provided in the transmission direction of the beam splitter 29 in the example of FIG.

The ring lens 20 of the light receiving optical system 10b is an optical element for shaping the fundus reflection light into a ring shape. The ring lens 20 has a lens portion formed in a ring shape, and a light shielding portion in which a region other than the lens portion has a light shielding coating. The ring lens 20 has an optically conjugated positional relationship with the pupil of the eye E to be examined. The ring-shaped fundus reflection light (that is, a two-dimensional pattern image) via the ring lens 20 is received by the image sensor 22. The imaging element 22 outputs the received image information of the two-dimensional pattern image to the control unit 80. Accordingly, it is possible to display the two-dimensional pattern image on the display unit 70 or to calculate the refractive power of the eye E based on the two-dimensional pattern image. Note that a light receiving element such as an area CCD can be used as the imaging element 22.

The measurement optical system 10 is not limited to the above-described one, and various known configurations may be used as a configuration for objectively measuring the eye refractive power. Further, the measurement optical system 10 that objectively measures the eye refractive power may be an eye aberration measurement optical system that can measure the higher order aberrations of the subject's eye, including, for example, a Shack-Hartmann sensor. It may be a configuration. Of course, other measurement type devices may be used (for example, a phase difference type device that projects a slit).

ビーム A beam splitter 29 is disposed between the objective lens 14 and the hall mirror 13. The beam splitter 29 guides a light beam from a target presenting optical system 30 to be described later to the eye E, and guides reflected light from the anterior segment of the eye E to the observation optical system 50. Further, the beam splitter 29 reflects a part of the fundus reflection light emitted from the light source 11 and reflected by the fundus Er and guides it to the observation optical system 50, transmits other fundus reflection light, and transmits the other fundus reflection light to the light receiving optical system 10b. Lead to.

The optotype presenting optical system 30 is an optical system for presenting an optotype to the eye E to be inspected. The optotype presenting optical system 30 shares the objective lens 14 of the observation optical system 50, and includes a light source 31 such as an LED and an optotype plate 32 disposed on an optical axis L <b> 5 coaxial with the optical axis L <b> 1 by a beam splitter 29. , A relay lens 33 and a reflection mirror 36. Further, the optotype presenting optical system 30 is shared with a correction optical system 60 for correcting the refractive power of the eye to be examined.

The optotype plate 32 includes a plurality of optotypes (fixation targets) 32a for performing fogging on the eye E at the time of measuring objective refractive power and a plurality of visual acuity test targets used at the time of measuring subjective refractive power. Marks 32b are arranged on concentric circles. As the visual acuity test optotype, optotypes (acuity values of 0.1, 0.3,..., 1.5) for each visual acuity value are prepared. The optotype plate 32 is rotated by a motor 37, and the

optotypes

32a and 32b are switched and arranged on the optical axis L5 of the optotype presenting optical system 30. Optotype luminous fluxes of the

optotypes

32a and 32b illuminated by the light source 31 travel toward the eye E via optical members from the relay lens 33 to the beam splitter 29.

(4) The light source 31 and the optotype plate 32 (the

optotypes

32a and 32b) of the eye E to be examined are integrally moved by the driving section 62 in the direction of the optical axis L5. By moving the light source 31 and the

optotypes

32a and 32b, the presenting position (presentation distance) of the optotype is optically changed from a long distance to a short distance. Thus, the fog is applied to the eye E during objective refractive power measurement, and the spherical refractive power of the eye E is corrected during subjective refractive power measurement. In other words, the objective lens 14, the relay lens 33, the light source 31, and the optotype plate 32 move to form the spherical power correcting optical system 61. The optical system 61 for correcting the spherical power may be configured such that a relay lens movable in the optical axis direction is added to the optotype presenting optical system.

The optical system 63 for correcting astigmatism is disposed between the reflection mirror 36 and the relay lens 33. The astigmatism correction optical system 63 includes two positive cylindrical lenses 64 (64a, 64b) having the same focal length. The

cylindrical lenses

64a and 64b are independently rotated about the optical axis L5 by driving the

rotation mechanisms

65a and 65b, respectively. By rotating the two

cylindrical lenses

64a and 64b, the astigmatism of the subject can be corrected. The correction optical system 60 may have a configuration in which the correction lens is moved in and out of the optical path of the optotype presenting optical system.

リング A ring index projection optical system 45 and a working distance index projection optical system 46, which are examples of the alignment index projection optical system, are arranged in front of the anterior segment of the eye E. The ring target projection optical system 45 is used to project the ring target on the central region of the cornea of the eye to be examined. The ring target projection optical system 45 may be, for example, a projection optical system that projects the Meyer ring on the eye to be inspected.

In the present embodiment, the ring target projection optical system 45 projects infrared light (for example, near infrared light) onto the cornea Ec in a ring shape. As a result, a ring target image is formed on the cornea Ec. The corneal vertex (substantially corneal vertex) is detected as the center position of the ring image.

リング The ring index projected on the cornea may be used as an alignment index for performing alignment with the subject's eye. Further, the ring index may be used as an index for measuring a corneal shape. The ring target projection optical system 45 may be used as an anterior segment illumination for illuminating the anterior segment of the eye E.

The working distance index projection optical system 46 is used, for example, to project an index for performing alignment in the working distance direction. The alignment index projected on the cornea is used for alignment with the eye to be inspected (for example, automatic alignment, alignment detection, manual alignment, and the like). The projection optical system 46a is an optical system for projecting a finite distance index on the cornea Ec of the eye E, and the projection optical system 46b is an optical system for projecting an infinity index on the cornea Ec of the eye E. is there. The working distance index projection optical system 46 uses, for example, infrared light (for example, near infrared light). In the present embodiment, the working distance index projection optical system 46 is formed at a position deviating from the ring index, but is not limited to this. For example, an infinity index is projected on a cut portion of the ring index projection optical system 45. A projection optical system may be provided, and alignment in the working distance direction may be performed using the ring index and the infinity index.

The illumination light source 48 may be used, for example, as a light source for illuminating an anterior ocular segment of a subject's eye in a state where a refraction correction instrument is worn. The illumination light source 48 is disposed at a position set so as to avoid that the reflected light from the spectacle lens due to the illumination light is included in the anterior ocular segment image. Alignment with the eye to be examined can be performed smoothly. The illumination light source 48 may be an infrared light source or a visible light source.

In this case, for example, the illumination light source 48 may be arranged at a position inclined by 30 ° or more with respect to the measurement optical axis L1 of the measurement optical system 10. As a result, the reflected image from the spectacle lens by the illumination light source 48 is formed at a position distant from the measurement optical axis L1, so that the reflected image is not included in the anterior ocular segment image or is included in the anterior ocular segment image. Even if it is included, it is formed around the anterior ocular segment image. As a result, artifacts when performing alignment on the eye to be examined are reduced. When an artifact is formed in the peripheral portion of the anterior ocular segment image, the central portion of the anterior ocular segment image does not include an artifact, and alignment with the cornea center, the pupil center, or the like becomes easy.

The observation optical system (imaging optical system) 50 has an imaging element 52 that captures a front image of the anterior segment of the eye E to be inspected. In the present embodiment, the observation optical system 50 shares the objective lens 14 and the beam splitter 29 with the optotype presenting optical system 30. The observation optical system 50 includes a half mirror 53, an imaging lens 51, and a two-dimensional imaging device 52 (hereinafter, referred to as “imaging device 52”). The imaging element 52 is a light receiving element having an imaging surface arranged at a position substantially conjugate to the anterior segment of the eye E. With this imaging element 52, a front image of the anterior segment of the subject's eye E is captured. The output from the image sensor 52 is input to the control unit 80. As a result, a live image of the front image captured by the image sensor 52 is displayed on the display unit 70 as an observation image. In the present embodiment, the observation optical system 50 detects an alignment index image (in the present embodiment, a ring index and an infinity index) formed on the cornea Ec of the eye E by the index projection

optical systems

45 and 46. Also serves as an optical system. The position of the alignment index image is detected based on the result of imaging of the alignment index image by the imaging element 52. Note that the observation optical system 50 can capture a front image of the anterior segment of the subject's eye in the wearing state illuminated by the illumination light source 48.

Next, a control system of the eye-refractive-power measuring device 1 will be described with reference to FIG. The eye refractive power measuring device 1 is controlled by the control unit 80. The control unit 80 is a processing device (processor) having an electronic circuit that performs control processing of each unit and arithmetic processing. The control unit 80 is realized by a CPU (Central Processing Unit), a memory, and the like. The control unit 80 is electrically connected to each of the

light sources

11 and 31, the

imaging devices

22 and 52, the movable base 6 and the drive unit 7, the joystick 9, the display unit 70, the operation unit 90, and the memory 105.

The memory 105 may be a rewritable nonvolatile storage device. The memory 105 may store at least a program for causing the control unit 80 to execute the measurement operation.

The control unit 80 controls each member of the eye-refractive-power measuring device 1 based on an operation signal output from the operation unit 90. The operation unit 90 may be a pointing device such as a touch panel or a mouse, or may be a keyboard or the like.

In the present embodiment, the control unit 80 automatically or automatically sets a naked-eye reflex mode for measuring the eye refractive power in the naked eye state and an over-reflective mode for measuring the eye refractive power in a state in which the refraction correction device is worn. It may be possible to switch manually. For example, the control unit 80 may switch the measurement mode based on an operation signal from the operation unit 90.

The control unit 80 may perform the automatic alignment of the measurement unit 8 with respect to the subject's eye by controlling the driving unit 7 based on the detection result of the alignment state detected as described above. Further, the control unit 80 may notify a detection result of the alignment state detected as described above to the examiner (for example, the detection result may be electronically displayed on the display unit 70).

<Operation of the device>
An example of the operation of the device having the above configuration will be described. FIG. 3 is a flowchart illustrating the operation of the device according to the present embodiment. In the following description, a description will be given of a case where the refractive power of the eye to be examined is measured in the naked eye state where the refractive correction device is not worn, and a case where the refractive power of the eye to be inspected is measured in the wearing state where the refractive correction device is worn. I do. Here, the wearing state is, for example, a state in which a spectacle lens is disposed in front of the eye via a spectacle frame, a state in which a contact lens is disposed in front of the eye, or the like.

(S1: naked eye mode)
First, the control unit 80 measures the subject's eye in the state of the naked eye without wearing the refractive component instrument. In this case, the examiner operates the operation unit 90 to set the mode to the naked eye mode (normal mode). In the naked eye mode, for example, a ring index by the ring index projection optical system 45 and an index by the working distance index projection optical system 46 are projected on the eye to be examined. The ring index is used for anterior segment illumination and alignment detection.

The examiner fixes the face of the subject to the face support unit 4 and instructs the subject to fixate on the fixation target 32a of the target plate 32. Next, alignment of the measurement unit 8 in the X, Y, and Z directions with respect to the subject's eye is performed. The examiner operates the joystick 9 and the rotary knob 9a while observing the display unit 70 to perform rough alignment. For rough alignment, automatic alignment may be performed using a camera or the like that can photograph the face of the subject in a wide range.

The control unit 80 causes the display unit 70 to display an observation image of the anterior eye taken through the observation optical system 50 as needed (see FIG. 4). That is, the display unit 70 displays a front image (live image) of the anterior segment photographed substantially in real time. The reticle mark LT indicates the position of the measurement axis in the measurement section 8 (in this embodiment, the measurement optical axis L1 of the measurement optical system 10).

When rough alignment is performed and the ring index image by the ring index projection optical system 45, the infinity index, and the finite distance index by the working distance index projection optical system 46 are captured by the image sensor 52, the control unit 8090 By controlling the driving of the drive unit 7 based on the imaging signal from the imaging element 52, the measuring unit 8 is moved in the XY direction or the Z direction, and the detailed alignment of the measuring unit 8 with respect to the eye to be inspected is performed.

The control unit 80 calculates the coordinates of the center position of the ring index image detected by the imaging element 52 to obtain the alignment state in the up, down, left, and right directions with respect to the subject's eye. The corneal center position can be obtained by detecting the center position of the ring index image.

When the measurement unit 8 is displaced in the Z (working distance) direction with respect to the eye to be inspected, the control unit 80 changes the image interval of the finite distance index while the image interval of the infinity index hardly changes. Using this characteristic, an alignment state in the working distance direction with respect to the eye to be examined is determined (for details, see Japanese Patent Application Laid-Open No. 6-46999). The configuration and the detection method for the alignment detection in the Z direction are not limited to the above, and for example, the degree of blurring of the ring index image or the like may be used.

After that, when alignment is completed, reflex measurement is performed. In this case, the measurement light from the measurement light source 11 is projected on the fundus via the measurement optical system 10, and the fundus reflection light by the measurement light is received by the imaging device 22 via the measurement optical system 10. In this case, first, a preliminary measurement of the eye refractive power is performed. Then, based on the result of the preliminary measurement, the light source 31 and the optotype plate 32 are moved in the direction of the optical axis L5, so that the subject's eye is fogged. After that, the eye refractive power is measured for the fogged eye.

In the measurement of the eye refractive power (and the preliminary measurement), the control unit 80 obtains the eye refractive power by processing the output signal from the image sensor 22. An output signal from the image sensor 22 is stored in the memory 105 as image data (measurement image). After that, the control unit 80 specifies the position of the ring image for each meridian of the ring based on the image data stored in the memory 105. Next, the control unit 80 approximates the ellipse using the least squares method or the like based on the image position of the specified ring image. Then, the control unit 80 obtains the refraction error in each meridian direction from the approximated elliptical shape, and based on this, the eye refraction value (S (spherical power), C (column power), and A (astigmatism) of the eye E to be examined. Axis angle)). Then, the measurement result is displayed on the display unit 70. Further, the control unit 80 may store the measurement result of the eye refraction value or the like in the memory 105. In this case, the control unit 80 may display a determination display 71 indicating that the subject's eye in the naked eye state has been measured, together with the measurement result.

When measuring the eye refractive power of the eye to be examined in the naked eye state, the control unit 80 further measures the corneal shape of the eye to be examined based on the ring index and displays the measurement result of the corneal shape on the display unit 70. You may do so.

(S2: over-reflection mode)
When measuring the eye to be examined while wearing the refraction correcting device, the examiner operates the operation unit 90 to set the overref mode. In the over-reflection mode, for example, the projection of the ring index by the ring index projection optical system 45 and the index by the working distance index projection optical system 46 is limited, and the illumination light from the illumination light source 48 is projected onto the eye to be examined. In this case, only the projection of the ring index may be limited. Illumination light from the illumination light source 48 is used, for example, for observing an anterior eye image, and alignment is performed on the subject's eye using the anterior eye image. In the following description, the same parts as those in the naked eye mode will not be specifically described.

When rough alignment is performed and the pupil of the subject's eye is imaged by the image sensor 52, the control unit 8090 controls the drive of the drive unit 7 based on the image signal from the image sensor 52 to perform measurement. The unit 8 is moved in the XY direction or the Z direction to perform detailed alignment of the measuring unit 8 with respect to the eye to be inspected.

The control unit 80 analyzes the pupil imaged by the image sensor 52 by image processing, calculates the position of the pupil, and obtains the alignment state in the vertical and horizontal directions with respect to the eye to be examined.

The control unit 80 uses the characteristic that the anterior eye image (for example, the pupil) is blurred when the measurement unit 8 is displaced from the eye in the Z (working distance) direction, and The alignment state of the measuring unit 8 in the working distance direction may be obtained. For example, the control unit 80 moves the measuring unit 8 in the Z direction, acquires an evaluation value of the edge (blur condition) of the anterior eye image at each Z position, and measures a position having a high evaluation value as an appropriate position. The unit 8 may be moved.

After that, when alignment is completed, reflex measurement is performed. In this case, the measurement light from the measurement light source 11 is projected onto the fundus through the measurement optical system 10 and the refraction correction device ML, and the fundus reflection light of the measurement light is imaged through the refraction correction device ML and the measurement optical system 10. The light is received by the element 22. In this case, a preliminary measurement of the eye refractive power is performed, and thereafter, the measurement of the eye refractive power is performed on the eye to which the fogging is applied.

The control unit 80 calculates the eye refraction value of the eye to be inspected based on the imaging result of the imaging element 22, and displays the measurement result on the display unit 70. The control unit 80 may store the measurement result of the eye refraction value in the memory 105. In this case, the control unit 80 may display a discrimination display 72 indicating that the eye to be inspected in a state where the refraction correction instrument is worn is measured, together with the measurement result. Thus, it is possible to prevent the measurement values from being mistaken between the over-reflection mode and the naked eye mode.

<Automatic determination of wearing state>
In the above description, the measurement mode is switched based on the operation signal from the operation unit 90. However, the present invention is not limited to this, and the measurement mode may be automatically switched. For example, the control unit 80 may switch the measurement mode based on an imaging signal output from the observation optical system 50. Here, the control unit 80 may determine whether or not the refraction correction instrument is worn based on the imaging signal output from the observation optical system 50, and switch the measurement mode based on the determination result.

In this case, for example, when projecting the ring index from the ring index projection optical system 45 to the eye to be inspected while wearing spectacles, a large amount of reflected light from the spectacle lens is incident on the imaging device 52 of the observation optical system 50, and the naked eye The fact that the luminance value of the entire anterior segment image is higher than the state may be used. Here, when the area of the pixel exceeding the predetermined threshold in the anterior ocular segment image exceeds the allowable range, the control unit 80 determines that there is a spectacle lens, sets an overref mode, and sets a predetermined value in the anterior ocular segment image. When the area of the pixel exceeding the threshold value falls below the allowable range, it may be determined that there is no spectacle lens and the naked eye mode may be set. Further, the edge of the contact lens may be detected from the anterior segment image captured by the image sensor 52, and the presence or absence of the contact lens may be determined based on the presence or absence of the edge. Needless to say, the method of determining whether or not the refraction correction device is worn is not limited to this. For example, the control unit 80 determines whether or not there is a spectacle frame imaged by the imaging device 52 during alignment by performing image processing. The measurement mode may be switched based on the result. Further, the control unit 80 may determine whether or not there is a lens reflection in the central region of the image captured by the image sensor 52. Further, for example, a spectacle frame may be detected by a face photographing unit capable of photographing a face including both eyes of the subject, and the wearing state of the subject's eye may be determined.

The control unit 80 may display the naked-eye reflex value (the reflex value measured in the naked-eye mode) and the over-reflection value (the reflex value measured in the over-reflective mode) on the display unit 70 for comparison. For example, as shown in FIG. 4, the control unit 80 may display the spherical power (S), the astigmatic power (C), and the astigmatic axis (A) measured in each measurement mode. Thereby, the control unit 80 can indicate a guideline as to whether or not the wearing state of the refractive correction instrument is appropriate. For example, if the correct refraction instrument is worn, the overref value should be 0D (diopter). Therefore, when the overref value is not 0D or when the overref value is larger than a certain threshold, the control unit 80 may notify the examiner that the power of the refraction correction instrument is not correct. For example, the control unit 80 may display a warning on the display unit 70 or the like. In this case, the examiner proposes to the subject to change the power of the refractive correction instrument. The threshold value of the overref value when notifying the examiner may be set in advance by the examiner.

In addition, when the correction instrument frequency 75 which is the refractive power of the refractive correction instrument worn by the optometry is acquired, the control unit 80 sets the naked eye reflex value 73, the overref value 74, the correction instrument frequency 75, May be displayed side by side on the screen of the display unit 70. The control unit 80 may acquire the correction instrument frequency 75 based on the input to the operation unit 90 by the examiner, or may acquire the correction instrument frequency 75 by being transferred from an external device such as a lens meter. When the measurement is performed while wearing the temporary frame glasses VM, the control unit 80 may acquire the refraction power written on the temporary frame glasses VM by recognizing the refractive power with a camera. In this case, the control unit 80 uses the image sensor 52 of the observation optical system 50 or the face photographing unit 5 that photographs the face image 500 including both eyes of the subject, and the like. 510 may be recognized (see FIG. 5). As described above, the control unit 80 may function as a frequency acquisition unit that acquires the correction appliance frequency 75.

When the corrective instrument frequency 75 has been acquired, the control unit 80 compares the naked-eye reflex value 73, the over-reflex value 74, and the corrective instrument frequency 75 to determine whether the currently worn refractive corrective instrument is appropriate. It may be determined. For example, the control unit 80 may detect the abnormality of the refraction correction device based on the difference K between the naked-eye reflex value 73 and the correction device frequency 75 and the difference Q between the difference K and the overref value 74. Normally, the difference K between the powers of the eye to be inspected and the refractive instrument (the naked eye reflex value 73 and the power of the corrective instrument 75), and the frequency of the simultaneous measurement of the eye to be inspected and the refraction instrument in the overreflection mode (overref) Values) are the same, so the difference Q should be 0D. Therefore, when the difference Q is not 0D or when the difference Q is larger than a certain threshold value, the control unit 80 may notify the examiner that fitting of glasses or the like may be bad. For example, the control unit 80 may display a warning on the display unit 70. In this case, for example, the examiner adjusts the nose pad or the temple of the glasses. The threshold value of the overref value when notifying the examiner may be set in advance by the examiner.

Even if the corrective instrument frequency 75 is not acquired, the control unit 80 may display the difference between the naked-eye reflex value 73 and the overref value 74 as the corrective instrument frequency 75. Thereby, the examiner can know the standard of the refraction power of the refraction correction instrument currently worn.

(S3: comparison mode)
The control unit 80 executes the comparison mode in the overref mode. The comparison mode is a mode in which the subject is compared between the appearance of the currently used refraction correction instrument and the appearance of the appropriate refraction correction instrument. For example, the control unit 80 controls the correction optical system 60 such that the correction state is based on the overref value. For example, the control unit 80 moves the fixation target 32a to a position where the fixation is performed at the spherical power of the overref value (-0.25D in the example of FIG. 4), and the astigmatic power of the overref value (FIG. In this example, the cylindrical lens 64 is rotated so as to be in a state corrected by -0.25D) and the astigmatic axis (180 degrees in the example of FIG. 4). As a result, the subject can experience how the optotype looks while wearing the appropriate corrective refraction instrument. When the examiner presses the comparison button 90a of the operation unit 90, the driving unit 62 moves the fixation target 32a to the reference position in the comparison mode (correction state is 0D = infinity or long distance 5m), that is, the non-correction state. Is controlled. Further, the cylindrical lens 64 is driven such that the astigmatism degree of the astigmatism correction optical system 63 becomes 0D. As a result, the subject can experience how the visual target looks while wearing the current refraction correction device. Each time the examiner presses the comparison button 90a, the control unit 80 sets a state in which the correction is performed by the correction optical system 60 based on the overref value and a non-correction state in which the correction by the correction optical system 60 is released (that is, the refraction state). (A state in which additional correction is not performed by the correction optical system 60 with respect to the correction state by the correction tool). This allows the subject to compare the appearance with the appropriate refraction correction instrument with the appearance with the currently used refraction correction instrument.

As described above, based on the eye refractive power in the wearing state measured in the over-reflection mode, to compare the appearance with the currently worn refractive correction device and the appearance with the appropriate refractive correction device. This allows the subject to confirm the necessity of an appropriate refraction corrector. That is, the eye-refractive-power measuring apparatus according to the present embodiment can effectively utilize the overref value measured in the overref mode, which is measured in a state where the refraction correction instrument is worn.

The control unit 80 may perform various measurements in a state where the subject wears the refraction correction device. For example, the control unit 80 may perform subjective measurement while wearing a refraction correction device. In this case, the control unit 80 presents the optotype of the optotype presenting optical system to the subject's eye in the wearing state. For example, the control unit 80 presents a visual acuity test target 32b such as a Landolt's ring to the subject's eye. The examiner operates the operation unit 90 to switch the visual acuity value of the visual target while checking the appearance of the subject, and obtains the maximum visual acuity of the subject. Note that, similarly to the objective measurement, the control unit 80 may display a determination display indicating that the eye to be examined in the wearing state has been measured, together with the measurement result.

The control unit 80 may measure the accommodation power of the subject's eye while wearing the refraction correcting device. In this case, the control unit 80 objectively or subjectively measures the accommodation power. When measuring objectively, for example, the control unit 80 measures the refractive power by the measuring optical system 10 while gradually approaching the target presentation position by the correction optical system 60. By analyzing the accommodation power of the current refraction corrector based on this measurement result, a guideline such as eye fatigue can be shown. In the case of subjective measurement, the control unit 80 can present a near target and change the power to experience the power that does not cause fatigue.

The control unit 80 may execute the addition comparison mode while wearing the refraction correcting device. The addition comparison mode is, for example, a measurement mode that allows the subject to confirm the difference in appearance due to the presence or absence of the addition by switching between a state where the addition is added and a non-subscription state where the addition is not added. . For example, the control unit 80 presents the target 32a at a nearby presentation position (for example, a presentation position of 35 cm) to the subject wearing the refraction correction instrument, and a correction state based on the overref value, and The presentation position of the optotype 32a is switched by moving the optotype presenting optical system to a state where a predetermined addition power is added thereto. The addition frequency may be changed based on an input to the operation unit 90. When the comparison button 90a is pressed after the addition is set, a state where the addition is added and a state where the addition is not added are switched. Thus, the subject can confirm the usefulness of the multifocal lens or the progressive lens with added power. Note that the addition may be set based on an objective measurement result such as accommodation power measurement.

The control unit 80 may measure the adjustment tension parameter while wearing the refraction correcting device. Thereby, the control unit 80 may quantify the degree of comfort of the refraction corrector currently worn. For example, the control unit 80 changes the presenting position of the optotype stepwise from far to near, measures the refracting power at each of the presenting positions of the optotype in a short cycle (for example, 12 Hz), and measures the refraction at that time. Measure power fluctuations. Fluctuation is small in a normal (comfortable) state, but in a state with eye strain, fluctuation of the refractive power occurs. Therefore, the control unit 80 can indicate the degree of comfort of the refraction correction instrument currently worn by digitizing the fluctuation. For a specific method, see, for example, JP-A-2005-177354. The control unit 80 changes the correction state under the control of the correction optical system 60, creates a state corrected with a refractive power different from the refractive correction instrument worn by the subject, and measures the adjustment tension parameter. You may.

When the correction instrument frequency 75 is acquired, the control unit 80 may compare the appearance with the naked eye in the comparison mode. For example, the control unit 80 corrects the appearance so as to be able to compare the three appearances, that is, the appearance with the currently worn refraction correction instrument, the appearance with the appropriate refraction correction instrument, and the appearance with the naked eye. The optical system 60 may be controlled. In this case, the control unit 80 switches the correction state between a non-correction state, a state corrected based on the overref value, and a state in which the correction tool frequency 75 is subtracted (cancelled). This allows the subject to correct the difference between the appearance of the naked eye with the current refraction instrument and the appearance of the naked eye with the appropriate refraction instrument. You can experience it virtually without removing the equipment.

The control unit 80 may determine whether the refraction correction device worn by the subject has a light blocking function. In this case, the control unit 80 may determine the presence or absence of the light blocking function by analyzing images acquired by the face photographing unit 5, the observation optical system 50, the measurement optical system 10, and the like. For example, when a face image captured by the face capturing unit 5 is used, the presence or absence of the light blocking function may be determined based on the brightness, contrast, edge, or the like of the peripheral area of the subject's eye on the face image. The peripheral region of the subject's eye is, for example, a portion that has passed through a lens of an eye refraction corrector having a light blocking function. For example, the control unit 80 may determine the presence or absence of the light blocking function based on whether the brightness, contrast, or edge of the peripheral area of the subject's eye satisfies a predetermined condition. For example, when the brightness, contrast, or edge of the peripheral area of the subject's eye in the face image is smaller than a predetermined value, the control unit 80 determines that the refraction correction device has a light blocking function, and the contrast or edge is larger than the predetermined value. In such a case, it may be determined that the refraction correcting device does not have the light shielding performance. Similarly, when using the anterior ocular segment image captured by the observation optical system 50, the control unit 80 determines whether or not the brightness, contrast, or edge of the anterior ocular segment image is sunglasses based on whether or not a predetermined condition is satisfied. May be determined.

Similarly, when using a measurement image (ring image) captured by the measurement optical system 10, the control unit 80 determines whether or not the brightness, contrast, or edge of the ring image satisfies a predetermined condition. It may be determined whether the device has a light blocking function. For example, when the subject wears sunglasses, the brightness, contrast, or edge of the ring image is reduced. Therefore, when the brightness, contrast, or edge of the ring image is smaller than the predetermined value, the control unit 80 may determine that the corrective refraction instrument has a light blocking function.

The control unit 80 may determine whether or not the user is wearing a refraction correction device using an infrared cut lens or a blue light cut lens. The infrared cut lens or blue light cut lens has a light blocking function such as infrared cut or blue light cut. Even when light of a specific wavelength is cut by an infrared cut lens, a blue light cut lens, or the like, the luminance of a face image, an anterior segment image, a measurement image, or the like decreases. Therefore, similarly to the above-described determination of the light-shielding function, the control unit 80 determines whether the refraction correction instrument has an infrared cut lens or a blue light cut based on luminance information such as a subject's face image, anterior eye image, and measured image. It may be determined whether or not a lens is used.

The control unit 80 may increase the amount of measurement light or alignment light when determining that the refraction correction device worn by the subject has a light blocking function. For example, when the subject wears sunglasses, the alignment light or the measurement light is blocked by the sunglasses, and the brightness of the anterior eye image or the measurement image decreases. For this reason, the controller 80 may increase the light amount of the alignment light or the measurement light in consideration of the fact that the alignment light or the measurement light is blocked by the sunglasses. Thus, even if the alignment light or the measurement light is blocked by sunglasses or the like, it may be possible to prevent the analysis of the anterior eye image or the measurement image from being hindered.

The degree of refraction when passing through a refraction correction instrument varies depending on the wavelength of the measurement light. Therefore, the control unit 80 may correct the measurement result in consideration of the wavelength of the measurement light. For example, the control unit 80 may perform correction so that the refractive power becomes larger when the measurement is performed using the measurement light having a longer wavelength than when the measurement is performed using the measurement light having a shorter wavelength.

Note that the comparison button 90a may be arranged on the subject side so that the subject himself can operate the button, or the comparison button 90a may be automatically switched at regular intervals instead of the button operation. Further, LEDs or the like of different colors may be turned on at a position visible from the subject's eye so as to recognize that the switching has been performed, or an explanation may be given to the subject using a voice guide.

<Application to other devices>
Further, in the above description, as the eye refractive power measuring device, an eye refractive power measuring device that objectively measures the eye refractive power of the eye to be inspected is exemplified, but the present invention is not limited to this. The present embodiment is also applicable to an eye refractive power measuring device that performs subjective measurement. The present embodiment is also applicable to a binocular open type optometry apparatus as disclosed in Japanese Patent Application Laid-Open No. 2018-38788.

Reference Signs List 1 eye refractive power measuring device 45 ring index projection optical system 48 illumination light source 50 observation optical system 80 control unit

Claims

An eye-refractive-power measuring device that measures the eye refractive power of the eye to be examined,
A measurement optical system for measuring the eye refractive power of the eye to be inspected,
An optotype presenting optical system that presents an optotype to the subject's eye via a correction optical system provided on the apparatus body side,
Control means for controlling the eye refractive power measurement device,
The control means includes:
An overref mode for measuring an overref value that is an eye refractive power in a wearing state using a refraction corrector,
By controlling the correction optical system and switching between a state corrected based on the over-reflection value and a non-correction state in which the correction optical system does not perform additional correction on the wearing state, A comparison mode for allowing an examiner to compare the appearance of the target,
Eye refractive power measuring device, characterized by performing the following.
The control means controls the correction optical system, and switches between a state in which the addition is added and a non-addition state in the wearing state, thereby allowing the subject to compare the appearance of the target. The eye refractive power measuring device according to claim 1, wherein the eye refractive power measuring device executes a comparison mode.
The eye refractive power measuring device according to claim 1 or 2, further comprising a power acquisition unit that acquires a correction instrument power that is a refractive power of the refraction correction instrument.
4. The eye refractive power measurement according to claim 3, wherein the control unit further switches to a virtual naked eye state in which the correction device power is offset by controlling the correction optical system in the comparison mode. apparatus.
The control means, based on the naked eye reflex value which is the eye refractive power measured in the naked eye state with the refractive correction device removed, the correction device frequency, and the overref value, based on the abnormality of the refractive correction device. The eye refractive power measuring device according to claim 3, wherein the eye refractive power is detected.
The method according to claim 5, wherein the control unit detects an abnormality of the refraction correction device based on a comparison result between the difference between the naked eye reflex value and the correction device frequency and the overreflex value. 7. Eye refractive power measuring device.
(7) The eye refractive power measuring device according to any one of (1) to (6), wherein the control unit determines whether the refraction correcting device has a light blocking function.
The eye refractive power measuring device according to claim 7, wherein the control means increases the light amount of the measurement optical system or the optotype presenting optical system when it is determined that the refraction correcting device has a light blocking function.