JP2017184789A - Spectacle prescription assisting device and spectacle prescription assisting program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spectacle prescription assisting device and a spectacle prescription assisting program capable of more appropriately evaluating the visibility of an eye to be examined when a spectacle lens is put on.SOLUTION: A CPU 30 of a spectacle prescription assisting device 1 acquires a simulation image which is a simulation image generated based on first distribution data which is measurement data on an eye to be examined by a wavefront sensor 200, and is related to the distribution of a refraction error of the eye to be examined, and power information in a part of a spectacle lens for correcting the refraction error of the eye to be examined, and in which a visual target image formed on the ocular fundus in the eye to be examined on which the spectacle lens is put is simulated. The CPU 30 causes a monitor 50 to display position information indicating a position corresponding to the simulation image in the spectacle lens together with the simulation image.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to an eyeglass prescription assisting apparatus and an eyeglass prescription assisting program for assisting prescription of eyeglasses by evaluating the appearance of an eye to be examined when wearing eyeglasses.

  There is known an optometry apparatus that measures the distribution of refraction errors, the distribution of aberrations, and the like in the eye to be examined. The measurement result obtained by such an apparatus may be used for evaluating the appearance of the eye to be examined.

  For example, in Patent Document 1 by the present applicant, a simulation image for showing how a visual target image is formed in the eye to be examined while wearing a spectacle lens for correcting a refraction error of the eye to be examined. In addition to the measurement result of the refractive power distribution, a method has been proposed in which the power of the spectacle lens is taken into consideration.

Japanese Patent Laying-Open No. 2015-144730

  For example, when the spectacle lens is a multifocal lens or the like, the appearance of the visual target image may vary depending on the position where the line of sight passes through the spectacle lens, the three-dimensional positional relationship between the spectacle lens and the eye to be examined, etc. In literature 1, these viewpoints are not necessarily fully examined.

  The present disclosure has been made based on at least one of the problems of the prior art, and a glasses prescription assisting device that more effectively displays a simulation image showing how the eye to be examined looks when wearing eyeglass lenses, The purpose is to provide an eyeglass prescription assistance program.

  An eyeglass prescription assisting device according to a first aspect of the present disclosure is measurement data of an eye to be examined by a wavefront sensor, and is used to correct the first distribution data regarding the refractive error distribution of the eye to be examined and the refraction error of the eye to be examined. A simulation image that is generated based on the frequency information in a part of the spectacle lens and obtains a simulation image in which a target image formed on the fundus in the eye to be examined wearing the spectacle lens is simulated Image acquisition means, and display control means for displaying, on the monitor, position information indicating the position of the part of the spectacle lens corresponding to the simulation image, together with the simulation image acquired by the simulation image acquisition means. .

  An eyeglass prescription assisting device according to a second aspect of the present disclosure is measurement data of an eye to be examined by a wavefront sensor, and is used to correct the first distribution data regarding the refractive error distribution of the eye to be examined and the refraction error of the eye to be examined. An acquisition means for acquiring partial frequency information that is frequency information in a part of the spectacle lens and positional relationship information that is information regarding a positional relationship between the spectacle lens and the eye to be examined, and imaging on the fundus of the eye to be examined A simulation image that is a simulation image of a target image, and that acquires a simulation image relating to an eye to be examined in a state where a spectacle lens is worn based on the first distribution data, the partial frequency information, and the positional relationship information. Image acquisition means.

  The eyeglass prescription auxiliary program according to the third aspect of the present disclosure is executed by a processor of a computer, and is measurement data of an eye to be examined by a wavefront sensor, the first distribution data relating to the refractive error distribution of the eye to be examined, A simulation image generated based on frequency information in a part of a spectacle lens for correcting a refraction error of the eye to be examined, and a target image formed on the fundus in the eye to be examined wearing the spectacle lens A simulation image acquisition step of acquiring a simulation image obtained by simulating, and a simulation image acquired in the simulation image acquisition step together with position information indicating the position of the part corresponding to the simulation image in the spectacle lens. A display control step to be displayed, and To be executed by a computer.

  The eyeglass prescription assist program according to the fourth aspect of the present disclosure is executed by a computer processor, and is measurement data of the eye to be examined by the wavefront sensor, the first distribution data relating to the distribution of the refractive error of the eye to be examined, An acquisition step of acquiring partial power information that is power information in a part of the spectacle lens for correcting a refraction error of the eye to be examined, and positional information that is information on a positional relation between the spectacle lens and the eye to be examined; A simulation image of a target image formed on the fundus of the eye to be examined, the simulation image relating to the eye to be examined in a state where a spectacle lens is worn, the first distribution data, the partial frequency information, and the position The computer is caused to execute a simulation image acquisition step acquired based on the relationship information.

  The present disclosure has an effect that it is possible to more appropriately evaluate the appearance of the eye to be examined when the spectacle lens is worn.

It is the model which showed the outline | summary of the optometry system which concerns on this indication. It is the schematic diagram which showed schematic structure of the spectacles prescription assistance apparatus which concerns on embodiment. It is the figure which showed the flow of operation | movement in the spectacles prescription assistance apparatus. It is the figure which showed the extraction point of the data regarding each refractive power distribution of a correction lens and an eye to be examined. It is the figure which showed the 1st display example of the simulation image. It is the 2nd display example of a simulation image, Comprising: The example of a display in the case of showing the change of the appearance linked with the transition of a gaze is shown. It is a table | surface which shows the position of the gaze passage area | region set according to the presentation distance of the target in simulation. It is a table | surface which shows how much adjustment power is used for the 1st distribution data selected according to the presentation distance of the target in simulation. It is the figure which showed the 2nd example of a display of a simulation image, Comprising: The example of a display in the case of displaying a list of the several simulation image from which the presentation distance of a target differs is shown. It is the figure which showed the 2nd example of a display of a simulation image, Comprising: It is a figure which shows the example of a display with the graphic utilized in order to change the conditions of simulation.

  Hereinafter, an eyeglass prescription assisting apparatus and an eyeglass prescription assisting program according to the present disclosure will be described based on embodiments. The spectacle prescription assisting device 1 and the spectacle prescription assisting program are used to obtain information for evaluating the appearance of the eye to be examined when the spectacle lens is worn. For example, if the appearance of a subject wearing a spectacle lens (hereinafter referred to as an “old lens”) can be evaluated, a spectacle store or an ophthalmologist (hereinafter collectively referred to as “spectacle store”). In this case, the examiner can easily determine whether or not the subject is recommended to replace the spectacle lens. Further, for example, if the appearance when various existing spectacle lenses are worn can be evaluated, a spectacle lens to be newly prescribed for the subject (hereinafter referred to as “new lens”) can be easily selected. become.

<System overview>
First, an outline of an eyeglass prescription assisting apparatus (hereinafter referred to as “this apparatus”) 1 according to the embodiment will be described with reference to FIG. The apparatus 1 is a computer, and a spectacle prescription assisting program according to the present embodiment is executed by the processor.

  The apparatus 1 includes data relating to the refractive power distribution of the eye to be examined (“first distribution data” in the present embodiment) and data relating to the refractive power distribution of the spectacle lens (“second distribution data” in the present embodiment). Acquire and process these data. Here, the data relating to the distribution of the refraction error of the eye to be examined is obtained as a measurement result of the eye to be examined by the wavefront sensor. Moreover, the data regarding the refractive power distribution of the spectacle lens may be obtained as a measurement result of the spectacle lens by a lens meter. However, the data regarding the refractive power distribution of the spectacle lens does not necessarily need to be a measurement result (measurement value), and may be a design value of the spectacle lens. The design value is provided from, for example, a spectacle lens manufacturer (so-called lens manufacturer). The design value may be stored in advance in a database accessible by the apparatus 1 or a memory 31 (see FIG. 2) of the apparatus 1 or may be input to the apparatus 1 each time.

  The device 1 may be an integrated (same housing) device with at least one of the wavefront sensor and the lens meter, or may be a separate device (for example, a separate housing). . In the case of an integrated device, the device 1 processes the signal from the detector to derive data relating to the refractive error distribution of the eye to be examined or data relating to the refractive power distribution of the spectacle lens. Also good. Further, when the device 1 is separate from both the wavefront sensor and the lens meter, the device 1 may be a general-purpose computer (for example, a PC, a tablet, or the like), for example. Of course, the present apparatus 1 may be another apparatus that is supposed to be used in a spectacle store or the like, or a device connected to a client computer placed in a spectacle store or the like via a network such as a LAN or WAN. May be. A typical example of the latter apparatus is a server computer. In this case, the server computer stores one or more data related to the distribution of the refractive error of the eye E. Next, the data regarding the refractive error distribution of the eye E and the data regarding the refractive power distribution of the spectacle lens stored in advance or separately received from the client computer are processed according to the spectacle prescription assistance program. Then, the processing result is transmitted to the client computer.

  In addition, when various data such as data relating to the refractive error distribution of the eye to be examined and data relating to the refractive power distribution of the spectacle lens are delivered from the other device to the present device 1, the delivery may be performed online. However, it may be performed offline. In the case of offline, delivery may be performed via any medium such as a removable disk (for example, USB memory), RFID, and barcode.

  First, in the description of this embodiment, it is assumed that the device 1 is a device integrated with a wavefront sensor.

  In the present embodiment, the apparatus 1 measures the optical characteristics of the eye E, and the measurement data indicating the measurement result is stored in the storage unit (the memory 31, see FIG. 2) of the apparatus 1. In the apparatus 1, at least the refraction error distribution of the eye E is measured. For this reason, the measurement data includes at least data related to the refraction error distribution of the eye E (hereinafter referred to as “first distribution data”).

  The first distribution data is data for specifying the refractive characteristics of the eye corresponding to each position in the pupil. For example, the first distribution data may be data expressed in any form of refraction error and aberration, or may be data expressed in a form other than these. The first distribution data may be data measured in a state where the accommodation force of the eye E is not intervening, or may be data measured in a state where the accommodation force is intervening. Further, the plurality of first distribution data may be acquired by changing the usage ratio of the adjustment force.

  As shown in FIG. 1, the present apparatus 1 may be capable of transmitting / receiving data to / from other apparatuses online or offline. As another device, for example, any device used for measurement of an eye or a spectacle lens or processing of a spectacle lens in a spectacle store or the like may be used. FIG. 1 shows a lens meter 200 and a spectacle wearing parameter measurement device 300 as examples of other devices. However, the present apparatus 1 is not necessarily limited to this, and the apparatus 1 may further be capable of transmitting and receiving data to and from apparatuses such as an autorefractor, a frame tracer, and a lens edger.

  The lens meter 200 obtains measurement data of refractive power distribution in a wide range (for example, the entire range) of the spectacle lens. For the detailed configuration of the lens meter 200, see, for example, Japanese Patent Application Laid-Open No. 2006-275971 by the present applicant. The measurement data is stored in the storage unit (memory 31, see FIG. 2) of the apparatus 1. Measurement data obtained by the lens meter 200 may be transferred to and stored in the storage unit (memory 31, see FIG. 2) of the apparatus 1. In the present embodiment, among the measurement data obtained by the lens meter 200, the measurement data for a partial region of the spectacle lens is acquired by the present apparatus 1 as the second distribution data.

  The second distribution data may be distribution data of frequencies (S: spherical power, C: columnar power, A: astigmatic axis angle) at a plurality of positions in a partial region. Further, it may be refractive power (power) distribution data. The second distribution data includes at least information regarding refractive power (refractive power, power, aberration, etc.) at three or more extraction points having different distances from the lens center. Similar to the first distribution data, the second distribution data may be data expressed in an aberration format, or may be data expressed in a format other than these.

  The lens meter 200 in this embodiment has the following configuration, for example. That is, a projection optical system that projects measurement light onto a spectacle lens and an imaging optical system that captures the measurement light that has passed through the spectacle lens with a two-dimensional light receiving element as a pattern image composed of a plurality of index images. As a result of processing the captured image, second distribution data is derived. Note that the processing for deriving the second distribution data from the image obtained by the two-dimensional light receiving element may be performed by, for example, an arithmetic processing device (for example, CPU) of the lens meter 200 main body, or the CPU 30 (see FIG. 2). In any case, the second distribution data obtained as a result of the processing is acquired by the apparatus 1 (stored in the memory 31).

  The spectacle wearing parameter measurement device 300 (hereinafter referred to as “eye position meter”) is used to obtain measurement data relating to the relative positional relationship between the spectacle lens and the eye E. The measurement data is not limited to the eye position (eye point) with respect to the spectacle lens (spectacle frame), for example. The distance between the eye E and the spectacle lens (for example, the corneal apex distance VD), the spectacle lens The direction of the line of sight with respect to (for example, derived based on the line-of-sight direction and the warp angle of the spectacle frame), the passing position of the line of sight with respect to the spectacle lens, and the like may be included. Further, the measurement data may be obtained for one or more (preferably two or more) of far vision, near vision, and their middle.

  The eye position meter 300 in the present embodiment has the following configuration, for example. That is, a camera (imaging device) that captures the face of the subject wearing the spectacle frame, and an arithmetic processing device (for example, CPU) that measures the relative position of the eye with respect to the spectacle frame from a captured image obtained by the camera; ,have. The eye position meter 300 shown in FIG. 1 is separate from the apparatus 1, but is not limited to this. For example, the apparatus 1 and the eye position meter 300 may be integrated (in other words, the same housing may be used). In the case of integration, measurement data relating to the eye position is calculated by the CPU 30 (see FIG. 2) of the apparatus 1. In the present embodiment, measurement data relating to the eye position is stored in the storage device (memory 31, see FIG. 2) of the device 1.

<Schematic configuration of this device>
Next, a schematic configuration of the apparatus 1 in the present embodiment will be described with reference to FIG. As shown in FIG. 2, the apparatus 1 includes at least a CPU (an example of an arithmetic processing unit) 30 and a memory (storage device) 31. The CPU 30 is a processor that controls main operations in the apparatus 1.

  The memory 31 is a storage device that stores various information, and stores at least a volatile storage medium (for example, a register, a cache, and a RAM) that temporarily stores data, a control program, fixed data, and the like. Non-volatile storage media (for example, ROM, HDD, flash memory, etc.). In the apparatus 1, the glasses prescription assistance program may be stored in a nonvolatile storage medium. The nonvolatile storage medium may include a storage medium that can be repeatedly rewritten. In this case, data obtained as an execution result of the spectacle prescription assisting program may be stored in a rewritable nonvolatile storage medium.

  Note that the eyeglass prescription assistance program of the present disclosure is not necessarily stored in the memory 31 of the apparatus (computer) 1 and may be in the following manner. For example, an eyeglass prescription assistance program is stored in an external storage device 35 for the device 1, and the program is read from the storage device 35 by the processor of the device 1 and processing is executed. May be.

  In addition to the CPU 30 and the memory 31, the present apparatus 1 may include, for example, an external storage device 35, an operation unit 40, a monitor 50, and the like. Each member is connected to each other through a data bus or the like.

  The operation unit 40 is an input interface for an examiner to input an operation. In addition, various information related to the eye E is displayed on the monitor 50 as text and graphics. In the present embodiment, display control of the monitor 50 is performed by the CPU 30. That is, in the present embodiment, the CPU 30 also serves as a display control unit.

  In the present embodiment, the measurement unit 100 is included in the apparatus 1. The measurement unit 100 includes at least a refractive power measurement optical system 10 (also referred to as an ocular aberration measurement optical system, hereinafter simply referred to as “measurement optical system”). The measurement optical system 10 has a detector 22. The measurement optical system 10 projects spot-like measurement light into the pupil of the eye to be examined, and detects the fundus reflection light of the measurement light extracted from the pupil by the detector 22.

  The detection signal output from the detector 22 is processed by the CPU 30. As a result, the present apparatus 1 acquires measurement data of the eye to be inspected by the wavefront sensor, and data (hereinafter referred to as “first distribution data”) relating to the refractive error distribution of the eye to be inspected (stored in the memory 31). To do.

  2 illustrates a Shack-Hartmann sensor type wavefront sensor as the measurement optical system 10 (details will be described later), but the measurement optical system 10 is not necessarily limited thereto. In other words, the measurement optical system 10 may be another optical system that is used to measure data related to the distribution of the refractive error of the eye to be examined. For example, a Talbot wavefront sensor (for details, see Japanese Patent Application Laid-Open No. 2006-149871 by the present applicant) may be used. Alternatively, a phase difference type wavefront sensor may be used (that is, a configuration in which a slit light beam is projected onto the fundus and a reflected light beam is detected by a light receiving element, and a phase difference signal is output. (See Kaihei 10-10883). In the phase difference method, the first distribution data of the eye E is obtained as a processing result of the phase difference signal.

  Here, the detailed configuration of the measurement optical system 10 shown in FIG. 2 will be described. The measurement optical system 10 includes a light projecting optical system 10a and a light receiving optical system 10b. For example, the light projecting optical system 10a projects a spot-like light beam from a measurement light source onto the eye fundus. For example, the light receiving optical system 10b divides a light beam reflected from the fundus and emitted from the eye to be measured into a plurality of light beams and causes the two-dimensional light receiving element (an example of a detector) 22 to receive the light.

  More specifically, the light projecting optical system 10 a includes a relay lens 12 and an objective lens 14 in order from the light source (measurement light source) 11. The light source 11 is disposed at a position conjugate with the fundus. The light receiving optical system 10b includes an objective lens 14, a half mirror 13, a relay lens 16, a total reflection mirror 17, a collimator lens 19, a micro lens array 20, and a two-dimensional light receiving element 22 in order from the front of the eye E to be examined. The light receiving optical system 10b is configured so that the pupil of the eye to be examined and the microlens array 20 are in an optically conjugate relationship. The microlens array 20 includes a microlens and a light shielding plate that are two-dimensionally arranged on a plane orthogonal to the measurement optical axis, and divides the fundus reflection light into a plurality of light beams.

  The light beam emitted from the measurement light source 11 is projected onto the fundus of the subject eye via the relay lens 12, the objective lens 14, and the pupil of the subject eye. Thereby, a point light source image is formed on the fundus of the eye to be examined.

  The point light source image projected onto the fundus of the subject's eye exits the subject's eye as a reflected light beam, is collected by the objective lens 14, and then reflected by the half mirror 13. The light reflected by the half mirror 13 is once condensed by the relay lens 16 and then reflected by the total reflection mirror 17. The light beam reflected by the total reflection mirror 17 is split into a plurality of light beams by the lens array 20 via the collimator lens 19 and then received by the two-dimensional light receiving element 22. The pattern image received by the two-dimensional light receiving element 22 is stored in the memory 31 as image data.

  The pattern image that is divided into a plurality of light beams by the lens array 20 and received by the two-dimensional light receiving element changes due to the influence of the aberration (low-order aberration, high-order aberration) of the eye to be examined. By analyzing the pattern image generated by the reflected light from the eye to be examined with respect to the reference pattern image when non-aberration light passes, it is possible to measure the wavefront aberration distribution and refractive power distribution of the eye. In the present embodiment, the distribution data obtained in this way is stored in the memory 31 as the first distribution data.

  Further, the present apparatus 1 may have an anterior eye camera (not shown) that captures an anterior eye image including a pupil part of the eye to be examined. From the anterior segment image, for example, the pupil diameter of the eye to be examined can be measured. Such an anterior segment camera may be configured to be able to capture an image by switching the amount of illumination light. For example, an anterior segment image of the eye to be examined in each of photopic vision and dusk vision may be captured. In this case, even if it is set as the structure which can adjust an illumination light source output to the 1st illumination light quantity for photopic photography, and the 2nd illumination light quantity for dusk vision photography smaller than the 1st illumination light quantity Good.

  Further, as described above, the present apparatus 1 may be connected to other devices such as the lens meter 200 and the eye position meter 300. When information output from these other devices is input to the present device 1, the information is stored in the memory 31.

<Description of operation>
Next, the operation of the apparatus 1 will be described with reference to FIG.

  For example, first, the examiner measures the optical characteristics of the eye E with respect to the distribution of refraction errors via the measurement unit 100 of the apparatus 1. As a result, at least the first distribution data is stored (acquired) in the memory 31 of the apparatus 1 (step 1).

  The examiner may measure the optical characteristics of the spectacle lens with the lens meter 200 before or after (or in parallel with) the measurement of the eye E. After the measurement, the second distribution data as the spectacle lens measurement data is input to the apparatus 1 online or offline, and as a result, the second distribution data is stored (acquired) in the memory 31 of the apparatus 1. (Step 2).

  Moreover, the pupil diameter in the eye to be examined may be measured. Further, measurement data relating to the relative positional relationship between the spectacle lens and the eye E (eye point, distance between the eye and the spectacle lens, the direction of the line of sight with respect to the spectacle lens, the passing position of the line of sight with respect to the spectacle lens, etc.) It may be measured via another device such as the eye position meter 300 and stored in the memory 31 of the device 1 (step 3). Note that the pupil diameter may be measured for either photopic vision or twilight vision. Each of the pupil diameter of photopic vision and the pupil diameter of dusk vision may be measured, for example, from each of the anterior segment image of photopic vision and the anterior segment image of scotopic vision.

  Based on the first distribution data and the second distribution data, the CPU 30 obtains third distribution data related to the refraction error distribution in consideration of correction by the spectacle lens (step 4). For example, in step 4, a difference between the second distribution data and the first distribution data is obtained, and the third distribution data may be acquired as the difference. Note that, when the units of the first distribution data and the second distribution data are different from each other, an arithmetic process for matching the units may be included in step 4.

  For example, in FIG. 3, the CPU 30 calculates the difference between the refractive error distribution data in the eye to be examined (an example of the first distribution data) and the refractive power distribution data in the spectacle lens (a specific example of the second distribution data). As a result, third distribution data is generated. Of course, when data in the form of aberration is obtained as the third distribution data, the form of refractive power may be changed to the form of aberration. Of course, the first distribution data and the second distribution data may be combined (difference is taken) in the form of aberration, and as a result, third distribution data in the form of aberration may be obtained.

  The lens meter 200 obtains a wide range of refractive power distribution in the spectacle lens as measurement data, but data on the entire spectacle lens is not necessarily required to evaluate the appearance when the spectacle lens is worn. Therefore, for example, as shown in FIG. 3, data about a part of the area GA among the measurement data of the spectacle lens is mainly considered. For example, GA may be data regarding the line-of-sight passage position of the eye E to be examined and its vicinity area (in the present embodiment, both are collectively referred to as “line-of-sight passage area”). The position of such a region GA may be determined by the CPU 30 based on the eye point information acquired by the eye position meter 300.

  Further, the size of the region GA may be set according to the pupil diameter of the eye to be examined. Then, the CPU 30 performs superposition based on the second distribution data in the area GA. The area GA is approximately the same size as the pupil diameter in the eye E.

  Note that the value of the pupil diameter may be acquired based on, for example, a captured image of the anterior segment. The captured image of the anterior segment may be captured by the apparatus 1, may be captured by the eye position meter 300, or may be an image captured by another apparatus. Further, the pupil diameter may be selectable between a value in photopic vision and a value in dusk vision. Note that the pupil diameter does not necessarily have to be detected based on a captured image of the anterior segment. For example, the pupil diameter may be set based on the pupil diameter manually input by the examiner via the operation unit 40. The estimated value according to the age of the subject may be sufficient, and a mere fixed value may be sufficient.

  Further, parameters other than the pupil diameter may be considered in deriving the size of the region GA. For example, the relative positional relationship between the spectacle lens and the eye to be examined may be considered. Specific examples of the positional relationship include an eye point, a distance between the eye and the spectacle lens, an orientation of the line of sight with respect to the spectacle lens, and a passing position of the line of sight with respect to the spectacle lens. Also, the power of the spectacle lens may be taken into account.

  Further, the position of the area GA is not necessarily set based on the eye point information. For example, the region GA may be set at the position of the feature point in the spectacle lens such as the lens center, the near point or the far point in the progressive multifocal lens. Of course, it is not restricted to this, You may set with respect to arbitrary positions on a spectacle lens other than these. The position of the area GA may be set either automatically or manually with respect to the spectacle lens.

  In the case of automatic setting, for example, the CPU 30 determines a lens type (for example, a spherical lens, a bifocal lens, or a progressive multifocal lens) based on the second distribution data, and is determined. The position may be set according to the type. For example, the region GA may be set in at least one of the feature points in the spectacle lens as described above.

  Further, as shown in FIG. 4, the positions and the numbers of the extraction points of the first distribution data in the pupil of the eye E and the extraction points of the second distribution data in the spectacle lens (more specifically, the region GA) are The case where it does not correspond is considered. For example, the number of extraction points per unit area may be different between the measurement unit 100 and the lens meter 200, or the viewing direction may be inclined with respect to the spectacle lens. The extraction point mentioned here may be a refractive power measurement point. When the second distribution data is a design value of a spectacle lens, each extraction point related to the spectacle lens may be a design representative point indicating a refractive power.

  On the other hand, in the present embodiment, the superposition of at least one of refractive power and aberration is determined by the extraction point of the first distribution data in the pupil of the eye E and the spectacle lens (more specifically, , Region GA) is performed after matching at least one of the number and position of the extraction points of the second distribution data. Various methods can be used as the matching method.

  For example, for a subject eye or a spectacle lens, a function for fitting either a refractive power distribution or an aberration distribution is derived from the values of a plurality of extraction points, and superposition is performed based on the derived function. May be. As a result of the above alignment processing, it is possible to satisfactorily overlap at least one of the refractive power and the aberration distribution in each of the eye to be examined and the spectacle lens.

  Further, when matching the first distribution data and the second distribution data, the relative positional relationship between the spectacle lens and the eye to be examined may be considered. For example, when the line-of-sight direction is inclined with respect to the spectacle lens, the first distribution data and the second distribution are corrected by correcting the second distribution data in the region GA with respect to a component that intersects the lens axis of the spectacle lens in the line-of-sight direction. You may aim at consistency with data.

<Display simulation image>
The CPU 30 generates, for example, a simulation image based on the combined distribution data (superposition result) based on the first distribution data and the second distribution data (step 5). In the present embodiment, the simulation image indicates “an image obtained by simulating a visual target image formed on the fundus in the eye to be inspected wearing the spectacle lens” unless otherwise specified. The appearance of the target image on the eye E when wearing the spectacle lens is represented by a simulation image. The simulation image is displayed on the monitor 50, for example.

  The target used in the simulation image may be a target for subjective examination as shown in FIG. 3 (for example, ETDRS target, resolution chart, astigmatism chart, etc.). In addition, other targets such as a landscape chart and a point image (point target) may be used as targets for the simulation image. The simulation image based on the point image may be an image obtained by visualizing the point image intensity distribution (PSF) obtained by, for example, Fourier transforming the superposition result regarding the wavefront aberration. On the other hand, a simulation image of a target by a target for subjective examination or the like may be obtained by, for example, image processing (for example, convolution integration) between a point image intensity distribution (PSF) and a target, or a point image intensity distribution. An optical transfer function (OTF) obtained by further Fourier transforming (PSF) may be obtained by subjecting the target to image processing (convolution integration).

  The simulation image may be displayed together with information indicating the position of the region (here, region GA) on the spectacle lens in which the second distribution data is used in generating the simulation image. By such display, the examiner can easily grasp through which area of the lens the simulation image shows how the lens is viewed. For example, as shown in FIG. 5, a lens graphic LG indicating a spectacle lens is displayed together with the simulation image, and a display indicating the position of the region GA corresponding to the simulation image is displayed on the lens graphic LG (that is, display of position information). ) May be performed. For example, in FIG. 5, the position of the region GA corresponding to each simulation image is indicated on the lens graphic LG by a balloon line from the simulation image and a cross indicator (both are examples of passing position information). . However, the display is not limited to the display mode shown in FIG. 5 as long as the correspondence between the simulation image and the position of the area GA can be grasped.

  Note that the method of indicating the position of the region GA is not necessarily limited to the method using the lens graphic LG. For example, the CPU 30 may display text information (an example of line-of-sight passage position information) indicating the position of the region GA in the spectacle lens together with the simulation image. As the text information, for example, text indicating feature points in a spectacle lens such as a lens center, a distance point, a near point, a progressive band, a distance point periphery, a near point periphery, or the like may be used. Coordinates with the lens center or the like as a reference point (for example, the origin) may be used, or other coordinates may be used.

  The lens graphic LG may include a feature area graphic for indicating the position of the feature point of the lens. The feature area graphic may be an index placed at the position of the feature point in the lens graphic LG, for example. Further, it may be a map on the lens graphic LG for specifying the feature point. The feature point graphic is a graphic for specifying at least the distance point and the near point when the spectacle lens is a multifocal lens. An example of the map is shown in FIG. The lens graphic LG in FIG. 5 is a graphic for a progressive multifocal lens. FIG. 5 shows a feature point graphic in which the lens graphic LG is divided into a plurality of regions by the contour lines of the lens power. As shown in FIG. 5, the feature point graphic in the progressive multifocal lens shows at least the far point FP and the near point SP. Further, the present invention is not limited to this, and each feature point such as the progressive zone PZ, the distance point peripheral portion NF, and the near point peripheral portion NS may be indicated by a feature point graphic.

  As shown in FIG. 5, when the position of the area GA is indicated using the lens graphic LG, the feature point graphic indicates that the area through which the simulation image is viewed through the spectacle lens. Is easier to grasp.

  A plurality of simulation images in which the position of the region GA is different from each other in the spectacle lens may be generated.

  The plurality of simulation images may be displayed as a list on the monitor 50 as shown in FIG. In this case, as shown in FIG. 5, information indicating the position of the area GA corresponding to each simulation image may be displayed on the monitor 50. This makes it easier for the examiner to grasp the appearance of the eye to be examined with the spectacle lens worn.

  Moreover, some of the plurality of simulation images may be selectively displayed on the monitor 50. For example, one of a plurality of simulation images with different positions of the line-of-sight passage region may be displayed while being switched over time. At this time, the CPU 30 may perform switching display of a simulation image that indicates a change in appearance when the line of sight transitions (in other words, the transition of the line-of-sight passage region) by turning the eye.

  For example, as shown in FIG. 6, when the spectacle lens assumed to be worn is a progressive multifocal lens, a switching display of a simulation image is performed when the line of sight is changed along the progressive zone of the spectacle lens. May be. In this case, as shown in FIG. 6, a switching display may be performed so that a change in the target image when the line of sight transitions from at least the distance point to the near point is shown. By performing such switching display, the examiner can more appropriately grasp the feeling of use of the spectacle lens. For example, it becomes easy to grasp the degree of uncomfortable feeling given to the subject in the change in appearance when moving the line of sight.

  In addition, information indicating the position of the line-of-sight passage area (passage position information) may be switched and displayed in conjunction with the simulation image. In FIG. 6, the tip position of the balloon line from the simulation image and the position of the cross index are moved in conjunction with the simulation image. Thereby, the examiner can confirm in real time the position of the line-of-sight passage region during the switching display of the simulation image.

  Note that the line-of-sight transition speed assumed in the switching display of the simulation image may be changeable. For example, the transition speed may be set by the CPU 30 based on an operation on the operation unit 40. By performing switching display at the set transition speed, the feeling of use of the spectacle lens in various scenes can be grasped.

  Although the details will be described later, the side graphic SG of FIG. 6 shows the positional relationship when the eye to be examined and the correction lens are viewed from the side. The side graphic SG is also switched in conjunction with the simulation image switching display. Therefore, the transition state of the line-of-sight passage region when the eye to be examined and the correction lens are viewed from the side is shown.

  In addition, in the simulation image, the appearance when the target placed at a certain presentation distance from the eye to be examined is simulated is simulated. The presentation distance of this target can be selected from a plurality of values. May be. The CPU 30 may select the presentation distance from arbitrary values, or may be selectable from a plurality of predetermined values. For example, it may be possible to select from at least three kinds of values of “distance”, “near”, and “intermediate” thereof.

  In this case, for example, the CPU 30 may select the presentation distance of the target and generate the simulation image in consideration of the selected presentation distance. Specific examples are shown below. Of course, the specific examples may be implemented in combination, or only a part may be implemented.

  Here, a specific example in which the presentation distance of the visual target is taken into consideration when generating the simulation image will be shown. For example, the presentation distance may be considered in setting the area GA for the spectacle lens. That is, when the spectacle lens is a multifocal lens (for example, a bifocal lens, a progressive multifocal lens, or the like), the region GA may be set in a region corresponding to the presentation distance. Then, a simulation image may be generated based on the second distribution data and the first distribution data in the set area GA.

  The table of FIG. 7 exemplifies a method of setting the region GA in the case of the progressive multifocal lens when the target distance of the target is switched to “far”, “near”, and “intermediate” values. . That is, if the target presentation distance is “far”, the area GA is set to the distance point, and if the target presentation distance is “near”, the area GA is set to the near point. Furthermore, when the target presentation distance is “intermediate”, the area GA is set in the progressive zone. In each case, a simulation image corresponding to the set area GA is generated.

  Further, for example, in the measurement by the wavefront sensor, a plurality of first distribution data measured with different fixation target presentation positions may be stored in the memory 31. At this time, the accommodation power of the eye to be examined may be measured together. For the simulation, the degree of use of the first distribution data obtained with the use ratio of the adjustment power with respect to the presentation distance of each target such as “distance”, “near”, “intermediate”, etc. It may be set as appropriate. For example, the first distribution data having a larger use rate of the adjustment force as the presentation distance approaches may be used.

  The table in FIG. 8 exemplifies a method for selecting the first distribution data when the target presentation distance is switched to “far”, “near”, and “intermediate”. For example, when the target distance of the target is “far”, the first distribution data based on the measurement of the eye E in a state where the adjustment force is not working is selected, and the target distance of the target is “near” In the case where the first distribution data based on the measurement of the eye E under the condition that the adjustment force of a predetermined ratio is applied is selected and the presentation distance of the target is “intermediate”, The first distribution data based on the measurement of the eye E with the adjustment force applied may be selected, and a simulation image may be generated.

    Further, as shown in FIG. 9, the CPU 30 may generate a plurality of simulation images having different target presentation distances and display them in a list on the monitor 50 in association with the presentation distances related to the respective simulations. Good. FIG. 9 is a display example of a list display of simulation images in which the line-of-sight passage region and the target presentation distance are different from each other. By performing such a list display, the examiner can easily understand from various perspectives about how the eye to be inspected with the spectacle lens worn.

  Further, information indicating the relative positional relationship between the spectacle lens and the eye E may be displayed on the monitor 50 simultaneously with the simulation image. For example, in FIGS. 5 and 10, an index EP indicating an eye position is shown on the lens graphic LG. In addition to this, the information indicating the relative positional relationship between the spectacle lens and the eye E may be the line-of-sight passage position in the correction lens, the corneal vertex distance (VD), the line-of-sight direction with respect to the correction lens, and the like. Good. These pieces of information may be displayed graphically, may be displayed as text such as letters and numerical values, or may be displayed by other methods. FIG. 10 shows a specific example of graphics other than lens graphics. The side graphic SG indicates a positional relationship when the eye to be examined and the correction lens are viewed from the side, and may be such a graphic. The line of sight, the warp angle of the spectacle frame, the corneal apex distance, the eye height relative to the spectacle lens, and the like are shown.

  Further, in the simulation image, the appearance when the eye E and the spectacle lens are placed in a certain positional relationship is simulated, but the positional relationship between the eye E and the spectacle lens in the simulation is a plurality of different positions. The relationship may be settable. In other words, for example, the positional relationship between the eye E and the spectacle lens considered in generating the simulation image may be changeable according to various instructions. Then, each time a change is made, a simulation image based on the changed positional relationship may be generated and displayed.

  An instruction for changing the positional relationship between the eye E and the spectacle lens in the simulation may be received by the CPU 30 based on an operation input to the operation unit 40, for example. A specific example is shown with reference to FIG. Here, a specific example is shown in which the above instruction is received via a graphic displayed on the monitor 50 to indicate the positional relationship between the eye E to be examined and the spectacle lens. For example, the instruction may be received through either the lens graphic LG or the side graphic SG. For example, by using a pointing device (an example of the operation unit 40), an index or an icon related to an eye point on the monitor 50 (for example, an index EP indicating an eye position, an eyeball B, or a lens L is selected and moved). Thus, the position of the index EP or the like may be changed according to the operation, and a simulation image corresponding to the changed positional relationship may be displayed. The warp angle of the frame or the like may be changed by an operation of moving any index or icon, and a simulation image based on the changed parameter may be generated. Even if the initial value of the parameter to be measured is, for example, a measured value measured by the eye position meter 300 or the like In addition, even after the parameter is changed, information indicating the initial value may be displayed on the monitor 50.

  As described above, the present apparatus 1 can be simulated by changing the positional relationship between the eye E and the spectacle lens, and for example, the following effects can be expected. That is, when prescribing a new lens for the eye to be examined, the examiner can easily grasp the arrangement of the spectacle lens with respect to the eye to be examined with which a suitable appearance can be obtained based on the simulation image. As a result, the examiner can easily grasp which of the new lens candidates is appropriate.

  The simulation image may take into account the style Crawford phenomenon. It is known that the greater the incident angle of light to the fundus, the lower the sensitivity of the photoreceptor cells (the first type Crawford phenomenon). By taking this phenomenon into account, simulation images can be obtained from actual subjects. It can be closer to how it looks. For example, when generating a simulation image, image data of a target image on which a point image intensity distribution (PSF) or a result of Fourier transform thereof is superimposed has a lower brightness and contrast in advance in the vicinity of the target image. It may be image data. Such image data may be stored in the memory 31 in advance. Instead of this, the CPU 30 corrects the target image (simulation image) generated based on the first distribution data and the second distribution data so that the luminance and contrast become lower toward the periphery of the target image. Processing may be performed. When a simulation image in which the style Crawford phenomenon is taken into consideration is displayed on the monitor 50, a graphic for indicating the influence of the style Crawford phenomenon may be displayed together with the simulation image. As an example, in FIG. 10, a graph SC showing the sensitivity distribution in the transverse direction of the eye is displayed.

  In addition, the CPU 30 may calculate an index (specifically, an evaluation parameter) representing the quality of appearance when wearing the spectacle lens based on the first distribution data and the second distribution data. Then, the CPU 30 may display the evaluation parameter on the monitor 50 together with the simulation image. Examples of evaluation parameters include Strehl ratio, RMS value of wavefront aberration of the entire eye to be examined, phase shift (PTF), spatial frequency characteristics (MTF), and the like.

  Further, the CPU 30 extracts the distribution data (uncorrectable distribution data) of the uncorrectable spectacles component from the distribution data (one aspect of the first distribution data) of the wavefront aberration in the eye E, and based on the uncorrectable distribution data. A simulation image may be generated as a comparative simulation image. The simulation image based on the uncorrectable distribution data is an image obtained by weighting the simulation image of the target image formed on the fundus of the normal eye with the uncorrectable component data. The comparison simulation image may be displayed on the monitor 50 together with the simulation image. Here, the uncorrectable distribution data represents a higher-order (mainly third-order or higher) aberration distribution that is an aberration component that cannot be corrected by the spectacle lens. For this reason, the comparative simulation image generated based on the uncorrectable distribution data can be used as a benchmark for the appearance when the spectacle lens is worn. It should be noted that the display relating to the component that cannot correct glasses is not limited to the comparative simulation image. For example, a value indicating the magnitude of the uncorrectable component (for example, information such as the amount of high-order aberration and RMS (square mean sum of errors of measured values with respect to the approximate diopter curve in the circumferential direction)) is displayed on the monitor 50. May be.

  As described above, the description has been given based on the embodiment, but the present disclosure is not limited to the above embodiment, and various modifications are possible.

  For example, in the above-described embodiment, a case where information relating to the refractive power distribution at the line-of-sight passage position (that is, the second distribution data in the region GA) is used as the correction lens power information used when generating the simulation image. Illustrated. However, the correction lens power information at the line-of-sight position need not be distribution information having data at a plurality of extraction points. For example, frequency information uniquely determined with respect to the line-of-sight passage position may be used. For example, when the measurement data of the lens meter 200 or the design value data of the spectacle lens is data such that the frequency is assigned to each of the regions in which the spectacle lens is divided into one or more, This modification may be applied.

  In the above-described embodiment, a case where a simulation image is generated as correction result information, which is information indicating how the eye is viewed based on the third distribution data and indicating correction results by the spectacle lens. Although illustrated, it is not necessarily limited to this. For example, a map image representing the third distribution data as a map may be generated by the CPU 30 as the correction result information (for example, the map shown in FIG. 3). Further, the correction result information may be other graphics, texts, numerical values, and the like.

1 glasses prescription assistance device 30 CPU
31 Memory (memory)
50 monitors

Claims (21)

The measurement data of the eye to be examined by the wavefront sensor, generated based on the first distribution data regarding the refractive error distribution of the eye to be examined and the frequency information in a part of the spectacle lens for correcting the refractive error of the eye to be examined. Simulation image acquisition means for acquiring a simulation image obtained by simulating a target image formed on the fundus of the eye to be examined in which the eyeglass lens is worn;
Display control means for displaying on the monitor position information indicating the position of the part corresponding to the simulation image in the eyeglass lens together with the simulation image acquired by the simulation image acquisition means,
An eyeglass prescription assisting device.   The spectacles prescription assisting apparatus according to claim 1, wherein the display control unit displays a lens graphic imitating a spectacle lens on the monitor, and superimposes an index indicating the position of the part as the position information on the lens graphic.   The spectacle prescription assisting apparatus according to claim 2, wherein the display control means displays the lens graphic including a characteristic part graphic for indicating a characteristic part in the spectacle lens.   4. The feature point graphic is a graphic for specifying any one of a distance point, a near point, and a progressive band when the spectacle lens is a progressive multifocal lens. The spectacles prescription assistance apparatus of description.   5. The spectacle prescription assisting apparatus according to claim 4, wherein the characteristic location graphic is a map in which regions are divided for each frequency on the spectacle lens. The simulation image acquisition means acquires at least the simulation image generated based on frequency information at an eye point that is a position of the eye to be examined with respect to the spectacle lens when the spectacle lens is worn,
The eyeglass prescription assisting apparatus according to claim 1, wherein the display control unit displays information indicating the eye point on the monitor as the position information. The simulation image acquisition means acquires a plurality of the simulation images corresponding to a plurality of the partial positions different from each other for one spectacle lens,
The glasses prescription assisting device according to any one of claims 1 to 6, wherein the display control means displays a plurality of simulation images having different partial positions on the monitor in association with positional information on each simulation image. apparatus.   The spectacles prescription assisting device according to claim 7, wherein the display control means switches and displays one of a plurality of simulation images having different partial positions as the time elapses.   9. The spectacle prescription assisting apparatus according to claim 8, wherein the display control means performs switching display of the simulation image such that the part of the position is shifted on the spectacle lens by eye rotation. The simulation image acquisition means acquires a plurality of the simulation images corresponding to a plurality of the partial positions along a progressive zone when the progressive multifocal lens is a spectacle lens,
10. The spectacle prescription assisting apparatus according to claim 9, wherein the display control means performs switching display of the simulation image such that the partial position is changed along the progressive zone. A presentation distance selection means for selecting a first presentation distance which is a presentation distance of a target relating to the target image;
The glasses prescription assisting device according to any one of claims 1 to 10, wherein the simulation image acquisition unit acquires the simulation image in consideration of the first presentation distance selected by the presentation distance selection unit. The simulation image acquisition means includes
When acquiring the simulation image when the spectacle lens is a multifocal lens, the part position is set according to the first presentation distance, and the part at the set part position is set. The spectacles prescription assistance apparatus of Claim 11 which acquires the said simulation image based on frequency information. The acquisition means stores a plurality of first distribution data measured with different second presentation distances, which are presentation distances of the fixation target in the wavefront sensor,
The simulation image acquisition means selects any one of the plurality of first distribution data according to a first presentation distance selected by the presentation distance selection means, and the selected first distribution data and the first distribution data The spectacles prescription assistance apparatus of Claim 11 or 12 which acquires the said simulation image based on presentation distance. The simulation image acquisition means acquires the plurality of simulation images having different first presentation distances,
The spectacles prescription assisting device according to any one of claims 11 to 13, wherein the display control means displays a plurality of the simulation images in a list on the monitor in association with the first presentation distance. Having an acquisition means for acquiring positional relationship information which is information indicating the positional relationship between the eyeglass lens and the eye to be examined;
The spectacle prescription according to any one of claims 1 to 14, wherein the simulation image acquisition means further acquires the simulation image in consideration of the positional relationship between the spectacle lens and the eye to be examined indicated by the positional relationship information. Auxiliary device. The measurement data of the eye to be examined by the wavefront sensor, the first distribution data regarding the distribution of the refraction error of the eye to be examined, and the partial power information which is the power information in a part of the spectacle lens for correcting the refraction error of the eye to be examined. Acquiring the positional relationship information, which is information regarding the positional relationship between the spectacle lens and the eye to be examined;
A simulation image of a target image formed on the fundus of the eye to be examined, the simulation image relating to the eye to be examined in a state where a spectacle lens is worn, the first distribution data, the partial frequency information, and the positional relationship Simulation image acquisition means for acquiring based on the information;
An eyeglass prescription assisting device. Comprising an instruction receiving means for receiving an instruction for changing a positional relationship between the eyeglass lens and the eye to be examined considered in the simulation image;
The glasses prescription assisting device according to claim 15 or 16, wherein the simulation image acquisition means acquires the simulation image in which the positional relationship after the change by the instruction is taken into consideration.   The eyeglass prescription assisting device according to claim 16, further comprising display control means for displaying, on the monitor, position information indicating the position of the part corresponding to the simulation image on the eyeglass lens together with the simulation image. The simulation image acquisition means further uses the uncorrectable distribution data, which is the distribution data of the uncorrectable component in the first distribution data, for the simulation image of the visual target image formed on the fundus of the normal eye. Obtain a comparative simulation image weighted by the uncorrectable component data,
The glasses prescription assisting apparatus according to any one of claims 1 to 14, and 18, wherein the display control means displays the comparative simulation image together with the simulation image on the monitor. An eyeglass prescription assisting program that is executed by a computer processor,
The measurement data of the eye to be examined by the wavefront sensor, generated based on the first distribution data regarding the refractive error distribution of the eye to be examined and the frequency information in a part of the spectacle lens for correcting the refractive error of the eye to be examined. A simulation image acquisition step of acquiring a simulation image in which a target image formed on the fundus in the eye to be examined is a simulation image,
A display control step for displaying on the monitor position information indicating the position of the part corresponding to the simulation image in the spectacle lens together with the simulation image acquired in the simulation image acquisition step;
Is executed by the computer. An eyeglass prescription assisting program that is executed by a computer processor,
The measurement data of the eye to be examined by the wavefront sensor, the first distribution data regarding the distribution of the refraction error of the eye to be examined, and the partial power information which is the power information in a part of the spectacle lens for correcting the refraction error of the eye to be examined. Acquiring the positional relationship information, which is information regarding the positional relationship between the eyeglass lens and the eye to be examined; and
A simulation image of a target image formed on the fundus of the eye to be examined, the simulation image relating to the eye to be examined in a state where a spectacle lens is worn, the first distribution data, the partial frequency information, and the positional relationship A simulation image acquisition step to acquire based on the information;
Is executed by the computer.