Optometry Equipment

Abstract

Provided is an optometric device for examining the optical properties of the eye of a subject to be examined, the optometric device being characterized by comprising a projection optical system which projects a visual mark beam toward the eye, a correction optical system which is disposed in an optical path of the projection optical system and changes the optical properties of the visual mark beam, an information acquisition means for acquiring power information for a refractive correction device worn by the subject, and a control means for controlling the correction optical system and performing additional correction for the eye while the refractive correction device is worn, wherein the control means calculates a prescription value for a new refractive correction device on the basis of the power information and a refraction error acquired by a subjective examination carried out at the time the additional correction was performed. This enables calculation of a more suitable prescription value for eyeglasses for a subject wearing a refractive correction device with an inappropriate power.

Description

[Technical field]

[0001] The present disclosure relates to an optometry apparatus that examines optical characteristics of a subject's eye. [Background technology]

[0002] There is known an eye examination device that measures the optical characteristics of a subject's eye by placing an optical element (e.g., a spherical lens, a cylindrical lens, etc.) in front of the subject's eye and presenting a visual target through this optical element (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-176893 Summary of the Invention

[0004] However, conventional optometric devices have not been able to measure how much additional power should be added to the refractive corrective device (such as glasses or contact lenses) currently worn by the subject.

[0005] In consideration of the problems with the conventional technology, the present disclosure has an objective of providing an optometry device that calculates more appropriate eyeglass prescription values ​​for a subject who wears a refractive correction device with an incorrect prescription.

[0006] In order to solve the above problems, the present disclosure is characterized by having the following configuration.

[0007] (1) An eye examination device for examining optical characteristics of a subject's eye, comprising: a light projection optical system that projects a visual target light beam toward the subject's eye; a correction optical system that is arranged in an optical path of the light projection optical system and changes the optical characteristics of the visual target light beam; an information acquisition means that acquires power information of a refractive corrective device worn by a subject; and a control means that controls the correction optical system and performs additional correction on the subject's eye while the refractive corrective device is being worn, wherein the control means calculates a prescription value for a new refractive corrective device based on a refractive error acquired by a subjective examination when the additional correction is performed and the power information. In this step, the prescription value is calculated by adding the refractive error and the power of the refractive corrector. It is characterized by:

[0008] According to the present disclosure, it is possible to calculate more appropriate eyeglass prescription values ​​for a subject who wears a refractive corrective device with an incorrect prescription. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an external view of an optometric apparatus. [Diagram 2] FIG. [Diagram 3] 1 is a schematic configuration diagram of the inside of an optometry apparatus as viewed from the front. [Figure 4] 2 is a schematic configuration diagram of the inside of the optometry apparatus as viewed from the side. FIG. [Diagram 5] 2 is a schematic configuration diagram of the inside of the optometry apparatus as viewed from above. FIG. [Figure 6] FIG. 2 is a diagram showing a control system of the optometric apparatus. [Figure 7] 4 is a flowchart showing a control operation of the optometric apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Embodiment> An optometry apparatus according to the present disclosure will be described below. The optometry apparatus (e.g., optometry apparatus 1) of this embodiment tests the optical characteristics of a subject's eye. The optometry apparatus includes, for example, a projection optical system (e.g., projection optical system 30), a correction optical system (e.g., correction optical system 60), an information acquisition unit (e.g., control unit 70), and a control unit (e.g., control unit 70).

[0011] <Projection optical system> The projection optical system projects a visual target light beam toward the subject's eye. The correction optical system is disposed in the optical path of the projection optical system and on the device body side, and changes the optical characteristics of the visual target light beam. The projection optical system may have a visual target presenting means for projecting the visual target light beam toward the subject's eye. For example, the visual target presenting means may be a display (for example, the display 31). The display may be LCOS (Liquid crystal on silicon), LCD (Liquid Crystal Display), organic EL (Electro Luminescence), or the like. In addition, for example, the visual target presenting means may be a light source and a DMD (Digital Micromirror Device), a visible light source for presenting a visual target, a visual target plate, or the like. The projection optical system may have at least one optical member for guiding the visual target light beam emitted from the visual target presenting means to the subject's eye.

[0012] In the present embodiment, the optometry apparatus does not necessarily have to include a light-projecting optical system, and may be configured to include a device including a light-projecting optical system separately from the optometry apparatus. In other words, the optometry apparatus may be configured to include at least a correction optical system, which will be described later.

[0013] <Correction optical system> The optometry apparatus includes, for example, a correction optical system. The correction optical system is disposed in the optical path of the light projection optical system and changes the optical characteristics of the visual target light beam. The optical characteristics of the visual target light beam may be at least one of the spherical power, cylindrical power, and cylinder axis angle of the visual target light beam.

[0014] The correction optical system may be configured to change the optical characteristics of the visual target light beam. For example, the correction optical system may be capable of changing the optical characteristics of the visual target light beam by controlling an 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, a variable focus lens, and the like. Of course, an optical element different from these optical elements may also be used.

[0015] Also, for example, the correction optical system may correct the spherical power of the subject's eye by optically changing the presentation position (presentation distance) of the optotype relative to the subject's eye. In this case, the optotype presenting unit may be configured to move in the optical axis direction in order to optically change the presentation position of the optotype. In this case, an optical element (e.g., a spherical lens, etc.) arranged in the optical path may be configured to move in the optical axis direction in order to optically change the presentation position of the optotype.

[0016] In addition, the corrective optical system may be configured by combining a configuration for controlling an optical element, a configuration for moving the optotype presenting unit in the optical axis direction, and a configuration for moving an optical element arranged in the optical path in the optical axis direction.

[0017] In addition, in this embodiment, the correction optical system may be configured to change the optical characteristics of the visual target light beam by controlling an optical element disposed between the visual target presenting means of the light projection optical system and an optical member for guiding the visual target light beam emitted from the visual target presenting unit to the subject's eye. That is, the correction optical system may be configured as a phantom lens refractometer (phantom correction optical system). In this case, the visual target light beam corrected by the correction optical system is guided to the subject's eye via the optical member.

[0018] <Information acquisition section> The information acquisition unit acquires power information of the refractive corrective device currently worn by the subject. The information acquisition unit acquires the power of the refractive corrective device measured by a power measuring device such as a lens meter. Note that the information does not necessarily have to be a lens meter value. For example, the information may be prescription data of the previous glasses. The refractive corrective device is, for example, glasses or contact lenses. Note that the information acquisition unit may acquire the distance between the optical axes of the glasses.

[0019] <Control Unit> The control unit controls the correction optical system and performs additional correction on the examinee's eye while the refractive corrective device is being worn. The control unit calculates the prescription value of a new refractive corrective device based on the refractive error acquired by performing additional correction in the subjective examination and the power information acquired by the information acquisition unit. In other words, the optometry device of this embodiment can easily acquire how much power needs to be added to the refractive corrective device worn by the examinee. In other words, the optometry device can acquire the prescription value of an appropriate refractive corrective device based on the current refractive corrective device. In addition, the examinee can be made aware of the need for a new refractive corrective device.

[0020] In addition, by calculating the refractive error from the test results using the refractive corrective device that is actually worn, it is possible to prescribe a new refractive corrective device based on a state that is closer to the actual vision.

[0021] The control unit may calculate the prescription value by adding the refractive error and the power of the refractive corrector. The power information acquired by the information acquisition unit may include, for example, the spherical power, cylindrical power, and cylindrical axis of the refractive corrector. The refractive error may also include a spherical power error (error in spherical power), a cylindrical power error (error in cylindrical power), and a cylindrical axis error (error in cylindrical axis). In this case, the control unit may calculate a new prescription value of the refractive corrector by adding the spherical power error, cylindrical power error, and cylindrical axis error to the spherical power, cylindrical power, and cylindrical axis.

[0022] The control unit may correct the value of the pupil diameter of the subject's eye based on the power information of the refractive corrector acquired by the information acquisition unit. For example, since the magnification differs depending on the power of the refractive corrector (for example, when the negative power is large, the pupil appears to be reduced), the value of the pupil diameter may be corrected by the amount of this magnification when calculating the pupil diameter.

[0023] The control unit may output information (fitting information) for changing the fitting of the glasses in the VD (corneal vertex distance) direction based on the subjective test result. For example, if the subjective test is performed while wearing glasses with an appropriate lens power, but the vision of the subject's eye is not good, the control unit may notify the examiner to change the VD by fitting the glasses.

[0024] In addition, when the refractive corrective device is glasses having an anterior inclination angle and a curvature angle that are adapted to the subject, the control unit may perform additional correction on the subject's eye while wearing the glasses. As a result, compared to performing the test with the naked eye, performing the test with the actual anterior inclination angle or curvature angle makes it possible to obtain a more appropriate prescription value with fewer errors in the cylindrical power and the cylindrical axis.

[0025] The eye examination apparatus may further include an image acquisition unit (e.g., the imaging optical system 100) that acquires an image of the face including the anterior segment of the eye to be examined. In this case, the information acquisition unit may acquire the inter-axial distance of glasses, which is a refractive correction device, and the control unit may detect the difference between the inter-axial distance of the subject calculated based on the image acquired by the image acquisition unit and the inter-axial distance of the glasses. Based on this difference, the control unit may determine whether the inter-axial distance of the glasses is appropriate for the inter-axial distance of the subject.

[0026] In another embodiment, the optometry apparatus may include an imaging unit (e.g., the observation optical system 50), an information acquisition unit, and a control unit. For example, the optometry apparatus does not necessarily have to include a light projection optical system and a correction optical system. The imaging unit, for example, acquires an anterior eye image by photographing the subject's eye. The control unit may correct the pupil diameter value of the subject's eye acquired based on the anterior eye image based on the diopter information. This allows the optometry apparatus to acquire a more accurate pupil diameter.

[0027] In another embodiment, the eye examination apparatus may include an image acquisition unit, an information acquisition unit, and a control unit. For example, the eye examination apparatus does not necessarily include a light projection optical system and a correction optical system. The image acquisition unit, for example, acquires an image of a face including an anterior segment of the subject's eye. The information acquisition unit acquires the inter-axial distance of the eyeglasses worn by the subject. The control unit may detect the difference between the inter-axial distance of the subject acquired based on the image and the inter-axial distance. The control unit may determine whether the eyeglasses are appropriate, for example, based on the detection result.

[0028] The optometry apparatus in this embodiment examines optical characteristics of the subject's eye. The optical characteristics of the subject's eye may be at least any one of the following: ocular refraction of the subject's eye (e.g., spherical power, cylindrical power, astigmatism axis angle of the subject's eye, etc.), contrast sensitivity, binocular vision function (e.g., amount of heterophoria, stereoscopic vision function, etc.), etc.

[0029] <Example> An example of a typical embodiment will be described below.

[0030] FIG. 1 is an external view of an 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 imaging optical system 100, and the like. The housing 2 is fixed to the base 6. A measurement unit 7, which will be described later, is provided inside the housing 2. The presentation window 3 is used to present a visual target to the subject's eye (the subject's eye E). The monitor 4 displays the measurement results of the optical characteristics of the subject's eye E, and the like. 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 provided separately. In this case, at least one of a mouse, a joystick, a keyboard, a mobile terminal, and the like may be used as the operation unit. A signal corresponding to an operation instruction input from the monitor 4 is output to a control unit 70, which will be described later. The chin rest 5 is fixed to the base 6. The chin rest 5 is used to keep the distance between the subject's eye E and the optometry apparatus 1 constant. The chin rest 5 is not limited to this, and a forehead rest, face rest, or the like may be used to keep the distance between the subject's eye E and the optometry apparatus 1 constant.

[0031] The imaging optical system 100 is used to capture an image of the face including the anterior eye of a subject. The imaging optical system 100 is composed of an imaging element and a lens, not shown. The imaging optical system 100 captures an image of the face including at least one of the left eye EL and the right eye ER of the subject's eye E, and obtains an image of the face. The imaging of the face by the imaging optical system 100 is controlled by the control unit 70, which will be described later. In addition, the face image acquired by the imaging optical system 100 is analyzed by the control unit 70, which will be described later.

[0032] <Measurement part> The visual target light beam from the measurement unit 7 is guided to the test eye E through the presentation window 3. The measurement unit 7 includes a left eye measurement unit 7L and a right eye measurement unit 7R. The measurement unit 7 has a pair of left and right subjective test units, which will be described later, and a pair of left and right objective test units, which will be described later. In this embodiment, the left eye measurement unit 7L and the right eye measurement unit 7R are made of the same material. Of course, the left eye measurement unit 7L and the right eye measurement unit 7R may be made of at least a part of different materials.

[0033] Fig. 2 is a diagram showing the measurement unit 7. In Fig. 2, the measurement unit 7 for the left eye 7L is taken as an example of the measurement unit 7. The measurement unit 7R for the right eye is omitted because it has the same configuration as the measurement unit 7L for the left eye. For example, the measurement unit 7L for the left eye includes a subjective test optical system 25, an objective test optical system 10, a first target projection optical system 45, a second target projection optical system 46, an observation optical system 50, and the like.

[0034] <Subjective inspection optical system> The subjective test optical system 25 is used as part of the subjective test section that subjectively measures the optical characteristics of the subject's eye E (details will be described later). In this embodiment, a subjective test section that measures the ocular refractive power of the subject's eye E is taken as an example of the optical characteristics of the subject's eye E. The optical characteristics of the subject's eye E may be contrast sensitivity, binocular vision function (e.g., amount of heterophoria, stereoscopic vision function, etc.), etc., in addition to ocular refractive power. For example, the subjective test optical system 25 is composed of a light projection optical system (target projection system) 30, a correction optical system 60, and a correction optical system 90.

[0035] <Projection optical system> The light projection optical system 30 projects a visual target light beam toward the subject's eye E. For example, the light projection optical system 30 includes a display 31, a light projection lens 33, a light projection lens 34, a reflecting mirror 36, a dichroic mirror 35, a dichroic mirror 29, an objective lens 14, and the like.

[0036] A visual target (fixation target, test visual target, etc.) is displayed on the display 31. A visual target light beam emitted from the display 31 is projected onto the subject's eye E via optical members in the following order: a projector lens 33, a projector lens 34, a reflecting mirror 36, a dichroic mirror 35, a dichroic mirror 29, and an objective lens 14.

[0037] <Correction optical system> The correction optical system 60 is disposed in the optical path of the light projection optical system 30. The correction optical system 60 changes the optical characteristics of the visual target light beam 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.

[0038] The astigmatism correcting optical system 63 is used to correct the cylindrical power and astigmatism axis angle of the subject's eye E. The astigmatism correcting optical system 63 is disposed between the projector lens 33 and the projector lens 34. The astigmatism correcting optical system 63 is composed of two positive cylindrical lenses 61a and 61b having the same focal length. The cylindrical lenses 61a and 61b are rotated independently about the optical axis L2 by driving the rotation mechanisms 62a and 62b. In this embodiment, the astigmatism correcting optical system 63 is described using the cylindrical lenses 61a and 61b as an example, but is not limited thereto. The astigmatism correcting optical system 63 may be configured to correct the cylindrical power, the astigmatism axis angle, and the like. As an example, a corrective lens may be inserted and removed from the optical path of the projection optical system 30.

[0039] The driving mechanism 39 is composed of a motor and a slide mechanism. The driving mechanism 39 moves the display 31 in the optical axis L2 direction by moving a driving unit 95 described later in the optical axis L2 direction. In the objective test, the display 31 can be moved to fog the subject's eye E. In the subjective test, the display 31 can be moved to optically change the presentation position (presentation distance) of the optotype with respect to the subject's eye E, and the spherical power of the subject's eye E can be corrected. That is, in this embodiment, a spherical correction optical system that corrects the spherical power of the subject's eye E is configured by changing the position of the display 31. Note that the configuration of the spherical correction optical system may be different from that of this embodiment. For example, the spherical power may be corrected by arranging a number of optical elements in the optical path. Also, for example, the spherical power may be corrected by arranging a lens in the optical path and moving the lens in the optical axis direction.

[0040] In this embodiment, a correction optical system that corrects spherical power, cylindrical power, and astigmatism axis angle is exemplified. However, the correction optical system may correct other optical characteristics (e.g., prism value, etc.). By correcting the prism value, the visual target light beam is appropriately projected onto the subject's eye even if the subject's eye is a strabismus eye.

[0041] In this embodiment, the astigmatism correction optical system 63 for correcting the cylindrical power and the cylindrical axis angle, and the drive mechanism 39 for correcting the spherical power are provided separately. However, the spherical power, the cylindrical power, and the cylindrical axis angle may be corrected by the same configuration. For example, the spherical power, the cylindrical power, and the cylindrical axis angle may be corrected by an optical system that modulates the wavefront. Also, a lens disk on which a plurality of optical elements (for example, at least one of a spherical lens, a cylindrical lens, and a dispersion prism) are arranged on the same circumference, and an actuator that rotates the lens disk may be used as the correction optical system. In this case, the lens disk is rotated to switch the optical elements located on the optical axis L2, thereby correcting various optical characteristics. Also, the optical elements (for example, at least one of a cylindrical lens, a cross cylinder lens, and a rotary prism) arranged on the optical axis L2 may be rotated by the actuator.

[0042] <Correction optical system> The correction optical system 90 is disposed between the objective lens 14 and a deflection mirror 81 (described later). The correction optical system 90 is used to correct optical aberrations (e.g., astigmatism, etc.) occurring in a subjective examination. The correction optical system 90 corrects astigmatism by adjusting the cylindrical power and the astigmatism axis angle. The correction optical system 90 is composed of two positive cylindrical lenses 91a and 91b having the same focal length. The cylindrical lenses 91a and 91b are rotated independently about the optical axis L3 by driving the rotation mechanisms 92a and 92b. In this embodiment, the correction optical system 90 is described using a configuration in which two positive cylindrical lenses 91a and 91b are used as the center, but is not limited to this. The correction optical system 90 may be configured to correct astigmatism. For example, in this case, the correction lens may be inserted and removed from the optical axis L3.

[0043] <Objective inspection optical system> The objective examination optical system 10 is used as part of the configuration of an objective examination unit that objectively measures the optical characteristics of the subject's eye (details will be described later). In this embodiment, an objective examination unit that measures the ocular refractive power of the subject's eye E will be described as an example of the optical characteristics of the subject's eye E. Note that the optical characteristics of the subject's eye E may be axial length, corneal shape, etc. in addition to ocular refractive power. For example, the objective examination optical system 10 is composed of a projection optical system 10a, a light receiving optical system 10b, and a correction optical system 90.

[0044] The projection optical system (light projection optical system) 10a projects a spot-shaped measurement index onto the fundus of the subject's eye E through the center of the pupil of the subject's eye E. 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.

[0045] The light source 11 emits a measurement light beam. The light source 11 is conjugate with the fundus of the eye E. The hole of the hole mirror 13 is conjugate with the pupil of the eye E. The prism 15 is a light beam deflecting member. The prism 15 is disposed at a position that is not conjugate with the pupil of the eye E, and the measurement light beam passing through the prism 15 is decentered with respect to the optical axis L1. The prism 15 is driven to rotate around the optical axis L1 by a driving unit (motor) 23. The dichroic mirror 35 shares the optical path of the objective test optical system 10 with the optical path of the subjective test optical system 25 described later. That is, the dichroic mirror 35 makes the optical axis L1 of the objective test optical system 10 and the optical axis L2 of the subjective test optical system 25 coaxial with each other. 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 test optical system 25 and guides them to the eye E to be examined.

[0046] The light receiving optical system 10b extracts the fundus reflected light beam reflected by the fundus of the subject's eye E in a ring shape through the pupil periphery of the subject's eye E. 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 aperture 18, a collimator lens 19, a ring lens 20, an image sensor 22, and the like. The ring lens 20 is composed of a lens portion formed in a ring shape and a light shielding portion in which a light shielding coating is applied to an area other than the lens portion. The ring lens 20 is in an optically conjugate positional relationship with the pupil of the subject's eye E. The light receiving aperture 18 and the image sensor 22 are in a conjugate relationship with the fundus of the subject's eye E. The output from the image sensor 22 is input to the control unit 70.

[0047] In this embodiment, the light source 11 included in the projection optical system 10a, the light receiving diaphragm 18, collimator lens 19, ring lens 20, and image sensor 22 included in the light receiving optical system 10b, and the display 31 included in the light projection optical system 30 can be moved integrally in the optical axis direction by a drive mechanism 39. In other words, the light source 11, the light receiving diaphragm 18, the collimator lens 19, the ring lens 20, the image sensor 22, and the display 31 are synchronized as a drive unit 95, and the drive mechanism 39 moves them integrally. For example, the position to which the drive mechanism 39 has moved is detected by a potentiometer (not shown).

[0048] The drive unit 95 moves a part of the objective examination optical system 10 in the optical axis direction so that the outer ring light beam is incident on the image sensor 22 in each meridian direction. That is, by moving a part of the objective examination optical system 10 in the optical axis L1 direction according to the spherical refractive error (spherical refractive power) of the subject's eye E, the spherical refractive error is corrected and the light source 11, the light receiving aperture 18, and the image sensor 22 are optically conjugate with the fundus of the subject's eye E. Note that the hole mirror 13 and the ring lens 20 are arranged so as to be conjugate with the pupil of the subject's eye E at a constant magnification, regardless of the amount of movement of the drive unit 95.

[0049] 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 to form a spot-shaped point light source image on the fundus of the subject's eye E. At this time, the pupil projection image (projected light beam on the pupil) of the hole part of the hole mirror 13 is rotated eccentrically at high speed by the prism 15 rotating around the optical axis. The point light source image projected on the fundus is reflected and scattered, exits the subject's eye E, and is collected by the objective lens 14. The light is collected again at the position of the light receiving diaphragm 18 via the dichroic mirror 29, the dichroic mirror 35, the prism 15 rotating at high speed, the hole mirror 13, the relay lens 16, and the mirror 17, and a ring-shaped image is formed on the image sensor 22 by the collimator lens 19 and the ring lens 20.

[0050] For example, the prism 15 is disposed on a common optical path of the projection optical system 10a and the light receiving optical system 10b. For example, the reflected light beam from the fundus passes through the same prism 15 as the projection optical system 10a, so that the subsequent optical systems perform reverse scanning as if there was no decentering of the projection light beam and the reflected light beam (received light beam) on the pupil.

[0051] In this embodiment, the configuration of the objective examination unit can be changed. For example, the objective examination unit may be configured to project a ring-shaped measurement index from the peripheral part of the pupil onto the fundus, extract fundus reflection light from the center of the pupil, and receive the ring-shaped fundus reflection image on the image sensor 22. The objective examination unit may also be configured to include a Shack-Hartmann sensor, or may be configured to include a phase difference method that projects a slit.

[0052] <First target projection optical system and second target projection optical system> For example, in this embodiment, the first index projection optical system 45 and the second index projection optical system 46 are disposed between the correction optical system 90 and the deflection mirror 81. Of course, the 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 provided on the cover of the housing 2. In this case, for example, the first index projection optical system 45 and the second index projection optical system 46 may be configured to be disposed around the presentation window 3.

[0053] 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 an alignment index on the cornea of ​​the subject's eye E. 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. For convenience, FIG. 2 illustrates 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. In this embodiment, the first index projection optical system 45 projects an alignment index at infinity on the cornea of ​​the subject's eye. The second index projection optical system 46 projects an alignment index at finite distance on 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 imaging the anterior segment of the subject's eye by the observation optical system 50. Furthermore, the light sources of the first index projecting optical system 45 and the second index projecting optical system 46 are not limited to ring-shaped light sources, and may be a plurality of point-shaped light sources, a line-shaped light source, or the like.

[0054] <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, etc. The dichroic mirror 29 transmits the anterior segment observation light and the alignment light. The imaging element 52 has an imaging surface arranged at a position substantially conjugate with the anterior segment of the subject's eye E. The output from the imaging element 52 is input to the control unit 70. As a result, an anterior segment image of the subject's eye E is captured by the imaging element 52 and displayed on the monitor 4. The observation optical system 50 also serves as an optical system for detecting an alignment index image formed on the cornea of ​​the subject's eye E by the first index projecting optical system 45 and the second index projecting optical system 46, and the position of the alignment index image is detected by the control unit 70.

[0055] <Internal structure of optometry device> The internal configuration of the optometry apparatus 1 will be described below. Fig. 3 is a schematic diagram of the inside of the optometry apparatus 1 according to this embodiment as viewed from the front (direction A in Fig. 1). Fig. 4 is a schematic diagram of the inside of the optometry apparatus 1 according to this embodiment as viewed from the side (direction B in Fig. 1). Fig. 5 is a schematic diagram of the inside of the optometry apparatus 1 according to this embodiment as viewed from above (direction C in Fig. 1). For ease of explanation, Figs. 4 and 5 only show the optical axis of the left eye measurement unit 7L.

[0056] For example, the optometry device 1 includes a subjective test section and an objective test section. For example, in the subjective test section and the objective test section, the visual target light beam from the measurement section 7 may be guided to the subject's eye E through an optical path that coincides with the optical axis L of an optical member (for example, a concave mirror 85 described later). Also, for example, in the subjective test section and the objective test section, the visual target light beam from the measurement section 7 may be guided to the subject's eye E through an optical path that deviates from the optical axis L of an optical member (for example, a concave mirror 85 described later). For example, in this embodiment, the optical axis L is an axis toward the center of the sphere of the concave mirror 85. Note that, hereinafter, an example of a configuration in which the visual target light beam from the measurement section 7 passes through a path that deviates from the optical axis L of the concave mirror 85 is given. That is, the visual target light beam from the measurement section 7 is irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85, and the reflected light beam is guided to the subject's eye E.

[0057] For example, the subjective test unit is composed of 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 test unit is not limited to this configuration. For example, the configuration may not have the reflection mirror 84. In this case, the visual target light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. In addition, for example, the configuration may have a half mirror. In this case, the visual target light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 through the half mirror, and the reflected light beam may be guided to the subject's eye E. In this embodiment, the concave mirror 85 is disposed, but a convex lens may be disposed instead of the concave mirror 85.

[0058] For example, the objective test unit is composed of the measurement unit 7, the deflection mirror 81, the reflection mirror 84, and the concave mirror 85. The objective test unit is not limited to this configuration. For example, the configuration may not have the reflection mirror 84. In this case, the visual target light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 after passing through the deflection mirror 81. Also, for example, the configuration may have a half mirror. In this case, the visual target light beam from the measurement unit 7 may be irradiated from an oblique direction with respect to the optical axis L of the concave mirror 85 through the half mirror, and the reflected light beam may be guided to the subject's eye E. In this embodiment, the concave mirror 85 is disposed, but the configuration may be such that a convex lens is disposed instead of the concave mirror 85.

[0059] For example, the optometry device 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 measurement unit 7L and the right eye measurement unit 7R, the distance between the deflection mirror 81 and the measurement unit 7 is changed, and the presentation position of the visual target light beam in the Z direction is changed. This allows the visual target light beam corrected by the correction optical system 60 to be guided to the subject's eye E, and the measurement unit 7 to be adjusted in the Z direction so that the image of the visual target light beam corrected by the correction optical system 60 is formed on the fundus of the subject's eye E.

[0060] For example, the deflection mirror 81 has a right-eye deflection mirror 81R and a left-eye deflection mirror 81L, which are provided in a pair on the left and right sides. For example, the deflection mirror 81 is disposed between the correction optical system 60 and the subject's eye E. That is, the correction optical system 60 in this embodiment has a left-eye corrective optical system and a right-eye corrective optical system, which are provided in a pair on the left and right sides, and the left-eye deflection mirror 81L is disposed between the left-eye corrective optical system and the left subject's eye EL, and the right-eye deflection mirror 81R is disposed between the right-eye corrective optical system and the right subject's eye ER. For example, the deflection mirror 81 is preferably disposed at a conjugate position of the pupil.

[0061] 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 test eye EL. Also, for example, the left-eye deflection mirror 81L reflects the reflected light reflected by the left test eye EL and guides it 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 test eye ER. Also, for example, the right-eye deflection mirror 81R reflects the reflected light reflected by the right test eye ER and guides it to the right-eye measurement unit 7R. Note that, in this embodiment, a configuration using the deflection mirror 81 as a deflection member that reflects the light beam projected from the measurement unit 7 and guides it to the test eye E is described as an example, but is not limited to this. The deflection member may be any deflection member that reflects the light beam projected from the measurement unit 7 and guides it to the test eye E. For example, the deflection member may be a prism or a lens.

[0062] For example, the drive mechanism 82 is composed of a motor (drive unit) and the like. For example, the drive mechanism 82 has a drive mechanism 82L for driving the deflection mirror 81L for the left eye and a drive mechanism 82R for driving the deflection mirror 81R for the right eye. For example, the deflection mirror 81 is rotated by the drive of the drive mechanism 82. 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. Note that the rotation of the deflection mirror 81 may be either the horizontal direction or the vertical direction.

[0063] For example, the driving unit 83 is composed of a motor or the like. For example, the driving unit 83 has a driving unit 83L for driving the deflection mirror 81L for the left eye and a driving unit 83R for driving the deflection mirror 81R for the right eye. For example, the deflection mirror 81 moves in the X direction by driving the driving unit 83. For example, the deflection mirror 81 moves the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye, changing the distance between the deflection mirror 81L for the left eye and the deflection mirror 81R for the right eye, and 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 the subject's eye E.

[0064] For example, a plurality of deflection mirrors 81 may be provided in each of the optical path for the left eye and the optical path for the right eye. For example, two deflection mirrors may be provided in each of the optical path for the left eye and the optical path for the right eye (for example, two deflection mirrors in the optical path for the left eye). 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 deflection mirror 81 is rotated to deflect the apparent light beam for forming an image of the correction optical system 60 in front of the subject's eye, thereby optically correcting the formation position of the image.

[0065] For example, the concave mirror 85 is shared by the right eye measurement unit 7R and the left eye measurement unit 7L. For example, the concave mirror 85 is shared by 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. That is, the concave mirror 85 is disposed at a position where it 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 does not have to 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 visual target light beam that has passed through the correction optical system to the subject's eye E, and forms an image of the visual target light beam that has passed through the correction optical system in front of the subject's eye E. In this 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, the optical member can be a lens or a flat mirror.

[0066] For example, the concave mirror 85 is used for both the subjective test section and the objective test section. For example, the visual target light beam projected from the subjective test optical system 25 is projected onto the test eye E via the concave mirror 85. For example, the measurement light projected from the objective test optical system 10 is projected onto the test eye E via the concave mirror 85. Also, for example, the reflected light of the measurement light projected from the objective test optical system 10 is guided to the light receiving optical system 10b of the objective test optical system 10 via the concave mirror 85. Note that, in this embodiment, the configuration in which the reflected light of the measurement light by the objective test optical system 10 is guided to the light receiving optical system 10b of the objective test optical system 10 via the concave mirror 85 is exemplified, but is not limited to this. For example, the reflected light of the measurement light by the objective test optical system 10 may be configured not to pass through the concave mirror 85.

[0067] More specifically, for example, in this embodiment, the optical axis from the concave mirror 85 in the subjective test section to the subject's eye E and the optical axis from the concave mirror 85 in the objective test section to the subject's eye E are at least coaxial. For example, in this embodiment, the optical axis L2 of the subjective test optical system 25 and the optical axis L1 of the objective test optical system 10 are synthesized by the dichroic mirror 35 to be coaxial.

[0068] <Optical path of subjective inspection area> The optical path of the subjective test unit will be described below. For example, the subjective test unit guides the visual target light beam to the subject's eye E by reflecting the visual target light beam passing through the correction optical system 60 toward the subject's eye by the concave mirror 85, and forms an image of the visual target light beam passing through the correction optical system 60 in front of the subject's eye E at a predetermined test distance. For example, at this time, the visual target light beam passing through the correction optical system 60 passes through an optical path off the optical axis L of the concave mirror 85, enters the concave mirror 85, is reflected so as to pass through an optical path off the optical axis L of the concave mirror 85, and is guided to the subject's eye E. For example, the visual target seen by the subject appears to be farther away than the actual distance from the subject's eye E to the display 31. That is, the concave mirror 85 is used to extend the presentation distance of the visual target to the subject's eye E, and the visual target can be presented to the subject so that the image of the visual target light beam is visible at a predetermined test distance.

[0069] A more detailed description will be given. In the following description, the optical path for the left eye will be taken 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 visual target light beam projected from the display 31 of the measurement unit for the left eye 7L enters the astigmatism correction optical system 63 via the projection lens 33. The visual target light beam 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 visual target light beam that has passed through the correction optical system 90 is guided from the measurement unit for the left eye 7L toward the deflection mirror 81L for the left eye. The visual target light beam that is emitted from the measurement unit for the left eye 7L and reflected by the deflection mirror 81 for the left eye is reflected by the reflection mirror 84 toward the concave mirror 85. For example, the visual target light beam emitted from the display 31 reaches the left test eye EL by passing through the optical members in this way.

[0070] As a result, a visual target corrected by the correction optical system 60 is formed on the fundus of the left test eye EL based on the eyeglasses wearing position of the left test eye EL (for example, about 12 mm from the corneal apex position). Therefore, it is equivalent to placing the astigmatism correction optical system 63 in front of the eye and adjusting the spherical power by the spherical power correction optical system (in this embodiment, driving the drive mechanism 39) in front of the eye, and the subject can collimate the image of the visual target in a natural state through the concave mirror 85. In this embodiment, the optical path for the right eye has the same configuration as the optical path for the left eye, and visual targets corrected by the pair of right and left correction optical systems 60 are formed on the fundus of both test eyes based on the eyeglasses wearing positions of the left test eye EL and the right test eye ER (for example, about 12 mm from the corneal apex position). In this way, the subject responds to the examiner while looking directly at the target in a state of natural vision, and attempts correction using the corrective optical system 60 until the target appears correct, and then subjectively measures the optical characteristics of the subject's eye based on the correction value.

[0071] <Optical path for objective examination section> Next, the optical path of the objective test section will be described. In the following description, the optical path for the left eye will be taken 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 section for the left eye, the measurement light emitted from the light source 11 of the projection optical system 10a in the objective test optical system 10 enters the correction optical system 90 via the relay lens 12 to the objective lens 14. The measurement light that passes through the correction optical system 90 is projected from the measurement section for the left eye 7L toward the deflection mirror 81L for the left eye. The measurement light emitted from the measurement section for the left eye 7L and reflected by the deflection mirror 81 for the left eye 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 to reach the left test eye EL, and forms a spot-shaped point light source image on the fundus of the left test eye EL. At this time, the pupil projection image (light beam projected onto the pupil) of the hole part of the hole mirror 13 is eccentrically rotated at high speed by the prism 15 rotating around the optical axis.

[0072] The light of the point light source image formed on the fundus of the left eye EL is reflected and scattered, exits the eye E, passes through the optical path that the measurement light passed through, is collected by the objective lens 14, and passes through the dichroic mirror 29, the dichroic mirror 35, the prism 15, the hole mirror 13, the relay lens 16, and the mirror 17. The reflected light that passes through the mirror 17 is collected again on the opening of the light receiving diaphragm 18, is made into a substantially parallel beam (in the case of an emmetropic eye) by the collimator lens 19, is extracted as a ring-shaped beam by the ring lens 20, and is received as a ring image by the image sensor 22. The optical characteristics of the eye E can be objectively measured by analyzing the received ring image.

[0073] <Control Unit> 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, non-volatile memory 75 (hereinafter, memory 75), light source 11, image sensor 22, display 31, image sensor 52, and lens meter LM provided in the measurement unit 7. In addition, for example, the control unit 70 is electrically connected to drive units (not shown) provided in the drive unit 9, drive mechanism 39, rotation mechanisms 62a and 62b, drive unit 83, and rotation mechanisms 92a and 92b.

[0074] For example, the control unit 70 includes a CPU (processor), a RAM, a ROM, etc. For example, the CPU controls each component 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, optotype data for various tests, initial values, etc. The control unit 70 may be composed of multiple control units (i.e., multiple processors).

[0075] For example, the memory 75 is a non-transient storage medium that can retain the stored contents even if the power supply is cut off. For example, a hard disk drive, a flash ROM, a USB memory, etc. can be used as the memory 75. For example, the memory 75 stores a control program for controlling the subjective testing unit and the objective testing unit.

[0076] <Control action> The control operation of the optometry apparatus 1 will be described together with the examination procedure with reference to FIG.

[0077] (S1: Front eyeglass power measurement) When performing a subjective examination with the optometry apparatus 1, the examiner measures the power of the examinee's front spectacles (the spectacles currently worn) using a power measuring device such as a lensmeter LM. The lensmeter LM acquires the spherical power, cylindrical power, and cylindrical axis of the spectacles lenses. The lensmeter LM can also acquire the optical axis distance of the spectacles. The lensmeter LM can also measure contact lenses. For example, the control unit 70 acquires the power and optical axis distance of the front spectacles from the lensmeter LM. In this way, the control unit 70 functions as an information acquisition unit that acquires power information of the refractive corrector. The spectacles power may be measured before or after the examination with the optometry apparatus 1. The control unit 70 acquires the power information of the front spectacles at any timing after the spectacles power is measured by the lensmeter LM.

[0078] (S2: Wearing awareness test) Next, a subjective test is performed on the subject's eye E in a state where the front spectacles are worn (wearing state). The examiner presents a fixation target to the subject's eye E and projects an alignment index image onto the cornea of ​​the subject's eye E to complete the alignment between the subject's eye E and the measurement unit 7. When the alignment is completed, the control unit 70 displays the test target on the display 31 in response to the examiner's operation, and projects the test target onto the subject's eye E.

[0079] For example, the examiner asks the subject about the orientation of the test target displayed (e.g., the orientation of the gaps in the Landolt ring target) and, taking the subject's answer into consideration, checks whether the additional correction power for additionally correcting the subject's eye E in the wearing state is appropriate. If the subject's answer is incorrect and the additional correction power is inappropriate, the power is changed and it is checked again to see if it is appropriate.

[0080] The control unit 70 controls at least one of the light projection optical system 30 and the correction optical system 60 in the subjective test optical system 25 in response to the operation signal, and additionally corrects the ocular refraction of the subject's eye E in the wearing state to a predetermined diopter value (e.g., 0D, etc.). For example, the control unit 70 may move the display 31 in the direction of the optical axis L2 to correct the spherical power of the subject's eye E, or may rotate the cylindrical lenses 61a and 61b around the optical axis L2 to correct at least one of the cylindrical power and the astigmatism axis angle of the subject's eye E.

[0081] The examiner repeatedly changes the additional correction power and checks how the subject sees the image. As a result, the ocular refraction of the subject's eye E in the wearing state is additionally corrected to a predetermined diopter value, and the additional correction power at that time (i.e., the refractive error) is obtained.

[0082] Note that an objective test may be performed before the subjective test. For example, the control unit 70 may obtain the optical characteristics (i.e., the over-refractive value) of the subject's eye E in the wearing state by an objective test of the objective test optical system 10. In this case, the control unit 70 may additionally correct the subject's eye E in the wearing state before the subjective test based on the over-refractive value.

[0083] (S3: Calculate eyeglass prescription value) When the refractive error in the wearing state is acquired by the subjective wear test, the control unit 70 calculates the appropriate eyeglass prescription value based on the refractive error and the eyeglass power acquired by the lens meter LM. For example, if the power of the front eyeglasses is S(lens), C(lens), and A(lens), it can be expressed by separating it into three components of Jackson cross cylinder using the sin component, cos component, and equivalent spherical power as shown in the following formula (1).

number

[0084] Here, M(lens) is the spherical equivalent power, J45(lens) is the astigmatism power in the 45-degree diagonal direction, and J180(lens) is the astigmatism power in the horizontal and vertical directions. Similarly, if the powers measured in the wearing state with the optometry device 1 are S(o-ref), C(o-ref), and A(o-ref), they can be expressed as the following formula (2).

number

[0085] In this case, the parameters of the more suitable eyeglasses power (S(optim), C(optim), A(optim)) are the sum of equations (1) and (2), and can be expressed as the following equation (3).

number

[0086] From equation (3), the prescription value of the new glasses can be expressed as the following equation (4).

number

[0087] The control unit 70 calculates the prescription value of the new glasses by the above formula and outputs the prescription value. For example, the control unit 70 may display the prescription value on the monitor 4, may print the prescription value by a printer, or may transmit the prescription value to an external device. The examiner creates new glasses based on the output prescription value.

[0088] As described above, the optometry device 1 of this embodiment can easily obtain how much additional power should be added to the front glasses by performing a subjective test on the subject while wearing the front glasses. In addition, a more appropriate prescription value for glasses can be calculated using the subjective test result while wearing the glasses and the power of the front glasses. By performing the test while wearing the front glasses, the difference in vision between the time of the test and when wearing the newly prescribed glasses is less likely to occur compared to the conventional case of performing the test with the naked eye, and the discomfort felt by the subject can be reduced. In addition, if the vision improves due to additional correction while wearing the front glasses, the subject can recognize the need for new glasses.

[0089] As in the above embodiment, the range of diopters that can be examined can be expanded by performing a subjective examination while wearing a refractive corrective device. For example, if the measurement range of S value is -15 to +15D, a subject with a diopter of -20D cannot be examined with the naked eye. However, if the examination is performed while wearing a refractive corrective device of -10D, the measurement range is substantially -25D to +5D, so that even a subject with a diopter of -20D can be examined. This is also true for C value.

[0090] In addition, because the power of the optotype can be changed inside the device as in this embodiment, there is no need to physically add an optical element to the eyeglass lens to change the refractive power. This reduces deviations in VD (corneal vertex distance), etc., and allows for subjective testing with a view closer to that of real eyeglasses.

[0091] In general, glasses have a forward tilt angle and a warp angle. The forward tilt angle is, for example, the angle of the glasses lens surface relative to the vertical direction. The warp angle is, for example, the angle of the glasses lens surface relative to the horizontal direction along the bridge of the glasses. The forward tilt angle and the warp angle may change the cylindrical power and the cylindrical axis, which is particularly noticeable in glasses with a large power. For example, when using a device (so-called refractor) that switches and places optical elements in front of the eyes of a subject in a naked eye state to perform a subjective test, the measurement is performed in a state without the forward tilt angle and the warp angle, so that the appearance may differ from that when the actual glasses are made. In the eye examination device of this embodiment, the glasses prescription value is determined based on the subjective test result in a wearing state under the influence of the forward tilt angle and the warp angle, so that glasses that take into account the appearance when there is a forward tilt angle and a warp angle can be provided compared to the case of testing with the naked eye.

[0092] The optometry apparatus 1 may measure the pupil diameter of the subject's eye E. For example, the optometry apparatus 1 may acquire the pupil diameter by analyzing an anterior eye image of the subject's eye E captured by the observation optical system 50. For example, the control unit 70 may acquire the pupil diameter based on the luminance distribution of the anterior eye image.

[0093] In addition, when measuring the pupil diameter, the size of the pupil diameter is enlarged or reduced depending on the power of the eyeglass lenses when the eyeglasses are worn. For example, when a lens with a negative power is inserted, the pupil diameter on the image is small, and when a lens with a positive power is inserted, the pupil diameter on the image is large. Therefore, the control unit 70 may correct the pupil diameter based on the eyeglass power previously acquired by the lens meter LM or the like. For example, the control unit 70 may correct the pupil diameter acquired by analyzing the anterior eye image by performing a correction calculation using a correction value previously set for each eyeglass lens power. For example, when the eyeglass lenses have a negative power, the pupil diameter is corrected to be large according to the power, and when the eyeglass lenses have a positive power, the pupil diameter is corrected to be small according to the power. This makes it possible to obtain a more accurate pupil diameter even when a refractive corrective device is worn.

[0094] The control unit 70 may calculate the pupil diameter from a face image captured by the imaging optical system 100. In this case, too, the pupil diameter may be corrected according to the power of the eyeglass lenses.

[0095] In addition, if the subjective test is performed while wearing glasses with the appropriate lens power, but the subject's vision is not good, the fitting of the glasses may be inappropriate. For example, the VD may not be set correctly. In such a case, the control unit 70 may notify the examiner that the fitting of the glasses is inappropriate. For example, the control unit 70 may notify the examiner of how much the VD deviates from the appropriate value. For example, if glasses of -10D are made and a subjective test is performed, and a deviation of 0.2D occurs, the control unit 70 may display a warning on the monitor 4 that the VD is not correct by about 2 mm. This allows the examiner to easily understand that the fitting of the glasses is inappropriate.

[0096] For example, when making glasses with VD=12 mm, if the glasses worn during the subjective test do not have a VD of 12 mm (for example, if the VD is misaligned due to the temporary frame), the control unit 70 may correct the refractive power of the target by the amount of VD misalignment.

[0097] The control unit 70 may detect a deviation between the subject's PD (pupillary distance) and the optical axis distance of the eyeglass lenses. For example, the control unit 70 calculates the PD based on the face image of the subject captured by the imaging optical system 100. The control unit 70 may then compare the calculated PD of the subject with the optical axis distance of the eyeglasses measured by the lens meter LM, and if the difference between them is equal to or greater than a predetermined value, may display on the monitor 4 or the like that the optical axis distance of the eyeglass lenses is not suitable. In addition to the subject's PD and the optical axis distance of the eyeglasses, the control unit 70 may also detect an optical axis deviation in the XY (up, down, left, right) directions between the visual axis of the subject's eye and the optical axis of the eyeglass lenses.

[0098] The control unit 70 may determine whether the progressive lens is suitable for the subject. For example, the control unit 70 may measure the eye position (the position of the eye relative to the eyeglass frame) in each of the distance test and the near test, and determine whether the eye position and the progressive zone length of the progressive lens in each test are suitable. For example, the control unit 70 may compare the movement amount of the eye position with the progressive zone length of the eyeglass lens, and if there is a difference of a predetermined value or more, may notify the examiner by displaying on the monitor 4 that the progressive lens is not suitable. The switching between the distance test and the near test is performed, for example, by changing the convergence angle by the deflection mirror 81 and changing the optotype presentation position by the correction optical system 60.

[0099] The control unit 70 may perform addition power measurement for progressive lenses by adding power to the front spectacles using the correction optical system 60. For example, the control unit 70 may determine an appropriate addition power by checking how the subject's eye wearing a front spectacles with minus power sees when plus power (addition power) is added by the correction optical system 60.

[0100] In the above embodiment, glasses are used as the refractive corrective device, but contact lenses or a trial frame may be used. In this case, the final prescription value can be determined by fine-tuning the power while wearing the refractive corrective device, as described above. [Explanation of symbols]

[0101] 1 Optometry equipment 2. Cabinet 4 Monitors 5 Chin rest 7 Measuring part 10 Objective Testing Optical System 25 Subjective Testing Optical System 30 Projection optical system 45 First target projection optical system 46 Second target projection optical system 50 Observation Optical System 60 Corrective optical system 70 Control section 75 Memory 90 Correction optical system 100 Imaging optical system

Claims

1. An optometry apparatus for inspecting optical characteristics of a subject's eye, comprising: a projection optical system that projects a visual target light beam toward the subject's eye; a correction optical system arranged in an optical path of the light projection optical system and changing an optical characteristic of the visual target light beam; An information acquisition means for acquiring power information of a refractive corrective device worn by a subject; A control means for controlling the correction optical system and performing additional correction on the subject's eye in a state where the refractive correction device is worn, The optometry device is characterized in that, when calculating the prescription value of a new refractive correction device based on the refractive error obtained by subjective examination when the additional correction is performed and the power information, the control means calculates the prescription value by adding the refractive error and the power of the refractive correction device.

2. the power information includes a sphere, a cylinder, and a cylinder axis of the refractive corrector; the refractive error includes a spherical error, a cylindrical error, and a cylindrical axis error; 2. The optometric apparatus according to claim 1, wherein the control means calculates the prescription value by adding the spherical power error, the cylindrical power error, and the cylindrical axis error to the spherical power, the cylindrical power, and the cylindrical axis.

3. 3. The optometric apparatus according to claim 1, wherein the control means corrects a value of a pupil diameter of the subject's eye based on the power information of the refractive corrector acquired by the information acquisition means.

4. The refractive corrective device is a pair of glasses; 4. The optometric apparatus according to claim 1, wherein the control means outputs fitting information for the glasses based on a subjective examination result.

5. The refractive corrective device is a pair of glasses having a forward tilt angle and a curvature angle that are adapted to the subject, 4. The optometric apparatus according to claim 1, wherein the control means performs additional correction on the subject's eye while the subject is wearing the spectacles.

6. The present invention further includes an image acquisition means for acquiring an image of a face including an anterior segment of the subject's eye, The refractive corrective device is a pair of glasses; The information acquiring means acquires a distance between optical axes of the glasses, 4. The optometric apparatus according to claim 1, wherein the control means detects a difference between the interpupillary distance of the subject obtained based on the image and the inter-optical distance.

Images