JP2018201858A - Spectacle-wearing parameter acquisition apparatus, spectacle-wearing parameter acquisition method, and spectacle-wearing parameter acquisition program - Google Patents

Abstract

To provide an apparatus, a method, and a program for suitably calculating spectacle-wearing parameters.SOLUTION: A spectacle-wearing parameter acquisition apparatus for measuring spectacle-wearing parameters of a subject comprises: a first optical system for projecting a light beam onto a spectacle worn by the subject to acquire a first signal of the spectacle lens portion; a second optical system for projecting a light beam onto the subject wearing the spectacle through the spectacle to acquire a second signal of the subject's eye which includes at least the cornea portion; and operation means for performing an operation process between the first signal of the first optical system and the second signal of the second optical system to acquire spectacle-wearing parameters of the subject.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a spectacle wearing parameter acquisition apparatus, a spectacle wearing parameter acquisition method, and a spectacle wearing parameter acquisition program for measuring a spectacle wearing parameter of a subject necessary for manufacturing spectacles.

  There has been proposed a spectacle wearing parameter acquisition device that photographs a face of a subject wearing a spectacle frame and calculates spectacle wearing parameters necessary for producing spectacles from the image (see Patent Document 1).

  Conventionally, attachments and stickers are attached to spectacles (for example, spectacles with spectacle lenses attached to spectacle frames, or spectacles with spectacle frames only), and the position of the spectacles is detected using these images as marks. Then, spectacle wearing parameters were measured (see Patent Document 2). Further, when photographing is performed without attaching an attachment or a seal to the glasses, the glasses are detected by detecting the edge of the glasses frame portion of the glasses from the photographed image.

JP 2007-216049 A Special table 2010-503858 gazette

  By the way, when measuring spectacle wearing parameters with high accuracy, it is necessary to detect the positional relationship between the spectacles and the eye to be examined with high accuracy. However, even when the face of the subject wearing spectacles is photographed from various directions, the spectacle frame is in the way, and it is difficult to accurately acquire the positional relationship between the spectacles and the eye to be examined. It was.

  In view of at least one of the above-described problems, the present disclosure provides a spectacle wearing parameter acquisition device, a spectacle wearing parameter acquisition method, and a spectacle wearing parameter acquisition program capable of suitably calculating spectacle wearing parameters. And

(1) A spectacle wearing parameter acquisition device according to a first aspect of the present disclosure is a spectacle wearing parameter acquisition device for measuring a spectacle wearing parameter of a subject, toward the spectacles worn by the subject. A first optical system for irradiating a light beam to acquire a first signal of the spectacle lens portion; and irradiating the light beam through the spectacles toward the subject wearing the spectacles, at least the cornea portion A second optical system for obtaining a second signal of the eye to be examined including the first optical system, wherein the first signal by the first optical system and the second signal by the second optical system are processed And calculating means for acquiring the spectacle wearing parameters of the subject.
(2) A spectacle wearing parameter acquisition method according to a second aspect of the present disclosure is a spectacle wearing parameter acquisition method for measuring a spectacle wearing parameter of a subject, toward the spectacles worn by the subject. A first signal acquisition step of acquiring the first signal by a first optical system for acquiring a first signal of the spectacle lens portion by irradiating a light beam, and toward the subject wearing the spectacles A second signal acquisition step of acquiring the second signal by a second optical system for acquiring a second signal of the eye to be examined including at least a cornea portion by irradiating a light beam through the glasses; and the first signal Calculation step of calculating the spectacle wearing parameters of the subject by calculating the first signal acquired by the acquisition step and the second signal acquired by the second signal acquisition step. And.
(3) A spectacle wearing parameter acquisition program according to a third aspect of the present disclosure is a spectacle wearing parameter acquisition program executed in a spectacle wearing parameter acquisition apparatus for measuring a spectacle wearing parameter of a subject, By being executed by the processor of the wearing parameter acquisition device, the first optical system for irradiating the light beam toward the spectacles worn by the subject and acquiring the first signal of the spectacle lens part, A first signal acquisition step of acquiring one signal, and irradiating the subject wearing the glasses with a light beam through the glasses to acquire a second signal of the eye to be examined including at least a cornea portion A second signal acquisition step of acquiring the second signal by the second optical system; the first signal acquired by the first signal acquisition step; A calculation step of calculating the second signal acquired in the second signal acquisition step and acquiring a spectacle wearing parameter of the subject is executed by the spectacle wearing parameter acquisition device. And

It is a block diagram explaining the structure of the spectacles wearing parameter acquisition apparatus. It is a schematic block diagram explaining the structure of an OCT device. It is a figure which shows an example when a cross-sectional image and a front image are displayed on the screen of a monitor. It is a figure explaining the analysis process of the acquired cross-sectional image. It is an example which shows the luminance distribution acquired by detecting a luminance level toward a to-be-tested eye side from a spectacles lens side in a cross-sectional image.

<Overview>
Hereinafter, the present embodiment will be described with reference to the drawings. 1-5 is a figure explaining the structure of the spectacles wearing parameter acquisition apparatus which concerns on this embodiment. In the following description, the left-right direction of the subject will be described as the X-axis direction, the up-down direction of the subject as the Y-axis direction, and the front-back direction of the subject will be described as the Z-axis direction. In addition, the items classified by <> below can be used independently or in association with each other.

  Note that the present disclosure is not limited to the apparatus described in the present embodiment. For example, terminal control software (program) that performs the functions of the following embodiments is supplied to a system or apparatus via a network or various storage media. A control device (for example, a CPU) of the system or device can read and execute the program.

  For example, a spectacle wearing parameter acquisition device (for example, spectacle wearing parameter acquisition device 1) is a device for measuring spectacle wearing parameters of a subject. For example, the spectacle wearing parameter acquisition device may include a first optical system (for example, the OCT optical system 100) and a second optical system (for example, the OCT optical system 100). For example, the first optical system may be used to acquire a first signal of a spectacle lens portion by irradiating a light beam toward spectacles worn by a subject. For example, the second optical system may be used to acquire a second signal of the eye of the subject including at least the cornea portion by irradiating the subject wearing the spectacles with a light beam through the spectacles. Good. For example, the spectacle wearing parameter acquisition device may include a calculation unit (for example, the control unit 70). For example, the calculation means may perform calculation processing on the first signal from the first optical system and the second signal from the second optical system to acquire the spectacle wearing parameters of the subject. With such a configuration, for example, it is possible to prevent the spectacle frame from being in the way, and to accurately acquire information on the positional relationship between the spectacles and the eye to be examined. Thereby, the spectacle wearing parameters can be suitably calculated.

  For example, the spectacle wearing parameter may be at least one of pupil information (for example, pupil position, pupil diameter, etc.) and frame information (for example, frame width, frame position, etc.). Further, for example, the spectacle wearing parameter may be any of the distances between pupils, eye position height (fitting point height), and the like as determined from pupil information and frame information. Further, for example, the spectacle wearing parameter may be at least one of a frame forward tilt angle, a spectacle wearing distance, and the like.

<First optical system and second optical system>
In addition, for example, the first optical system and the second optical system may be controlled by a control unit (for example, the control unit 70) to acquire a signal. For example, as the control means for controlling the optical system, a common control means may be used for the first optical system and the second optical system, or separate control means may be used.

  For example, a signal including the first signal and the second signal may be acquired. In this case, for example, at least a part of the first optical system and the second optical system may be combined and acquired as one signal. For example, the first signal and the second signal may be signaled as different signals.

  For example, the first signal may include at least a part of the spectacle lens portion. For example, the spectacle lens portion may be a spectacle lens portion including at least one of the front portion of the spectacle lens, the rear surface portion of the spectacle lens, and the edge portion of the spectacle lens. Of course, the first signal may be a signal related to the spectacle lens portion, and is not limited to a signal including the spectacle lens portion.

  For example, the second signal may include a signal including at least a part of the subject's eye including the corneal portion. For example, the second signal may be a signal including at least one of a lens portion and a fundus portion in addition to the cornea portion. Of course, the second signal only needs to have a configuration including at least a cornea portion, and is not limited to a signal including a crystalline lens portion and a fundus portion.

  For example, the first optical system and the second optical system may be provided with separate optical systems. Further, for example, the first optical system and the second optical system may be configured such that at least a part of the members of the optical system is also used. For example, the first optical system and the second optical system may be configured so that at least a part of the members are shared with each other. For example, the first optical system and the second optical system may be combined with at least the light source. Further, for example, the first optical system and the second optical system may be configured so that at least the detector is used.

  For example, the first signal and the second signal may be acquired at the same timing by the first optical system and the second optical system. Further, for example, the first signal and the second signal may be acquired at different timings by the first optical system and the second optical system. When the first signal and the second signal are acquired at different timings, for example, a switching unit that switches the optical system that performs signal acquisition between the first optical system and the second optical system may be provided. For example, the first signal or the second optical system may be switched by the switching means so that the first signal or the second signal is acquired by one of the first optical system or the second optical system. . As an example, the switching means may be used when the first optical system and the second optical system have a configuration in which at least part of the members of the optical system are also used.

  For example, the first optical system may be configured to include a first lens, a second lens, and a first detector. For example, the first lens may be a lens that uses a light beam as a parallel light beam. For example, the second lens may be a lens configured to receive the parallel light beam transmitted through the first lens and focus the parallel light beam on the focusing region of the spectacle lens portion. For example, the first detector may be a detector that receives a reflected light beam reflected from a focusing region of the spectacle lens portion. In the case of such a configuration, for example, the first optical system may be configured to acquire the first signal by receiving the reflected light beam by the first detector.

  Further, for example, the second optical system may include a third lens, a fourth lens, and a second detector. For example, the third lens may be a lens that uses a light beam as a parallel light beam. For example, the fourth lens may be a lens configured to receive the parallel light beam transmitted through the first lens and focus the parallel light beam on the focusing area of the eye to be examined. For example, the second detector may be a detector that receives a reflected light beam reflected from a focused region of the eye to be examined including at least the cornea portion. In the case of such a configuration, for example, the second optical system may be configured to acquire the second signal by receiving the reflected light beam by the second detector.

  In the case of the configuration as described above, for example, the computing means computes the first signal received by the first detector and the second signal received by the second detector to obtain the spectacle lens portion. A cross-sectional image with the eye to be examined including at least the corneal portion may be acquired.

  For example, as described above, in the spectacle wearing parameter acquisition device, the first optical system includes the first lens, the second lens, and the first detector, and the reflected light is received by the first detector. Thus, the first signal may be acquired. Further, for example, in the spectacle wearing parameter acquisition device, the second optical system includes a third lens, a fourth lens, and a second detector, and the reflected light is received by the second detector. Two signals may be acquired. With such a configuration, it is possible to acquire the spectacle wearing parameters with high accuracy using a simpler optical system.

  Further, for example, the first optical system includes first moving means for moving the second lens along the optical path of the first optical system, and the focusing area is changed by moving the first moving means. Also good. For example, the first moving unit may include a drive source (for example, a motor) and a drive control unit, and the drive control unit may control the drive source to move the second lens. . Further, for example, the second optical system includes a second moving unit that moves the fourth lens along the optical path of the second optical system, and the focusing region is changed by moving the second moving unit. It may be. For example, the second moving unit may include a drive source (for example, a motor) and a drive control unit, and the drive control unit may control the drive source to move the fourth lens. .

  With such a configuration, for example, the size and position of at least one of the spectacle lens portion and the eye to be examined including at least the corneal portion are different, so that at least one focusing of the spectacle lens portion and at least the eye to be examined including the corneal portion is performed. Even if the area and the focus position of the parallel light flux irradiated to each of them are shifted, the focus area of the eye to be examined including the spectacle lens part and at least the cornea part and the focus of each parallel light flux The position can be easily adjusted. Thereby, the spectacle wearing parameters can be acquired with high accuracy.

  For example, the first optical system and the second optical system may be OCT optical systems. For example, the OCT optical system may include a configuration related to an interferometer for obtaining OCT data of an eye to be examined including an eyeglass lens portion or at least a cornea portion using the OCT principle. For example, the OCT optical system may have a basic configuration of Fourier domain optical coherence tomography (FD-OCT). Further, for example, the OCT optical system includes a standard OCT for detecting the reflection intensity of the test object, an OCT angiography (for example, Doppler OCT) for detecting the motion contrast data of the test object, and a polarization-sensitive OCT (PS). -OCT: polarization sensitive OCT). For example, the OCT optical system may be a multi-function OCT in which standard OCT and PS-OCT are combined. For example, as the FD-OCT, a wavelength sweep type OCT (SS-OCT) or a spectral domain OCT (SD-OCT) may be used.

  For example, when the first optical system is an OCT optical system, the first optical system includes a first measurement optical system (for example, the measurement optical system 106), a first reference optical system (for example, the reference optical system 110), And a third detector (for example, detector 120), and the first signal may be acquired by detecting the interference signal with the third detector. For example, the first measurement optical system may share a part of the optical path of the first optical system. For example, the third detector detects, as the first signal, an interference signal between the reflected light beam of the light beam irradiated toward the glasses via the first measurement optical system and the reference light beam from the first reference optical system. May be. In this case, for example, the calculation means processes the spectrum intensity (spectrum interference signal) of the first signal (in this case, the interference signal) by the first optical system, thereby acquiring the first OCT signal of the spectacle lens portion. May be. For example, the calculation means may acquire the first OCT image data of the spectacle lens portion based on the first OCT signal.

  For example, when the second optical system is an OCT optical system, a second measurement optical system (for example, the measurement optical system 106), a second reference optical system (for example, the reference optical system 110), and a fourth detector (For example, the detector 120), and the second signal may be acquired by detecting the interference signal by the fourth detector. For example, the second measurement optical system may share a part of the optical path of the second optical system. For example, the fourth detector includes an interference signal between the second reference optical system, the reflected light beam of the light beam irradiated toward the subject via the second measurement optical system, and the reference light beam from the second reference optical system. May be detected as the second signal. In this case, for example, the arithmetic means processes the second OCT signal of the eye to be examined including at least the corneal portion by processing the spectral intensity (spectral interference signal) of the second signal (in this case, the interference signal) by the second optical system. You may make it acquire. For example, the computing means may acquire the second OCT image data of the eye to be examined including at least the corneal portion based on the second OCT signal.

  Note that, for example, OCT image data (for example, first OCT image data and second OCT image data) includes cross-sectional image data indicating the reflection intensity characteristic of the eye to be examined, OCT angio image data (for example, OCT motion contrast image data) of the eye to be examined. It may be at least one of Doppler OCT image data indicating Doppler characteristics of the eye to be examined, polarization characteristic image data indicating polarization characteristics of the eye to be examined, and the like. Each data may be generated image data, or may be signal data before an image is generated.

  For example, the cross-sectional image data may be B-scan cross-sectional image data. In this case, for example, the cross-sectional image data may be three-dimensional cross-sectional image data. In this case, for example, the OCT image data includes OCT front image data acquired from the three-dimensional cross-sectional image data (for example, an integrated image integrated in the depth direction, and an integration of spectrum data at each XY position. Value, luminance data at each XY position in a certain depth direction, retina surface layer image, etc.). Note that, for example, the B-scan cross-sectional image data is cross-sectional image data acquired by causing the measurement light to scan in one of the XY directions (for example, the X direction) along the scan line (transverse position). It may be. Note that, for example, the three-dimensional cross-sectional image data may be cross-sectional image data acquired by two-dimensionally scanning the measurement light.

  For example, the OCT angio image data may be two-dimensional OCT angio image data. Further, for example, the OCT angio image data may be three-dimensional OCT angio image data. Further, for example, the OCT angio image data may be front motion contrast data acquired from three-dimensional motion contrast data. Note that, for example, the two-dimensional OCT angio image data is obtained by scanning the measurement light in one of the XY directions (for example, the X direction) along the scanning line (transverse position). It may be image data. Note that, for example, the three-dimensional OCT angio image data may be OCT angio image data acquired by two-dimensionally scanning the measurement light.

  For example, as described above, in the spectacle wearing parameter acquisition device, the first optical system includes the first measurement optical system, the first reference optical system, and the third detector, and interference is caused by the third detector. The first signal may be acquired by detecting the signal. For example, in the spectacle wearing parameter acquisition device, the second optical system includes a second measurement optical system, a second reference optical system, and a fourth detector, and an interference signal is detected by the fourth detector. Thus, the second signal may be acquired. With such a configuration, since the spectacle wearing parameters can be acquired based on the interference signal, the positional relationship between the spectacles and the eye to be examined at a position avoiding the spectacle frame can be accurately acquired. For this reason, it is possible to acquire the spectacle wearing parameters accurately with a simpler optical system.

  For example, when the first optical system is an OCT optical system, the first optical system may include a splitter (light splitter) (for example, coupler 104) and a combiner (light combiner) (for example, coupler 104). . For example, the splitter may divide the light from the light source (for example, the light source 102) into the measurement optical path of the first measurement optical system and the reference optical path of the first reference optical system. For example, a beam splitter, a half mirror, a fiber coupler, a circulator, or the like may be used as the splitter or combiner. For example, the combiner may combine (interfer) the measurement light from the measurement optical path of the first measurement optical system reflected by the spectacle lens portion and the reference light from the reference optical path of the first reference optical system. For example, an optical scanner (for example, the optical scanner 108) may be provided in the measurement optical path of the first measurement optical system. For example, an optical scanner may be used to scan measurement light over a spectacle lens portion.

  For example, when the second optical system is an OCT optical system, the second optical system may include a splitter (an optical splitter) (for example, a coupler 104) and a combiner (an optical combiner) (for example, the coupler 104). . For example, the splitter may divide the light from the light source (for example, the light source 102) into the measurement optical path of the second measurement optical system and the reference optical path of the second reference optical system. For example, a beam splitter, a half mirror, a fiber coupler, a circulator, or the like may be used as the splitter or combiner. For example, the combiner may combine (interfere) the measurement light from the measurement optical path of the second measurement optical system reflected by the subject's eye and the reference light from the reference optical path of the second reference optical system. . For example, an optical scanner (for example, the optical scanner 108) may be provided in the measurement optical path of the second measurement optical system. For example, the optical scanner may be used for scanning measurement light on an eye to be examined including at least a corneal portion.

  For example, the spectacle wearing parameter acquisition device may include setting means (for example, the control unit 70) that determines the distance between the spectacle lens portion and the eye to be examined including at least the cornea portion. In this case, for example, the setting means determines the distance between the spectacle lens portion and the eye to be examined including at least the cornea portion based on the optical path length difference between the first reference optical system and the second reference optical system. You may do it. The distance between the spectacle lens portion and the eye to be examined including at least the corneal portion may be a distance in the depth direction between the spectacle lens portion and the eye to be examined including at least the corneal portion. As an example, for example, the distance between the spectacle lens portion and the eye to be examined including at least the cornea portion may be a spectacle wearing distance (VD).

  For example, the optical path length difference is acquired based on the position of the optical member (for example, the reference mirror 111) in the first reference optical system and the position of the optical member (for example, the reference mirror 111) in the second reference optical system. May be. For example, the optical member in the first reference optical system and the second reference optical system may be a mirror, a lens, or the like. In this case, for example, the optical path length adjustment is performed so that the optical member in the first reference optical system is moved and the interference signal of the spectacle lens portion is acquired. Further, for example, the optical path length adjustment is performed so that the optical member in the second reference optical system is moved and an interference signal of the eye to be examined including at least the cornea portion is acquired. For example, the setting unit may obtain a difference (optical path length difference) between the position of the optical member in the first reference optical system after the optical path length adjustment and the position of the optical member in the second reference optical system.

  In this way, for example, the spectacle wearing parameter acquisition device is configured to provide a spectacle lens portion and an eye to be examined that includes at least the cornea portion based on the optical path length difference between the first reference optical system and the second reference optical system. A setting means for determining the distance may be provided. Accordingly, the optical path length adjustment for acquiring the first signal and the second signal can be performed, and the spectacle wearing parameters can be acquired based on the optical path length difference, so that the spectacle lens portion and at least the cornea portion are included. The distance between the eye to be examined can be easily and accurately acquired.

  In the present embodiment, the setting unit is configured to determine the distance between the spectacle lens portion and the eye to be examined including at least the cornea portion based on the optical path length difference between the first reference optical system and the second reference optical system. However, the present invention is not limited to this. For example, the setting means determines the distance between the spectacle lens portion and the eye to be examined including at least the cornea portion based on the optical path length difference between the first measurement optical system and the second measurement optical system. Also good. For example, the optical member in the first measurement optical system and the second measurement optical system may be a mirror, a lens, or the like. In this case, for example, the optical path length adjustment is performed so that the optical member in the first measurement optical system is moved and the interference signal of the spectacle lens portion is acquired. Further, for example, the optical path length adjustment is performed so that the optical member in the second measurement optical system is moved and an interference signal of the eye to be examined including at least the cornea portion is acquired. For example, the setting unit may obtain a difference (optical path length difference) between the position of the optical member in the first measurement optical system after the optical path length adjustment and the position of the optical member in the second measurement optical system.

<Calculation means>
For example, the computing means computes a first signal from the first optical system and a second signal from the second optical system to obtain a cross-sectional image of the spectacle lens portion and the eye to be examined including at least the cornea portion. You may do it.

  For example, the calculation means may acquire spectacle wearing parameters based on the cross-sectional image. Thus, by acquiring the spectacle wearing parameters based on the cross-sectional image, the spectacle wearing parameters can be acquired with an easy configuration. Of course, for example, the calculation means may acquire the spectacle wearing parameters based on the OCT image data.

  In the present embodiment, the control unit, the setting unit, and the calculation unit may be combined. Further, for example, a configuration in which a control unit, a setting unit, and a calculation unit are separately provided may be possible. Of course, each of the control means may be constituted by a plurality of control means.

  Note that the technology of the present disclosure is not limited to the device described in the present embodiment. For example, spectacle wearing parameter acquisition software (program) that performs the functions of the above embodiments is supplied to a system or apparatus via a network or various storage media. A control device (for example, a CPU) of the system or device can read and execute the program.

<Example>
In the following, one exemplary embodiment will be described with reference to the drawings. FIG. 1 is a block diagram illustrating the configuration of the spectacle wearing parameter acquisition apparatus according to the present embodiment.

  For example, the spectacle wearing parameter acquisition device 1 is used to acquire spectacle wearing parameters from a cross-sectional image taken by an optical coherence tomography device (OCT device) 10. For example, the spectacle wearing parameter acquisition device 1 includes, as an example, an OCT device 10, a CPU (calculation control unit) 70, a mouse (operation unit) 76, a nonvolatile memory (storage unit) 72, and a monitor 75. Is done. Each unit is electrically connected to an arithmetic control unit (control unit) 70 via a bus or the like.

  The spectacle wearing parameter acquisition device 1 is connected to an OCT device 10 for capturing an image of the spectacle lens portion and at least the cornea portion in the eye to be examined. As an example, in this embodiment, an optical coherence tomography apparatus (hereinafter referred to as an OCT device) 10 is described as an example of an imaging apparatus for imaging a cross-sectional image of an eyeglass lens part and at least a cornea part in an eye to be examined. To do. In this embodiment, the configuration in which the OCT device 10 is connected to the spectacle wearing parameter acquisition apparatus 1 is taken as an example, but the present invention is not limited to this. An apparatus in which an OCT device is integrated with the spectacle wearing parameter acquisition apparatus 1 may be used.

  For example, the control unit 70 controls the operation of each unit based on an arithmetic program and various control programs stored in the memory 72. In addition, as the control unit 70, the operation unit 76, the memory 72, and the monitor 75, various processing programs are installed on a commercially available PC by using an arithmetic processing unit, an input unit, a storage unit, and a display unit of a commercially available PC (personal computer). You may do it.

  The OCT device 10 according to the present embodiment has the eyeglass lens portion and at least the eye to be examined including the cornea within the imaging range, and collectively acquires the first signal of the eyeglass lens portion and the second signal of the eye to be examined including at least the cornea. A description will be given by taking as an example a configuration capable of the above. Of course, the OCT device 10 is not limited to this configuration, and may be a configuration in which a subject eye including a spectacle lens portion and at least the cornea is separately imaged. In this case, for example, the OCT device 10 has a first optical system for acquiring the first signal of the spectacle lens portion and a second optical system for acquiring the second signal of the eye to be examined including at least the cornea. The first optical system and the second optical system may be switched to obtain the first signal and the second signal in order. In this case, for example, the first optical system for the OCT device 10 to acquire the first signal of the spectacle lens portion, and the second optical system for acquiring the second signal of the eye to be examined including at least the cornea, The first optical system and the second optical system may acquire the first signal and the second signal at the same time. In the present embodiment, “simultaneous” includes substantially simultaneous.

  For example, FIG. 2 is a schematic configuration diagram illustrating the configuration of the OCT device 10 according to the present embodiment. The outline of the apparatus configuration will be described below with reference to FIGS. For example, in this embodiment, the OCT device 10 includes an OCT image data for photographing an eyeglass lens portion (hereinafter referred to as eyeglass lens) L and at least a cornea portion of an eye to be examined (hereinafter referred to as eye to be examined) E. It is a device. For example, in this embodiment, a case where cross-sectional image data (hereinafter referred to as a cross-sectional image) is photographed as OCT image data will be described as an example. For example, the OCT device 10 includes an interference optical system (OCT optical system) 100. For example, the OCT device 10 includes a front observation optical system 200 and a fixation target projection unit 300. For example, the OCT device 10 is connected to the control unit 70. That is, the spectacle wearing parameter acquisition device 1 includes a configuration in which the OCT device 10 is connected to the spectacle wearing parameter acquisition device 1. In other words, the spectacle wearing parameter acquisition device 1 includes the OCT device 10.

  For example, the OCT optical system 100 irradiates measurement light to the spectacle lens L in spectacles and the eye E to be examined in the subject. For example, the OCT optical system 100 detects the interference state between the measurement light reflected from the spectacle lens L and the eye E and the reference light by the light receiving element (detector 120). For example, since the OCT optical system 100 changes the imaging position on the spectacle lens L and the eye E, the OCT optical system 100 changes the irradiation position of the measurement light on the spectacle lens L and the eye E (for example, an optical scanner). 108, a fixation target projection unit 300). For example, the control unit 70 controls the operation of the irradiation position changing unit based on the set imaging position information, and acquires a cross-sectional image based on the light reception signal from the detector 120.

<OCT optical system>
The OCT optical system 100 will be described. For example, the OCT optical system 100 has an apparatus configuration of a so-called ophthalmic optical tomography (OCT: Optical coherence tomography), and captures cross-sectional images of the eyeglass lens L and the eye E to be examined. For example, the control unit 70 acquires the OCT signal by controlling the OCT optical system 100. The OCT optical system 100 splits the light emitted from the measurement light source 102 into measurement light (sample light) and reference light by a coupler (light splitter) 104. The OCT optical system 100 guides the measurement light to the spectacle lens L and the eye E using the measurement optical system 106 and guides the reference light to the reference optical system 110. Thereafter, the detector 120 receives interference light obtained by combining the measurement light reflected by the eyeglass lens L and the eye E and the reference light.

  The detector 120 detects an interference signal between the measurement light and the reference light. In the case of Fourier domain OCT, the spectral intensity (spectral interference signal) of the interference light is detected by the detector 120, and the OCT signal is acquired by Fourier transform on the spectral intensity data.

  For example, in the Fourier domain OCT, the depth profile (A scan signal) in a predetermined range is acquired by calculating the absolute value of the amplitude in the OCT signal acquired by Fourier transform on the spectral intensity data. B-scan cross-sectional image data (B-scan cross-sectional image) is acquired by arranging the depth profiles at each scanning position of the measurement light scanned by the optical scanner 108.

  In the present embodiment, the first signal of the spectacle lens L and the second signal of the eye E are included in one interference signal and detected. Thereby, an OCT signal including the first OCT signal based on the first signal and the second OCT signal based on the second signal is acquired, and a depth profile (A scan signal) based on the OCT signal is acquired. Further, a B-scan cross-sectional image based on an interference signal including the first signal of the spectacle lens L and the second signal of the eye E by arranging the depth profile at each scanning position of the measurement light scanned by the optical scanner 108. Data (B-scan cross-sectional image) is acquired.

  For example, examples of the Fourier domain OCT include Spectral-domain OCT (SD-OCT) and Swept-source OCT (SS-OCT). For example, Time-domain OCT (TD-OCT) may be used. In the case of SD-OCT, a low-coherent light source (broadband light source) is used as the light source 102, and the detector 120 is provided with a spectroscopic optical system (spectrometer) that separates interference light into each frequency component (each wavelength component). . The spectrometer includes, for example, a diffraction grating and a line sensor. In the case of SS-OCT, a wavelength scanning light source (wavelength variable light source) that changes the emission wavelength at a high speed in time is used as the light source 102, and a single light receiving element is provided as the detector 120, for example. The light source 102 includes, for example, a light source, a fiber ring resonator, and a wavelength selection filter. Examples of the wavelength selection filter include a combination of a diffraction grating and a polygon mirror, and a filter using a Fabry-Perot etalon.

  The light emitted from the light source 102 is split into a measurement light beam and a reference light beam by the coupler 104. Then, the measurement light flux passes through the optical fiber and is then emitted into the air. The light beam is condensed on at least one of the spectacle lens L and the eye E through the other optical member of the measurement optical system 106, the optical scanner 108, and the other optical member of the measurement optical system 106. In the present embodiment, a case where the light beam is focused on the cornea of the eye to be examined will be described as an example. Then, the light reflected by the eyeglass lens L and the eye E is returned to the optical fiber through the same optical path.

  The optical scanner 108 scans the measurement light two-dimensionally (XY directions) on the spectacle lens L and the eye E. The optical scanner 108 is arranged at a position substantially conjugate with the pupil. The optical scanner 108 is, for example, two galvanometer mirrors, and the reflection angle thereof is arbitrarily adjusted by the drive mechanism 50.

  Thereby, the reflection (advance) direction of the light beam emitted from the light source 102 is changed, and is scanned at an arbitrary position on the spectacle lens L and the eye E to be examined. Thereby, the imaging position on the spectacle lens L and the eye E is changed. The optical scanner 108 may be configured to deflect light. For example, in addition to a reflective mirror (galvano mirror, polygon mirror, resonant scanner), an acousto-optic device (AOM) that changes the traveling (deflection) direction of light is used.

  The reference optical system 110 generates reference light that is combined with reflected light acquired by reflection of measurement light from the spectacle lens L and the eye E. The reference optical system 110 may be a Michelson type or a Mach-Zehnder type. The reference optical system 110 is formed by, for example, a reflection optical system (for example, a reference mirror), and reflects light from the coupler 104 back to the coupler 104 by being reflected by the reflection optical system and guides it to the detector 120. As another example, the reference optical system 110 is formed by a transmission optical system (for example, an optical fiber), and guides the light from the coupler 104 to the detector 120 by transmitting the light without returning.

  The reference optical system 110 has a configuration in which the optical path length difference between the measurement light and the reference light is changed by moving an optical member in the reference optical path. For example, the reference mirror 111 is moved in the optical axis direction. The configuration for changing the optical path length difference may be arranged in the measurement optical path of the measurement optical system 106.

<Front observation optical system>
For example, the front observation optical system 200 acquires front image data of the eye to be examined. The front image data may be generated image data or signal data before an image is generated. For example, the front observation optical system 200 is provided to obtain a front image of a spectacle lens part (hereinafter referred to as spectacle lens) and at least a cornea part of an eye to be examined (hereinafter referred to as eye to be examined). In this embodiment, the front observation optical system 200 includes, for example, an optical scanner that two-dimensionally scans measurement light (for example, infrared light) emitted from a light source on the eyeglass lens L and the eye E, and the eye to be examined. A so-called ophthalmic scanning laser ophthalmoscope (SLO), comprising: a spectacle lens or a second light receiving element that receives reflected light of the eye to be examined through a confocal aperture disposed substantially at a conjugate position with the pupil; have.

  The configuration of the front observation optical system 200 may be a so-called fundus camera type configuration. Further, for example, an infrared imaging optical system that images a subject using infrared light may be used. Further, for example, the OCT optical system 100 may also serve as the front observation optical system 200. That is, the front image data (hereinafter referred to as a front image) may be acquired using data forming a two-dimensionally obtained cross-sectional image (OCT front image).

  The front observation optical system 200 may not be integrated with the OCT device 10 or the like. In this case, for example, front image data acquired by a separately provided front observation optical system 200 may be received by the OCT device 10 or the like.

<Fixation target projection unit>
For example, the fixation target projecting unit 300 has an optical system for guiding the line-of-sight direction of the eye E. The fixation target projection unit 300 has a fixation target to be presented to the eye E, and can guide the eye E in a plurality of directions.

  For example, the fixation target projection unit 300 includes a fixation lamp that emits visible light, and changes the presentation position of the visual target two-dimensionally. As the fixation target projection unit 300, for example, a configuration in which the fixation position is adjusted by the lighting positions of fixation lamps (for example, LEDs) arranged in a matrix, light from the fixation lamp is scanned by an optical scanner. Various configurations such as a configuration in which the fixation position is adjusted by lighting control of the fixation lamp are conceivable. The fixation target projection unit 300 may be an internal fixation lamp type or an external fixation lamp type.

<Control unit>
The control unit 70 includes a CPU (processor), a RAM, a ROM, and the like. The CPU of the control unit 70 controls the entire spectacle wearing parameter acquisition device 1 such as the members of the components 100 to 300. The RAM temporarily stores various information. Various programs for controlling the operation of the spectacle wearing parameter acquisition device 1, initial values, and the like are stored in the ROM of the control unit 70. The control unit 70 may be configured by a plurality of control units (that is, a plurality of processors).

  For example, a nonvolatile memory (storage means) 72, an operation unit (control unit) 76, a display unit (monitor) 75, and the like are electrically connected to the control unit 70. The non-volatile memory (memory) 72 is a non-transitory storage medium that can retain stored contents even when power supply is interrupted. For example, a hard disk drive, a flash ROM, an OCT device 10, and a USB memory that is detachably attached to the OCT optical system 100 can be used as the nonvolatile memory 72.

  For example, the memory 72 stores an imaging control program for controlling imaging of front image data and cross-sectional image data by the OCT optical system 100. The memory 72 also stores a calculation program that makes it possible to acquire spectacle wearing parameters from the cross-sectional image data. Further, the memory 72 stores various types of information related to photographing such as B-scan cross-sectional image data and three-dimensional cross-sectional image data on the scanning line, front image data (fundus front image data), and information on the photographing position of the cross-sectional image data. The Various operation instructions by the examiner are input to the operation unit 76.

  For example, the memory 72 stores positional information of the optical axis of the fixation target projection unit 300 (fixation lamp of the fixation target projection unit 300) with respect to the optical axis of the OCT optical system 100. As described above, the positional information of the optical axis of the fixation target projection unit 300 with respect to the optical axis of the OCT optical system 100 is stored, so that fixation with respect to the cross-sectional image data and the front image data acquired by the OCT optical system 100 is performed. The position of the light can be grasped. Note that position information of the optical axis of the fixation target projection unit 300 with respect to the optical axis of the front observation optical system 200 may be stored.

  For example, the operation unit 76 outputs a signal corresponding to the input operation instruction to the control unit 70. For the operation unit 76, for example, at least one of a mouse, a joystick, a keyboard, a touch panel, and the like may be used.

  For example, the monitor 75 may be a display mounted on the apparatus main body or a display connected to the main body. A display of a personal computer (hereinafter referred to as “PC”) may be used. A plurality of displays may be used in combination. The monitor 75 may be a touch panel. When the monitor 75 is a touch panel, the monitor 75 functions as an operation unit. The monitor 75 displays various images including cross-sectional image data and front image data captured by the OCT optical system 100.

<Cross-section image shooting operation>
Hereinafter, a series of imaging operations using the OCT device 10 will be described. For example, the subject information (ID number, name, age, gender, chief complaint, comment, etc. for identifying the subject) is input as preparation for acquiring the cross-sectional image by the OCT device 10. On the monitor 75, a cross-sectional image acquired by the OCT optical system 100, a front image acquired by the front observation optical system 200, a screen for setting various imaging conditions, and the like are displayed. FIG. 3 is a diagram illustrating an example when a cross-sectional image and a front image are displayed on the screen of the monitor 75.

  For example, when the operation unit 76 is operated by the examiner and the photographing mode is selected, the control unit 70 turns on the fixation lamp for the photographing mode. In the following description, the case where the eye to be inspected acquires a spectacle wearing parameter in the far vision state as an imaging mode will be described as an example of the spectacle wearing parameter. For example, the control unit 70 controls the fixation target projection unit 300 to turn on a fixation lamp for far vision for causing the subject's eye to be viewed far away.

  For example, after the fixation lamp is turned on, the examiner instructs the subject to gaze at the fixation target of the fixation target projection unit 300, and then is photographed by an anterior eye observation camera (not shown). While viewing the anterior ocular segment observation image on the monitor 75, an alignment operation is performed using an operation unit 76 (for example, a joystick (not shown)) so that the measurement optical axis comes to the center of the pupil of the eye to be examined.

  For example, when the alignment operation is completed, the control unit 70 controls the driving of the optical scanner 108, scans the measurement light on the fundus in a predetermined direction, and performs predetermined scanning from an output signal output from the detector 120 during scanning. A light reception signal corresponding to the region is acquired to form a cross-sectional image. In addition, the control unit 70 controls the OCT optical system 100 to acquire a cross-sectional image, and also controls the observation optical system 200 to acquire a spectacle lens and a front image of the eye to be examined. And the control part 70 acquires a cross-sectional image by the OCT optical system 100, and a front image (front image) by the observation optical system 200 at any time. As a result, the cross-sectional image 65 and the front image 60 are displayed on the screen of the monitor 75.

  For example, the control unit 70 displays the front image 60, the index 25, and the cross-sectional image 65 acquired by the observation optical system 200 on the monitor 75. The index 25 is an index representing the photographing position (acquisition position) of the cross-sectional image on the front image 60 and the scan pattern. That is, when the scan pattern is changed, the control unit 70 changes the display pattern of the index based on the changed scan pattern. For example, the index 25 is electrically superimposed and displayed on the front image 60 on the monitor 75. For example, the cross-sectional image 65 shows a cross-sectional image acquired at a cutting position on the index 25. In the present embodiment, for example, the cross-sectional image 65 includes a spectacle lens cross-sectional image 66 and an eye cross-sectional image 67 to be examined. In the present embodiment, as an initial setting of the index 25, a cross-sectional image of a horizontal scan at the center position of the front image 60 is displayed. Of course, cross-sectional images at different scan positions may be displayed at the time of shooting.

  For example, the eye cross-sectional image 67 is a cross-sectional image of a spectacle lens. For example, the spectacle lens cross-sectional image 66 includes a spectacle lens front cross-sectional image 66a and a spectacle lens rear cross-sectional image 66b. The spectacle lens sectional image 66 may be a sectional image including at least one of the spectacle lens front sectional image 66a and the spectacle lens rear sectional image 66b. In this embodiment, the case where a cross-sectional image of the eye cornea to be examined is acquired as an example of the cross-sectional image of the eye to be examined is not limited to this. For example, the cross-sectional image 65 may include a frame portion of glasses.

  For example, the cross-sectional image 67 of the eye to be examined is a cross-sectional image of the cornea of the eye to be examined. For example, the test eye cross-sectional image 67 includes a test eye cornea front cross-sectional image 67a and a test eye cornea rear cross-sectional image 67b. Note that the test eye cross-sectional image 67 may be a cross-sectional image including at least one of the test eye cornea front cross-sectional image 67a and the test eye cornea rear cross-sectional image 67b. In this embodiment, the case where a cross-sectional image of the eye cornea to be examined is acquired as an example of the cross-sectional image of the eye to be examined is not limited to this. For example, the cross-sectional image 65 may be configured to include a crystalline lens portion of the eye to be examined.

  After the cross-sectional image 65 and the front image 60 are displayed on the screen of the monitor 75, for example, the examiner operates the operation unit 76 to perform optimization control (for example, optical path length adjustment, focus adjustment, polarization adjustment, etc.). To implement. For example, the examiner then operates the operation unit 76 to select a scan pattern of measurement light (line, cross line, raster, circle, radial, etc.) from the scan scan pattern setting field 35. In this embodiment, for example, a case where the examiner selects a line scan and acquires cross-sectional image data (cross-sectional image) by the OCT optical system 100 will be described as an example. Of course, the configuration for acquiring the cross-sectional image is not limited to the line scan.

  Next, the scanning position is set. For example, the examiner sets the position of the cross-sectional image 65 that the examiner wants to photograph from the front image 60 on the monitor 75 observed in real time. Here, the examiner moves the index 25 with respect to the front image 60 by performing a drag operation using the operation unit 76, and sets the scanning position.

  When the index 25 is moved with respect to the front image 60 by the examiner, the control unit 70 sets the scanning position at any time and acquires a cross-sectional image at the corresponding scanning position. And the acquired cross-sectional image is displayed on the display screen of the monitor 75 at any time. Further, the control unit 70 changes the scanning position of the measurement light based on the operation signal output from the operation unit 76, and displays the index 25 at the display position corresponding to the changed scanning position.

  When a scan pattern, a scanning position, and the like are set by the examiner and an imaging switch (not shown) is selected, the control unit 70 acquires a front image and a cross-sectional image based on the set scanning position.

  When an imaging switch (not shown) is selected, for example, the control unit 70 obtains a cross-sectional image of the eyeglass lens and the eye to be examined corresponding to the position of the index 25 based on the display position of the index 25 set on the front image 60. As obtained, the optical scanner 108 is driven to scan the measurement light. Since the relationship between the display position of the index 25 (coordinate position on the monitor 75) and the scanning position of the measurement light by the optical scanner 108 is determined in advance, the control unit 70 corresponds to the set display position of the index 25. The two galvanometer mirrors of the optical scanner 108 are appropriately driven and controlled so that the measurement light is scanned within the scanning range. For example, the control unit 70 acquires an interference signal corresponding to a predetermined scanning region from an output signal output from the detector 120 during scanning of the measurement light. The control unit 70 performs a Fourier transform process on the acquired interference signal to acquire a cross-sectional image.

  Further, the control unit 70 controls the front observation optical system 200 and acquires a front image. Further, for example, the control unit 70, together with the photographed cross-sectional image, photographing information (fixation position information, photographing part information, left and right eye information, etc.), selection range information (scanning pattern, scanning position, scanning range, etc.) Is stored in the memory 72. As described above, a cross-sectional image is acquired by the OCT device 10.

<Obtain glasses parameters>
For example, when a cross-sectional image is acquired, the control unit 70 analyzes the cross-sectional image and acquires spectacle wearing parameters. FIG. 4 is a diagram for explaining the analysis processing of the acquired cross-sectional image 65. In the present embodiment, a case where a cross-sectional image is analyzed and a spectacle wearing distance (VD) is acquired as an spectacle wearing parameter will be described as an example. Of course, the spectacle wearing parameter is not limited to VD.

  For example, the control unit 70 performs image processing (for example, edge detection) on the acquired cross-sectional image to detect a spectacle lens. For example, the control unit 70 performs image processing on the acquired cross-sectional image to detect the eye to be examined. For example, the control unit 70 measures the distance from the spectacle lens to the eye to be examined based on the detected spectacle lens and the eye to be examined, and calculates VD.

  This will be described in more detail. For example, the control unit 70 detects the luminance level of the cross-sectional image 65. For example, the control unit 70 detects the luminance level of the tomographic image 65 and detects a predetermined portion on the cross-sectional image 65. For example, in this embodiment, the control unit 70 detects the luminance level of the tomographic image 65 and detects the spectacle lens and the eye to be examined. For example, when detecting the spectacle lens, the control unit 70 detects the spectacle lens by detecting the spectacle lens cross-sectional image 66 in the cross-sectional image 65. For example, when detecting the eye to be examined, the control unit 70 detects the eye to be examined by detecting the eye cross-sectional image 67 in the cross-sectional image 65. In the present embodiment, for example, as VD, the distance from the spectacle lens rear surface portion (for example, spectacle lens rear surface cross-sectional image 66b) to the cornea front surface of the eye to be examined (test eye cornea front cross-sectional image 67a) is detected. To be acquired. That is, the control unit 70 detects the luminance level from the cross-sectional image 65, and detects the spectacle lens rear surface cross-sectional image 66b and the eye cornea front cross-sectional image 67a.

  For example, in this embodiment, when acquiring VD, a case of acquiring VD at the center position of the cross-sectional image 65 will be described as an example. For example, the control unit 70 acquires the luminance distribution of the scanning line S1 that passes through the center position of the cross-sectional image 65, and acquires VD. In the present embodiment, when the cross-sectional image 65 is acquired, since the corneal vertex position is aligned with the central position of the cross-sectional image 65 by the fixation lamp, the central position of the cross-sectional image 65 is obtained. The cross-sectional image of the corneal apex position 68 of the eye to be examined has been acquired. That is, in this embodiment, VD is acquired as the distance from the spectacle lens to the corneal apex position of the eye to be examined. Of course, the VD is not limited to the distance from the spectacle lens to the corneal apex position of the eye to be examined. For example, VD may be the distance from the spectacle lens to the vicinity of the corneal apex position of the eye to be examined.

  For example, the control unit 70 acquires the luminance distribution of the scanning line S1 passing through the center position of the cross-sectional image 65, and detects the spectacle lens rear surface cross-sectional image 66b and the eye cornea front cross-sectional image 67a from the acquired luminance distribution. FIG. 5 is an example showing the luminance distribution acquired by detecting the luminance level from the eyeglass lens side toward the eye to be examined in the cross-sectional image 65.

  For example, in the luminance distribution 95, in the portion where the spectacle lens is present, the interference light between the measurement light reflected by the spectacle lens and the reference light is detected, so that the luminance increase (for example, peak) corresponding to the spectacle lens is detected. Appears. In addition, for example, in the acquired luminance distribution 95, in a portion where the spectacle lens is present, interference light between the measurement light reflected by the spectacle lens and the reference light is detected, and thus the luminance increase corresponding to the spectacle lens is increased. (For example, a peak) appears.

  For example, the control unit 70 detects the peak portion from the luminance distribution 95, thereby detecting the spectacle lens rear surface cross-sectional image 66b and the eye cornea front cross-sectional image 67a. In the present embodiment, for example, in the luminance distribution 95, peaks can be detected in the order of the spectacle lens front cross-sectional image 66a, the spectacle lens rear cross-sectional image 66b, the eye cornea front cross-sectional image 67a, and the subject eye cornea rear cross-sectional image 67b.

  For example, the control unit 70 detects a peak portion from the luminance distribution 95. In FIG. 5, for example, the control unit 70 has four peaks (each peak of the spectacle lens front cross-sectional image 66a, the spectacle lens rear cross-sectional image 66b, the eye cornea front cross-sectional image 67a, and the subject eye cornea rear cross-sectional image 67b). Can be detected. For example, the control unit 70 detects the second peak among the four detected peaks as the spectacle lens rear surface cross-sectional image 66b. Further, for example, the control unit 70 detects the third peak among the four detected peaks as the to-be-tested cornea front cross-sectional image 67a. In addition, when detecting a peak, you may make it detect a peak by determining whether it exceeds the set threshold value, for example. For example, the threshold value may be calculated in advance through experiments, simulations, or the like. For example, the threshold value may be any threshold value that can remove noise and detect a spectacle lens and an eye to be examined.

  For example, the control unit 70 calculates the difference in position between the detected spectacle lens rear surface cross-sectional image 66b and the detected eye cornea front cross-sectional image 67a, and acquires VD. For example, the control unit 70 may calculate VD from the difference in the coordinate position (for example, pixel position) between the spectacle lens rear surface cross-sectional image 66b and the eye cornea front cross-sectional image 67a. Of course, the calculation of VD is not limited to the above method, and any method may be used as long as it is calculated based on the positions of the spectacle lens rear surface cross-sectional image 66b and the eye cornea front cross-sectional image 67a. For example, the acquired VD is stored in the memory 72. As described above, the spectacle wearing parameters in the far vision state are acquired. The acquired eyeglass parameters are used for selection of an optimum progressive lens, production of a custom lens, and the like.

  In the present embodiment, the case of acquiring the spectacle wearing parameters in the far vision state is described as an example, but the present invention is not limited to this. For example, the spectacle wearing parameters in the near vision state can be acquired in the same manner as in the far vision state. In this case, for example, the operation unit 76 is operated by the examiner, and the mode for acquiring the spectacle wearing parameters in the near vision state is selected as the imaging mode. For example, the control unit 70 controls the fixation target projection unit 300 to turn on a fixation lamp for near vision for causing the subject's eye to be viewed near. In this state, by acquiring a cross-sectional image and analyzing the acquired cross-sectional image, it is possible to acquire spectacle wearing parameters in the near vision state.

  Thus, in this embodiment, for example, the spectacle wearing parameter acquisition device is a spectacle wearing parameter acquisition device for measuring the spectacle wearing parameters of the subject, and is directed toward the spectacles worn by the subject. A first optical system for irradiating a light beam to acquire a first signal of the spectacle lens portion, and a subject that includes at least the cornea portion by irradiating the light beam through the spectacles toward a subject wearing the spectacles. A second optical system for obtaining a second signal of the optometry. In addition, for example, the spectacle wearing parameter acquisition device includes an arithmetic unit that performs arithmetic processing on the first signal from the first optical system and the second signal from the second optical system to acquire the spectacle wearing parameters of the subject. Prepare. Thereby, for example, it is possible to prevent the spectacle frame from being in the way, to acquire information on the positional relationship between the spectacles and the eye to be examined with high accuracy, and to appropriately calculate spectacle wearing parameters.

  Further, for example, in the spectacle wearing parameter acquisition device, the first optical system passes through the first measurement optical system, the first reference optical system, and the first measurement optical system that share a part of the optical path of the first optical system. And a third detector for detecting an interference signal between the reflected light beam of the light beam irradiated toward the glasses and the reference light beam from the first reference optical system, and the interference signal is detected by the third detector. Thus, the first signal may be acquired. Further, for example, in the spectacle wearing parameter acquisition device, the second optical system passes through the second measurement optical system, the second reference optical system, and the second measurement optical system that share a part of the optical path of the second optical system. And a fourth detector for detecting an interference signal between the reflected light beam of the light beam irradiated toward the subject and the reference light beam from the second reference optical system, and the interference signal is detected by the fourth detector. Thus, the second signal may be acquired. With such a configuration, since the spectacle wearing parameters can be acquired based on the interference signal, the positional relationship between the spectacles and the eye to be examined at a position avoiding the spectacle frame can be accurately acquired. For this reason, it is possible to acquire the spectacle wearing parameters accurately with a simpler optical system.

  In addition, for example, the computing means computes the first signal from the first optical system and the second signal from the second optical system to obtain a cross-sectional image of the spectacle lens part and the eye to be examined including at least the cornea part. May be obtained. Further, the computing means may acquire the spectacle wearing parameters based on the cross-sectional image. Thus, by acquiring the spectacle wearing parameters based on the cross-sectional image, the spectacle wearing parameters can be acquired with an easy configuration.

<Transformation example>
In the present embodiment, the configuration in which the spectacle lens and the eye to be examined are detected by performing image processing and the spectacle wearing parameters are obtained is described as an example, but the present invention is not limited to this. A measurement part may be specified. The spectacle wearing parameter may be acquired by selecting the spectacle lens portion and the eye to be examined by the examiner. For example, any two points on the cross-sectional image (the front surface position of the spectacle lens and the corneal apex position of the eye to be examined) are selected through operation (for example, click) of the operation unit 76. For example, the control unit 70 may acquire a specified distance between two points as a spectacle wearing parameter.

  In the present embodiment, the configuration in which the luminance distribution in one scanning line S1 is acquired from the cross-sectional image 65 and the VD is acquired has been described as an example, but the present invention is not limited to this. For example, in the cross-sectional image 65, luminance distributions at a plurality of positions may be acquired and a plurality of VDs may be acquired. In this case, for example, the VD may be acquired by acquiring the average value of the VD acquired by each scanning line.

  In the present embodiment, the configuration in which the cross-sectional image 65 is acquired and the spectacle wearing parameters are acquired based on the cross-sectional image 65 has been described as an example, but the present invention is not limited thereto. For example, the control unit 70 determines the distance between the spectacle lens portion and the eye to be examined including at least the cornea portion based on the optical path length difference between the first reference optical system and the second reference optical system. May be. In this case, for example, the OCT device 10 may separately acquire signals from the spectacle lens and the eye to be examined. For example, the control unit 70 controls the reference mirror 111 to adjust the position of the reference mirror 11 so that the first signal of the spectacle lens is acquired. For example, the control unit 70 controls the reference mirror 111 to adjust the position of the reference mirror 11 so that the second signal of the eye to be examined is acquired. For example, the control unit 70 is based on the optical path length difference between the position of the reference mirror 111 for acquiring the first signal of the spectacle lens and the position of the reference mirror 111 for acquiring the second signal of the eye to be examined. VD may be acquired. Thus, for example, the optical path length adjustment for acquiring the first signal and the second signal can be performed, and the spectacle wearing parameters can be acquired based on the optical path length difference. Therefore, the spectacle lens portion and at least the cornea The distance to the eye to be examined including the part can be easily and accurately acquired.

  Note that the present invention is not limited to the apparatus described in this embodiment. For example, spectacle wearing parameter acquisition software (program) that performs the functions of the above embodiments is supplied to a system or apparatus via a network or various storage media. A computer of the system or apparatus (for example, a CPU) can also read and execute the program.

DESCRIPTION OF SYMBOLS 1 Glasses wearing parameter acquisition apparatus 10 Optical coherence tomography device 15 Display part 70 CPU
72 Memory 75 Monitor 76 Operation Unit 100 OCT Optical System 102 Measurement Light Source 120 Detector 200 Front Observation Optical System 300 Fixation Target Projection Unit

Claims (9)

A spectacle wearing parameter acquisition device for measuring a spectacle wearing parameter of a subject,
A first optical system for irradiating a light beam toward spectacles worn by a subject and acquiring a first signal of the spectacle lens portion;
A second optical system for irradiating the subject wearing the spectacles with a light beam through the spectacles and acquiring a second signal of the eye to be examined including at least a cornea portion;
With
A computing means for computing the first signal from the first optical system and the second signal from the second optical system to obtain a spectacle wearing parameter of the subject;
A spectacle wearing parameter acquisition device comprising: In the spectacle wearing parameter acquisition device according to claim 1,
The first optical system receives a first lens that makes a light beam a parallel light beam and the parallel light beam transmitted through the one lens, and focuses the parallel light beam on a focusing region of the spectacle lens portion. A first lens configured to receive the reflected light beam reflected from the focusing region of the spectacle lens portion, and receiving the reflected light beam by the first detector. Obtaining the first signal;
The second optical system receives a third lens that converts a light beam into a parallel light beam, and the parallel light beam transmitted through the three lenses, and focuses the parallel light beam on a focusing area of the eye to be examined. A fourth lens configured, and a second detector that receives a reflected light beam reflected from the in-focus area of the eye to be inspected, and the second detector receives the reflected light beam to receive the first light beam. A spectacle wearing parameter acquisition apparatus characterized by acquiring two signals. In the spectacle wearing parameter acquisition device according to claim 2,
The first optical system includes first moving means for moving the second lens along the optical path of the first optical system, and changes a focusing area by moving the first moving means,
The second optical system includes a second moving unit that moves the fourth lens along an optical path of the second optical system, and the focusing region is changed by moving the second moving unit. A spectacle wearing parameter acquisition device. In the spectacle wearing parameter acquisition device according to claim 1,
The first optical system is irradiated toward the glasses via the first measurement optical system, the first reference optical system, and the first measurement optical system that share a part of the optical path of the first optical system. A third detector for detecting an interference signal between the reflected light beam of the reflected light beam and the reference light beam from the first reference optical system, and detecting the interference signal by the third detector, thereby detecting the first signal. Acquired,
The second optical system is directed toward the subject via the second measurement optical system, the second reference optical system, and the second measurement optical system that share a part of the optical path of the second optical system. A fourth detector for detecting an interference signal between a reflected light beam of the irradiated light beam and a reference light beam from the second reference optical system, and detecting the interference signal by the fourth detector. A spectacle wearing parameter acquisition apparatus characterized by acquiring a signal. In the spectacle wearing parameter acquisition device according to claim 4,
Setting means for determining a distance between the spectacle lens portion and the eye to be examined including at least the cornea portion based on an optical path length difference between the first reference optical system and the second reference optical system;
A spectacle wearing parameter acquisition device comprising: In the spectacles wearing parameter acquisition device according to any one of claims 1 to 5,
The computing means computes the first signal from the first optical system and the second signal from the second optical system, and the eye to be examined includes the spectacle lens part and the at least corneal part. A spectacle wearing parameter acquisition device characterized by acquiring a cross-sectional image of the eyeglasses. In the spectacle wearing parameter acquisition device according to claim 6,
The calculation means acquires a spectacle wearing parameter based on the cross-sectional image. A method for acquiring spectacle wearing parameters for measuring spectacle wearing parameters of a subject,
A first signal acquisition step of acquiring the first signal by a first optical system for acquiring a first signal of the spectacle lens portion by irradiating the eyeglasses worn by the subject with a light beam;
The second signal is acquired by a second optical system for acquiring a second signal of the eye to be examined including at least a cornea portion by irradiating the subject wearing the glasses with a light beam through the glasses. A second signal acquisition step,
Computation for obtaining the spectacle wearing parameters of the subject by computing the first signal obtained by the first signal obtaining step and the second signal obtained by the second signal obtaining step. Steps,
A method for acquiring spectacle wearing parameters. A spectacle wearing parameter acquisition program executed in a spectacle wearing parameter acquisition device for measuring a spectacle wearing parameter of a subject,
By being executed by the processor of the spectacle wearing parameter acquisition device,
A first signal acquisition step of acquiring the first signal by a first optical system for acquiring a first signal of the spectacle lens portion by irradiating the eyeglasses worn by the subject with a light beam;
The second signal is acquired by a second optical system for acquiring a second signal of the eye to be examined including at least a cornea portion by irradiating the subject wearing the glasses with a light beam through the glasses. A second signal acquisition step,
Computation for obtaining the spectacle wearing parameters of the subject by computing the first signal obtained by the first signal obtaining step and the second signal obtained by the second signal obtaining step. Steps,
Is executed by the spectacle wearing parameter acquisition device.

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