Setting system and setting method

Abstract

To reduce difference in brightness of hue by individual difference.SOLUTION: A setting system includes: a light stimulation generation part generating light stimulation of a plurality of colors inducing pupil light reflex; a camera capturing changes of pupil due to the light reflex induced by light stimulation of each color; and processing part which creates visual sense characteristics of a user from an image captured by the camera and outputs data showing transmittance of each color in a spectacle lens by using the created visual sense characteristics.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a setting system and a setting method.

Background Art

[0002] Glasses equipped with a filter that compensates for visual sensitivity characteristics due to aging effects are known (see, for example, Patent Document 1). Visual sensitivity characteristics are influenced by age as one factor, but even at the same age, they vary depending on various factors for each individual.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Means for Solving the Problems

[0004] According to a first aspect of the present disclosure, there is provided a setting system for spectacle lenses, comprising: a light stimulation generation unit that generates a plurality of colored light stimulations for inducing the pupillary light reflex; a camera that images changes in the pupil due to the pupillary light reflex induced by each colored light stimulation; and a processing unit that creates the visual sensitivity characteristics of a user from the image imaged by the camera and outputs data indicating the transmittance of each colored light in the spectacle lens using the created visual sensitivity characteristics.

[0005] According to a second aspect of the present disclosure, there is provided a design method for spectacle lenses, including: generating a plurality of colored light stimulations for inducing the pupillary light reflex; imaging, with a camera, changes in the pupil due to the pupillary light reflex induced by each colored light stimulation; creating the visual sensitivity characteristics of a user from the image imaged by the camera; and outputting data indicating the transmittance of each colored light in the spectacle lens using the created visual sensitivity characteristics.

Brief Description of the Drawings

[0006]

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Embodiments for Carrying Out the Invention

[0007] Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential for the solution means of the invention.

[0008] Before light enters the eye and reaches the pupil, it passes through the intraocular media in the order of the cornea, aqueous humor, lens, and vitreous body. Then, the information of the light that has reached the pupil is changed into an electrical signal by photoreceptor cells and is processed in two major pathways in the brain, causing a physiological effect.

[0009] It is known that the light transmittance of the lens decreases with aging, and the degree of attenuation depends on the wavelength (color) of light. Specifically, the light transmittance in the lens significantly decreases in the short-wavelength (blue light) region. Also, the pupil located on the front side (cornea side) of the lens plays a role in adjusting the amount of incident light, and it is known that the size of this pupil also contracts with aging (senile miosis).

[0010] As a result, the amount and quality of light reaching the pupil change with aging, but there are also effects due to differences in individual genetics and lifestyle differences. Also, the differences in the eye optical system due to age vary depending on individual differences.

[0011] The pupil reflex has a great relationship with the amount of incident light, and there are static characteristics when a certain amount of light is incident on the pupil and dynamic characteristics when the amount of incident light changes.

[0012] As static characteristics, there is almost a one-to-one relationship between the luminance of the light source at which the eye is gazing and the diameter of the pupil. This relationship has been experimented by many people such as Reeves and Crawford.

[0013] As a dynamic characteristic, for flash light, the diameter of the pupil first decreases and contracts to reach the minimum contraction diameter, and then gradually recovers to the original value. Also, the minimum contraction diameter varies depending on the luminance of the light source of the flash light. Such a pupil phenomenon is considered to be natural behavior because the pupil system operates to reduce the amount of light incident on the pupil.

[0014] Even if the light of the light source that the eye is gazing at has the same luminance but different wavelength bands, the relationship between the luminance of the light source that the eye is gazing at and the diameter of the pupil is not a one-to-one relationship due to differences in the visual sensitivity characteristics for individual colors. This is because individual differences are not considered in the spectral luminous efficiency used in the definition of luminance.

[0015] In this embodiment, when designing the spectacle lens, by considering the visual sensitivity characteristics for each individual color, it is possible to reduce the difference in the feeling of brightness due to differences in hue caused by individual differences. For example, the setting system and setting method of the spectacle lens according to this embodiment measure (including estimation) the visual sensitivity characteristics for each color from the difference in the wavelength of the pupillary light response by causing the subject to gaze at light stimuli having peaks of different wavelengths. Thereby, it becomes possible to provide appropriate brightness and color for that person.

[0016] FIG. 1 is a schematic configuration diagram of the setting system 1 according to this embodiment. The setting system 1 according to this embodiment includes a light stimulus generation unit 10, a camera 20, and an information processing device 30. For example, the setting system 1 is installed in a store of an optician's.

[0017] The light stimulation generation unit 10 generates light stimulations of various colors that induce the pupillary light reflex of the user by having the user fixate on them. The light stimulation generation unit 10 can generate light stimulations of multiple colors. Note that the light stimulation generation unit 10 does not generate light stimulations of multiple colors simultaneously, but selectively generates a light stimulation of any one color. For example, the light stimulation generation unit 10 generates a light stimulation of the color instructed by the information processing device 30 from among the light stimulations of multiple colors. In the example shown below, the multiple colors are three colors: red, green, and blue, but it is not limited to this, and there is no particular limitation as long as there are multiple colors.

[0018] The light stimulation is not particularly limited as long as it can induce the pupillary light reflex, but it is one or more of a stimulation that changes the light luminance one or more times, a stimulation that changes the chromaticity spatial frequency of the light one or more times, and a stimulation that changes the chromaticity temporal frequency of the light one or more times.

[0019] The light stimulation generation unit 10 includes, for example, a light source unit 11 and a liquid crystal element 12. The light source unit 11 includes a first monochromatic light source, a second monochromatic light source, and a third monochromatic light source. The light source unit 11 is, for example, an LED lighting device. Note that the liquid crystal element 12 is an example of an "optical filter". Another optical filter may be employed instead of the liquid crystal element 12. For example, each of the first monochromatic light source, the second monochromatic light source, and the third monochromatic light source emits monochromatic light in the visible light region between 380 nm and 780 nm.

[0020] The first monochromatic light source emits blue light. This blue light has a wavelength band distributed with a central wavelength of 450 nm as shown in, for example, FIG. 2. The second monochromatic light source emits green light. This green light has a wavelength band distributed with a central wavelength of 520 nm as shown in, for example, FIG. 3. The third monochromatic light source emits red light. This red light has a wavelength band distributed with a central wavelength of 655 nm as shown in, for example, FIG. 4. For example, at least two central wavelengths (the first wavelength and the second wavelength) among the first monochromatic light source, the second monochromatic light source, and the third monochromatic light source are included in the visible light region between 380 nm and 780 nm.

[0021] Among the first monochromatic light source, the second monochromatic light source, and the third monochromatic light source, which light source emits light is controlled by the information processing device 30. For example, one of the first monochromatic light source, the second monochromatic light source, and the third monochromatic light source is selected by the information processing device 30, and the selected light source emits light. In this way, the light source unit 11 emits only one arbitrary monochromatic light out of red light, green light, and blue light.

[0022] The liquid crystal element 12 generates a light stimulus using the monochromatic light incident from the light source unit 11. For example, the liquid crystal element 12 generates a light stimulus by changing one or more parameters (hereinafter referred to as "light stimulus parameters") among the luminance, chromaticity spatial frequency, and chromaticity temporal frequency of the monochromatic light incident from the light source unit 11. When a user gazes at light (light stimulus) in which one or more light stimulus parameters among the luminance, chromaticity spatial frequency, and chromaticity temporal frequency of the monochromatic light are changed n times by the liquid crystal element 12, n times of pupillary light reflex is induced in the pupil of the user. n is an integer of 1 or more, and 2 or more is desirable.

[0023] For example, when red light is incident from the light source unit 11, the liquid crystal element 12 generates a red light stimulus by changing one or more light stimulus parameters among the luminance, chromaticity spatial frequency, and chromaticity temporal frequency of the red light n times. For example, when green light is incident from the light source unit 11, the liquid crystal element 12 generates a green light stimulus by changing one or more light stimulus parameters among the luminance, chromaticity spatial frequency, and chromaticity temporal frequency of the green light n times.

[0024] For example, when blue light is incident from the light source unit 11, the liquid crystal element 12 generates a blue light stimulus by changing one or more light stimulus parameters among the luminance, chromaticity spatial frequency, and chromaticity temporal frequency of the blue light n times. The light stimulus is displayed, for example, on the display screen 121 of the liquid crystal element 12. Note that the display screen 121 is an example of a display unit.

[0025] For example, when the liquid crystal element 12 generates a light stimulus and changes the luminance of monochromatic light as a light stimulus parameter multiple times, the liquid crystal element 12 performs a process of generating flash lights with different luminances at predetermined intervals n times for each of red light, green light, and blue light.

[0026] As illustrated in FIG. 1, the liquid crystal element 12 is installed between the light source unit 11 and the user. As shown in FIG. 1, the light source unit 11 is disposed behind the liquid crystal element 12. In the example shown in FIG. 1, the light source unit 11 serves both as a function of a backlight of the liquid crystal element 12 and as a light source for generating a light stimulus. In the example shown in FIG. 1, the light stimulus is displayed in a predetermined area (hereinafter referred to as "gaze area") 122 on the display screen 121. In other words, the light stimulus is presented in the gaze area 122.

[0027] When the user gazes at the light stimulus presented in the gaze area 122 of the display screen 121, the user's pupillary light reflex is induced. Note that before the light stimulus is presented, content for notifying the user of the timing to gaze at the light stimulus may be displayed on the display screen 121. The timing to gaze at the light stimulus is the timing when the light stimulus is displayed in the gaze area 122.

[0028] FIG. 5 is a diagram showing an example of a display for notifying the timing to gaze at a light stimulus. The information processing apparatus 30 causes the display screen 121 to display a countdown display until the light stimulus is displayed in the gaze area 122, and notifies the timing to gaze at the light stimulus. Note that this countdown display is not essential. For example, the setting system 1 may notify the timing to gaze at the light stimulus by voice or orally.

[0029] The camera 20 images the changes in the pupil due to n times of pupillary light reflexes induced by light stimuli of various colors. In other words, the camera 20 captures the changes in the pupil due to n times of pupillary light reflexes induced by light stimuli of various colors as an image. The image may be a still image or a moving image. The camera 20 images the pupil at least from the start of the presentation of the light stimulus until the end of the presentation of the light stimulus on the display screen 121 at least.

[0030] Note that the camera 20 only needs to image at least one of the user's left and right pupils. The camera 20 is not particularly limited as long as it can image the user's pupil. As an example, it is a camera for eye tracking. The camera 20 is connected to the information processing device 30. The camera 20 transmits the captured image to the information processing device 30 by wire or wirelessly.

[0031] FIG. 6 is an example of the hardware configuration of the information processing device 30 according to the present embodiment. As shown in FIG. 6, the information processing device 30 includes a communication interface (hereinafter referred to as "communication I / F") 40, a display device 41, an input device 42, a storage device 43, and a processor 44.

[0032] The communication I / F 40 can communicate with the light source unit 11, the liquid crystal element 12, and the camera 20 by wire or wirelessly. The display device 41 displays various data. The display device 41 is, for example, a liquid crystal display or an organic EL (Electro Luminescence) display. For example, the display device 41 may include a touch panel type display screen.

[0033] The input device 42 is operable by the user and inputs data corresponding to the user's operation to the processor 44. The input device 42 includes, for example, hardware keys such as a touch panel, a touch display, a keyboard, a pointing device such as a mouse, and a microphone (operation input by voice).

[0034] The memory device 43 may include, for example, a non-volatile or volatile semiconductor memory (e.g., RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory)).

[0035] A program for designing spectacle lenses is installed in the memory device 43 from the captured images captured by the camera 20. Further, the memory device 43 stores data processed by the program and the like, images acquired from the camera 20, and the like.

[0036] The above program may be provided by a computer-readable storage medium which is a computer-readable recording medium. The above program is read from the computer-readable storage medium, installed in the memory device 43 which is also an example of a computer-readable storage medium, and executed by the processor 44. The above program may be in a form downloaded from an external device via a wired or wireless communication network. That is, the above program may be provided via a computer-readable storage medium or an electrical communication line such as a network.

[0037] Examples of computer-readable media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like. More specific examples of computer-readable media may include floppy (registered trademark) disks, diskettes, hard disks, random access memories (RAMs), read only memories (ROMs), erasable programmable read only memories (EPROMs or flash memories), electrically erasable programmable read only memories (EEPROMs), static random access memories (SRAMs), compact disk read only memories (CD-ROMs), digital versatile disks (DVDs), Blu-ray (RTM) disks, memory sticks, integrated circuit cards, and the like.

[0038] The processor 44 is a processor including one or more of, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), and an FPGA (Field-Programmable Gate Array).

[0039] By executing the above program stored in the storage device 43, the processor 44 controls various processes for designing spectacle lenses from the captured images of the camera 20. The processor 44 receives various data from the input device 42 or the communication I / F 40. The processor 44 performs some arithmetic processing based on the received data and displays the arithmetic result on the display device 41.

[0040] FIG. 7 is a functional block diagram of the processor 44 according to the present embodiment. As shown in FIG. 7, the processor 44 includes a control unit 50 and a processing unit 51. The control unit 50 and the processing unit 51 are realized, for example, when the above program stored in the storage device 43 is executed by the processor 44.

[0041] The control unit 50 controls the operation of the light source unit 11. The control unit 50 causes any one of the first monochromatic light source, the second monochromatic light source, and the third monochromatic light source to emit light. That is, the control unit 50 can control the light source unit 11 to emit any monochromatic light among red light, green light, and blue light.

[0042] The control unit 50 controls the display on the display screen 121. The control unit 50 controls the operation of the liquid crystal element 12 to change one or more parameters among the luminance, the chromaticity spatial frequency, and the chromaticity temporal frequency of the monochromatic light incident on the liquid crystal element 12. That is, the control unit 50 controls each of the luminance, the chromaticity spatial frequency, and the chromaticity temporal frequency of the light displayed in the fixation area 122 on the display screen 121.

[0043] The processing unit 51 includes a measurement unit 60, a data creation unit 61, and a calculation unit 62.

[0044] The measurement unit 60 acquires the images captured by the camera 20. Based on the images captured by the camera 20, the measurement unit 60 measures each feature amount of n times of pupillary light reflexes induced by the light stimulus of the user for each color light. The feature amount is, for example, numerical data related to the change of the pupil with respect to the light stimulus, and includes the numerical data before the pupillary light reflex and the numerical data changed by the pupillary light reflex. The numerical data is one or more of the maximum pupil diameter, the minimum pupil diameter, the speed of change from the maximum pupil diameter to the minimum pupil diameter, the time required for the change of the speed, the re-expansion speed, and the contraction of the pupil. The re-expansion speed is, for example, the change speed of the pupil diameter from the time of 10% re-expansion of the maximum pupil contraction rate to the time of 50% re-expansion.

[0045] The measurement unit 60 measures, for example, each feature amount of n times of pupillary light reflexes induced by the red light stimulus from the image of the pupil of the user who is gazing at the red light stimulus. The measurement unit 60 measures, for example, each feature amount of n times of pupillary light reflexes induced by the green light stimulus from the image of the pupil of the user who is gazing at the green light stimulus. The measurement unit 60 measures, for example, each feature amount of n times of pupillary light reflexes induced by the blue light stimulus from the image of the pupil of the user who is gazing at the blue light stimulus.

[0046] For example, when flash lights with different luminances (light stimulus parameters) are generated only 4 times at a predetermined interval as the light stimulus, the measurement unit 60 measures 4 feature amounts as the feature amounts of each luminance, that is, the features for each luminance, in each of the red light, the green light, and the blue light.

[0047] The data creation unit 61 creates a visual sensitivity characteristic indicating the sensitivity of the user to each color using the feature amounts of each color measured by the measurement unit 60. The visual sensitivity characteristic is a characteristic of visual sensitivity in bright light, and includes, for example, the light stimulus parameter characteristic of the feature amount for each color light (hereinafter referred to as the "feature amount - light stimulus characteristic"). The feature amount - light stimulus characteristic is a characteristic indicating how the feature amount changes as the light stimulus parameter changes.

[0048] For example, as the feature amount - light stimulus characteristic, the data creation unit 61 creates data associating the light stimulus parameter with the feature amount of the pupillary light reflex induced by the light stimulus. For example, the data creation unit 61 creates the feature amount - light stimulus characteristic using the feature amounts (n feature amounts) for each light stimulus parameter measured by the measurement unit 60. The feature amount - light stimulus characteristic may be some function or a correspondence table. The function includes an approximation formula approximating the feature amounts for each light stimulus parameter measured by the measurement unit 60. Also, the correspondence table may be data representing the feature amounts for each light stimulus parameter measured by the measurement unit 60 in a table format.

[0049] The calculation unit 62 calculates the transmittance of each color light in the spectacle lens using the visual sensitivity characteristic generated by the data creation unit 61. For example, the calculation unit 62 calculates the transmittance of the spectacle lens that corrects the feature amount of the pupil to change to approximately the same magnitude for the light stimuli of red light, green light, and blue light having the same light stimulus parameter (e.g., luminance) as each other. As an example, the calculation unit 62 calculates the transmittance of each color light in the spectacle lens of the spectacle such that the difference between each of the feature amount - light stimulus characteristics of red light, green light, and blue light created by the data creation unit 61 disappears when the spectacle is worn.

[0050] The calculation unit 62 outputs data indicating the calculated transmittance of each color light. The data indicating the transmittance may be data of the transmittance or data indirectly indicating the transmittance. The calculation unit 62 may display the data indicating the calculated transmittance of each color light on the display device 41, or may output it to another display device or an external device. The external device is a device capable of wired or wireless communication with the information processing device 30, and examples thereof include a PC (including a notebook personal computer), a server, a mobile phone, a smartphone, a tablet terminal, and a wearable terminal.

[0051] Hereinafter, a specific example of the first setting method of the transmittance according to the present embodiment will be described. FIG. 8 is a flowchart of the first setting method according to the present embodiment.

[0052] There is a desire to use spectacle lenses that match one's own visual sensitivity characteristics. A user (hereinafter referred to as the "subject") visits an optical store where the setting system 1 according to the present embodiment is introduced in order to purchase spectacle lenses that match their own visual sensitivity characteristics.

[0053] As shown in FIG. 1, in the room where the imaging of the pupil is performed (hereinafter simply referred to as the "room"), a chin rest 100 is installed so that the subject can gaze at the light stimulus generated on the display screen 121 for a certain period of time. When the subject enters the room, the face of the subject is fixed to the chin rest 100. Then, the height of the chin rest is set so that the position of the eyes in the state where the face of the subject is fixed to the chin rest 100 and the center of the gazing area 122 of the display screen 121 are at the same height. Also, the distance between the chin rest 100 and the display screen 121 is set to a predetermined distance. The illuminance inside the room is controlled to be constant.

[0054] First, the setting system 1 determines whether the pupil diameter of the subject is stable (hereinafter referred to as "stabilization confirmation process").) (Step S101). For example, the setting system 1 displays some kind of mark on the display screen 121. The store clerk at the optician's tells the subject to look at the mark on the display screen 121. The setting system 1 starts the stabilization confirmation process in step S101 when a certain trigger is input while a certain mark is being displayed on the display screen 121. A certain trigger is, for example, when an operation for instructing the start of the stabilization confirmation process is performed by the input device 42.

[0055] When the stabilization confirmation process is started, the camera 20 starts imaging the pupil of the subject fixed to the jaw rest 100 and sequentially transmits the captured image to the information processing device 30. The information processing device 30 obtains the amount of change in the pupil diameter of the subject per predetermined time from the captured image received from the camera 20 at regular intervals.

[0056] The information processing device 30 determines whether the amount of change in the pupil diameter is less than the threshold value, and determines that the pupil diameter of the subject is stable if the amount of change is less than the threshold value one or more times. Note that the method for determining whether the pupil diameter of the subject is stable is not limited to the above method, and various methods can be adopted. Also, if the time the subject stays in the room exceeds the specified time, it may be regarded that the pupil diameter of the subject is stable and the process in step S101 may be omitted.

[0057] In the stabilization confirmation process, when it is confirmed that the pupil diameter of the subject is stable, the control unit 50 starts imaging the pupil of the subject by the camera 20 when the display of the countdown until the start of the light stimulus is started on the display screen 121 (Step S102). When the countdown is completed, the control unit 50 starts displaying the light stimulus in the fixation area 122 (Step S103). The fixation area 122 is, for example, a circular shape with a diameter of about 10 cm.

[0058] In the example shown below, the case where the light stimulation parameter is luminance will be described as an example. The light stimulation is performed, for example, by emitting flash lights with different luminances at a predetermined interval n times. The emission time of the flash light is, for example, 0.2 seconds per emission. Also, the above-mentioned predetermined interval, that is, the emission interval (non-emission time) of the flash light is, for example, 10 seconds. Note that, out of the 10 seconds from the end of the emission until the start of the next emission, it is desirable to refrain from blinking as much as possible during the first 2 seconds (2 seconds from the end of the emission).

[0059] For example, the control unit 50 sets the luminance values of the flash lights to be emitted at a predetermined time interval as Lu1, Lu2, Lu3, Lu4, Lu5, Lu6 in this order (n = 6) as the light stimulation. This setting is the same for each of the light stimulations of blue light (hereinafter referred to as "blue light stimulation"), green light (hereinafter referred to as "green light stimulation"), and red light (hereinafter referred to as "red light stimulation").

[0060] The control unit 50 displays on the fixation area 122 in the order of blue light stimulation, green light stimulation, and red light stimulation. That is, the control unit 50 performs the display of the blue light stimulation on the fixation area 122 as the first step, then performs the display of the green light stimulation on the fixation area 122 as the second step, and then performs the display of the red light stimulation on the fixation area 122 as the third step.

[0061] FIG. 9 is a diagram for explaining the blue light stimulation performed in the first step. FIG. 10 is a diagram for explaining the green light stimulation performed in the second step. FIG. 11 is a diagram for explaining the red light stimulation performed in the third step. "B" in FIG. 9 indicates that it is blue light. "G" in FIG. 10 indicates that it is green light. "R" in FIG. 11 indicates that it is red light. Specific examples of the first step, the second step, and the third step are shown below.

[0062] (First step Sb: FIG. 9) Start → Blue flash light with luminance Lu1 → Turn off (for 10 seconds) → Blue flash light with luminance Lu2 → Turn off (for 10 seconds) → Blue flash light with luminance Lu3 → Turn off (for 10 seconds) → Blue flash light with luminance Lu4 → Turn off (for 10 seconds) → Blue flash light with luminance Lu5 → Turn off (for 10 seconds) → Blue flash light with luminance Lu6 → Turn off (for 10 seconds) → Second step

[0063] (Second step Sg: Figure 10) Start → Green flash light with luminance Lu1 → Turn off (for 10 seconds) → Green flash light with luminance Lu2 → Turn off (for 10 seconds) → Green flash light with luminance Lu3 → Turn off (for 10 seconds) → Green flash light with luminance Lu4 → Turn off (for 10 seconds) → Green flash light with luminance Lu5 → Turn off (for 10 seconds) → Green flash light with luminance Lu6 → Turn off (for 10 seconds) → Proceed to the third step

[0064] (Third step Sr: Figure 11) Start → Red flash light with luminance Lu1 → Turn off (for 10 seconds) → Red flash light with luminance Lu2 → Turn off (for 10 seconds) → Red flash light with luminance Lu3 → Turn off (for 10 seconds) → Red flash light with luminance Lu4 → Turn off (for 10 seconds) → Red flash light with luminance Lu5 → Turn off (for 10 seconds) → Red flash light with luminance Lu6 → Turn off (for 10 seconds) → End

[0065] In addition, when the control unit 50 regards the execution of the first step, the second step, and the third step as one set of light stimuli, the control unit 50 may execute one set of light stimuli multiple times. The control unit 50 may execute one set of light stimuli only once. That is, as long as the changes in the pupil for each of the blue light stimulus, the blue light stimulus, and the red light stimulus can be imaged, there is no particular problem regarding how many times one set of light stimuli is repeated. Figure 12 is a diagram schematically showing the case where one set of light stimuli is executed three times. In addition, the control unit 50 may display a countdown of the time from the end of the lighting of the flash light until the next flash light is lit on the display screen 121.

[0066] The camera 20 always captures images of the subject's pupils by the camera 20 while the light stimulation is being performed, and sequentially transmits the captured images to the information processing device 30. When the display of all the light stimulations is completed, the information processing device 30 completes the imaging by the camera 20.

[0067] The processing unit 51 acquires the captured image captured by the camera 20 (step S104). The processing unit 51 obtains the change over time of the pupil diameter in each color light from the acquired captured image. In other words, the processing unit 51 obtains the change over time of the pupil diameter changed by the blue light stimulation, the change over time of the pupil diameter changed by the green light stimulation, and the change over time of the pupil diameter changed by the red light stimulation from the captured image captured by the camera 20, respectively (step S105).

[0068] For example, the processing unit 51 obtains the change over time of the pupil diameter changed by the blue light stimulation by reading the pupil diameter shown in each captured image obtained in the first step. The processing unit 51 obtains the change over time of the pupil diameter changed by the green light stimulation by reading the pupil diameter shown in each captured image obtained in the second step. The processing unit 51 obtains the change over time of the pupil diameter changed by the red light stimulation by reading the pupil diameter shown in each captured image obtained in the first step.

[0069] FIG. 13 is a graph plotting the change over time of the pupil diameter changed by the blue light stimulation. In the graph of the change over time of the pupil diameter shown in FIG. 13, the waveform 70 shows that (a) is the pupillary light reflex for the flash light of luminance Lu1, (b) is the pupillary light reflex for the flash light of luminance Lu2, (c) is the pupillary light reflex for the flash light of luminance Lu3, (d) is the pupillary light reflex for the flash light of luminance Lu4, (d) is the pupillary light reflex for the flash light of luminance Lu5, and (e) is the pupillary light reflex for the flash light of luminance Lu6. FIG. 14 is an enlarged view of the change in the pupil diameter for the flash light of luminance Lu1 shown in (a).

[0070] The temporal change in the pupil diameter calculated by the processing unit 51 includes noise due to short-wavelength fluctuations and noise due to blinking. Therefore, the processing unit 51 applies a low-pass filter to the temporal change in the pupil diameter for each color light calculated in step S105 to remove the above noise. FIG. 15 is a diagram showing the temporal change of (a) in FIG. 14 from which the above noise has been removed.

[0071] FIG. 16 is a diagram obtained by cutting out the region surrounded by the dotted line in FIG. 15. FIG. 16 shows a part of a plurality of physical quantities that are candidates for feature amounts. The example described below will be described by taking the case where the minimum pupil diameter (minimum pupil radius) is set as the feature amount. The processing unit 51 measures the minimum pupil diameter for each luminance from the temporal change in the pupil diameter after the low-pass filter (step S106). In step S106, the processing unit 51 measures the minimum pupil diameter for each color light at each luminance. That is, the processing unit 51 measures the minimum pupil diameter for each color light in each of (a), (b), (c), (d), (e), and (f). FIG. 17 is a diagram showing the minimum pupil diameter for each luminance measured in step S106 in a table format.

[0072] Here, when the camera 20 images the left and right pupils, the processing unit 51 may average the left and right minimum pupil diameters for each luminance. Further, for example, when one set of light stimuli is repeated three times as described above, the processing unit 51 may average the minimum pupil diameters for each luminance in each set. For example, when one set of light stimuli is repeated three times in the left and right eyes, the processing unit 51 averages, for example, six minimum pupil diameters that are the left and right minimum pupil diameters for three sets at the luminance Lu1, and uses the average value as the feature amount of the luminance Lu1.

[0073] The processing unit 51 obtains the visual sensitivity characteristics of each color using the measured minimum pupil diameter of each color light (step 107). The visual sensitivity characteristics are, for example, the luminance characteristics of the minimum pupil diameter in each of blue light, green light, and red light. The luminance characteristic of the minimum pupil diameter represents the relationship between the minimum pupil diameter and the luminance, and is an example of the above feature amount - light stimulus characteristic.

[0074] The processing unit 51 calculates the luminance characteristics of the minimum pupil diameter by obtaining the relational expression between luminance and the minimum pupil diameter from the measured minimum pupil diameter for each luminance. For example, the processing unit 51 obtains, as the relational expression, a function that approximates the measured minimum pupil diameter for each luminance. The above function in which luminance and the minimum pupil diameter are variables is, for example, a function f related to Weber-Fechner's law stating that the sensation quantity is proportional to the logarithm of the stimulus. In Weber-Fechner's law, it is assumed that the brightness Y perceived by a human has the following relationship with the stimulus X. Here, the stimulus X corresponds to the luminance, and Y corresponds to the minimum pupil diameter.

[0075]

Number

[0076] In the function (1), k and C are constants. The constants k and C are determined by the sensitivity of an individual to light. The processing unit 51 calculates a function fB indicating the luminance characteristics of the minimum pupil diameter for blue light by obtaining the coefficients k1 and C1 for blue light from the measured minimum pupil diameters (Lu1, Mb1), (Lu2, Mb2), (Lu3, Mb3), (Lu4, Mb4), (Lu5, Mb5), (Lu6, Mb6) for each of the six measured luminances.

[0077]

Number

[0078] The processing unit 51 calculates a function fG indicating the luminance characteristics of the minimum pupil diameter for green light by obtaining the coefficients k2 and C2 for green light from the measured minimum pupil diameters (Lu1, Mg1), (Lu2, Mg2), (Lu3, Mg3), (Lu4, Mg4), (Lu5, Mg5), (Lu6, Mg6) for each of the six measured luminances.

[0079]

Number

[0080] The processing unit 51 calculates a function fR that represents the luminance characteristics of the minimum pupil diameter for red light by obtaining the coefficients k3 and C3 of the red light from the measured minimum pupil diameters (Lu1, Mr1), (Lu2, Mr2), (Lu3, Mr3), (Lu4, Mr4), (Lu5, Mr5), and (Lu6, Mr6) for each of the six measured luminances.

[0081]

Number

[0082] FIG. 18 is a graph plotting the function fB. FIG. 19 is a graph plotting the function fG. FIG. 20 is a graph plotting the function fR. In FIGS. 18, 19, and 20, the white circles indicate the minimum pupil diameters for the respective measured luminances, and the black circles indicate the plots of the functions fB, fG, and fR.

[0083] FIG. 21 is a graph plotting the three functions fB, fG, and fR plotted in FIGS. 18, 19, and 20 on a single graph. In FIG. 21, the dotted line represents the luminance characteristics (function fB) of the minimum pupil diameter for blue light, the solid line represents the luminance characteristics (function fG) of the minimum pupil diameter for green light, and the dashed-dotted line represents the luminance characteristics (function fR) of the minimum pupil diameter for red light.

[0084] The processing unit 51 uses the functions fB, fG, and fR to determine the characteristics of the spectacle lenses for which the minimum pupil diameter changes to the same size in response to stimuli by red light, green light, and blue light having the same luminance. The characteristics of the spectacle lenses are, for example, the transmittance of each color light in the spectacle lenses.

[0085] The processing unit 51, for example, determines how much the stimulus X (luminance) of the function fB needs to be changed so that the function fB matches or substantially matches the function fG, with the function fG as a reference. Substantially matching does not mean complete matching and may be, for example, partial matching. The processing unit 51, for example, determines how much the stimulus X (luminance) of the function fR needs to be changed so that the function fR matches or substantially matches the function fG, with the function fG as a reference.

[0086] For example, as shown in FIG. 22, the processing unit 51 multiplies the stimulus X of the function (1) by 0.8 to obtain a solution that the function fB approximately matches the function fG, and multiplies the stimulus X of the function fR by 0.58 to obtain a solution that the function fR approximately matches the function fG. Therefore, as shown in FIG. 22, the function fB that approximately matches the function fG becomes the function fB', and the function fR that approximately matches the function fG becomes the function fG'.

[0087] These results indicate that by setting the transmittance for blue light to 80% and reducing the blue light entering the eye by 20%, and setting the transmittance for red light to 58% and reducing the red light entering the eye by 42%, the difference in brightness due to hue caused by individual differences can be reduced. That is, the processing unit 51 sets the transmittance of the subject's spectacle lens to 80% for blue light (450 nm), 100% for green light (520 nm), and 58% for red light (655 nm) (step S108). The processing unit 51 outputs data indicating the set transmittance of each color light to the display device 41, an external device, etc. (step S109).

[0088] Hereinafter, a specific example of the second setting method of the transmittance according to the present embodiment will be described. FIG. 23 is a flowchart of the second setting method according to the present embodiment. In FIG. 23, since step S201 and step S202 are the same processes as step S101 and step S102, detailed descriptions thereof are omitted.

[0089] In the second setting method, the light stimulus is, as in the first setting method, to emit flash lights with different luminances at a predetermined interval n times. However, the second setting method is different from the first setting method in terms of the number of luminances to be changed and the like. The light stimulus of the second setting method will be described below.

[0090] The control unit 50 sets the luminance values of the flash lights to be emitted at a predetermined time interval as Lw1, Lw2, Lw3, Lw4 in this order as the light stimulus of the second setting method. This setting is the same for each of the blue light stimulus, green light stimulus, and red light stimulus.

[0091] The control unit 50 displays a blue light stimulus, a green light stimulus, and a red light stimulus in this order in the fixation area 122. That is, the control unit 50 performs the display of the blue light stimulus in the fixation area 122 as the first step Tb, then performs the display of the green light stimulus in the fixation area 122 as the second step Tg, and then performs the display of the red light stimulus in the fixation area 122 as the third step Tr. FIG. 24 is a diagram for explaining the blue light stimulus performed in the first step Tb. FIG. 25 is a diagram for explaining the green light stimulus performed in the second step Tg. FIG. 26 is a diagram for explaining the red light stimulus performed in the third step Tr.

[0092] In each of the blue light stimulus, the green light stimulus, and the red light stimulus, the control unit 50 repeats a series of operations of changing the luminance values of the flash lights emitted at predetermined time intervals in the order of Lw1, Lw2, Lw3, and Lw4 a plurality of times. The repetition of this series of operations may be referred to as "repeated measurement".

[0093] (First step Tb: FIG. 24) Start → Blue flash light with luminance Lw1 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw2 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw3 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw4 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw1 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw2 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw3 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw4 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw1 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw2 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw3 → Turn off the light (for 10 seconds) → Blue flash light with luminance Lw4 → Turn off the light (for 10 seconds) → Go to the second step Tg

[0094] (Second step Tg: FIG. 25) Start → Green flash light with luminance Lw1 → Lights out (for 10 seconds) → Green flash light with luminance Lw2 → Lights out (for 10 seconds) → Green flash light with luminance Lw3 → Lights out (for 10 seconds) → Green flash light with luminance Lw4 → Lights out (for 10 seconds) → Green flash light with luminance Lw1 → Lights out (for 10 seconds) → Green flash light with luminance Lw2 → Lights out (for 10 seconds) → Green flash light with luminance Lw3 → Lights out (for 10 seconds) → Green flash light with luminance Lw4 → Lights out (for 10 seconds) → Green flash light with luminance Lw1 → Lights out (for 10 seconds) → Green flash light with luminance Lw2 → Lights out (for 10 seconds) → Green flash light with luminance Lw3 → Lights out (for 10 seconds) → Green flash light with luminance Lw4 → Lights out (for 10 seconds) → To the third step Tr

[0095] (Third step Tr: Figure 26) Start → Red flash light with luminance Lw1 → Lights out (for 10 seconds) → Red flash light with luminance Lw2 → Lights out (for 10 seconds) → Red flash light with luminance Lw3 → Lights out (for 10 seconds) → Red flash light with luminance Lw4 → Lights out (for 10 seconds) → Red flash light with luminance Lw1 → Lights out (for 10 seconds) → Red flash light with luminance Lw2 → Lights out (for 10 seconds) → Red flash light with luminance Lw3 → Lights out (for 10 seconds) → Red flash light with luminance Lw4 → Lights out (for 10 seconds) → Red flash light with luminance Lw1 → Lights out (for 10 seconds) → Red flash light with luminance Lw2 → Lights out (for 10 seconds) → Red flash light with luminance Lw3 → Lights out (for 10 seconds) → Red flash light with luminance Lw4 → Lights out (for 10 seconds) → End

[0096] Note that the control unit 50 may display a countdown of the time from the end of the lighting of the flash light to the lighting of the next flash light on the display screen 121, in the same manner as the first setting method.

[0097] When the countdown starts, the control unit 50 starts imaging the subject's pupil by the camera 20 (step S202). When the countdown is completed, the display of the light stimulus in the fixation region 122 is started (step S203). The camera 20 always images the subject's pupil by the camera 20 while the light stimulus is being performed, and sequentially transmits the captured image to the control unit 50. When the display of all the light stimuli is completed, the control unit 50 completes the imaging by the camera 20.

[0098] The processing unit 51 acquires the captured image captured by the camera 20 (step S204). The processing unit 51 obtains the change over time of the pupil diameter in each color light from the acquired captured image (step S205). In other words, the processing unit 51 obtains the change over time of the pupil diameter changed by the blue light stimulus, the change over time of the pupil diameter changed by the green light stimulus, and the change over time of the pupil diameter changed by the red light stimulus from the captured image captured by the camera 20, respectively.

[0099] For example, the processing unit 51 obtains the change over time of the pupil diameter changed by the blue light stimulus by reading the pupil diameter shown in each captured image obtained in the first step. The processing unit 51 obtains the change over time of the pupil diameter changed by the green light stimulus by reading the pupil diameter shown in each captured image obtained in the second step. The processing unit 51 obtains the change over time of the pupil diameter changed by the red light stimulus by reading the pupil diameter shown in each captured image obtained in the third step.

[0100] FIG. 27 is a diagram in which the change over time of the pupil diameter changed by the blue light stimulus is plotted on a graph. In FIG. 27, the pupil diameter changes of (g)(k)(o) are the pupillary light reflexes to the flash light of luminance Lw1, the pupil diameter changes of (h)(l)(p) are the pupillary light reflexes to the flash light of luminance Lw2, the pupil diameter changes of (i)(m)(q) are the pupillary light reflexes to the flash light of luminance Lw3, and the pupil diameter changes of (j)(n)(r) are the pupillary light reflexes to the flash light of luminance Lw4.

[0101] Similar to the first setting method, the processing unit 51 applies a low-pass filter to the temporal change of the pupil diameter in each color light calculated in step S205 to remove the above noise. Then, the processing unit 51 obtains the minimum pupil diameter for each luminance from the temporal change of the pupil diameter after the low-pass filter for each of blue light, green light, and red light (step S206).

[0102] For example, the processing unit 51 calculates, as the minimum pupil diameter of luminance Lw1, the value obtained by averaging the minimum pupil diameters of the three pupil diameter changes (g)(k)(o) of luminance Lw1. For example, the processing unit 51 calculates, as the minimum pupil diameter of luminance Lw2, the value obtained by averaging the three pupil diameter changes (h)(l)(p) of luminance Lw2.

[0103] For example, the processing unit 51 measures, as the minimum pupil diameter of luminance Lw3, the value obtained by averaging the three pupil diameter changes (i)(m)(q) of luminance Lw3. For example, the processing unit 51 measures, as the minimum pupil diameter of luminance Lw4, the value obtained by averaging the minimum pupil diameters of the three pupil diameter changes (j)(n)(r) of luminance Lw4.

[0104] Note that when calculating the minimum pupil diameter, if using the pupil diameters of both the left and right eyes instead of just one eye, the processing unit 51, for example, for each of luminance Lw1, luminance Lw2, luminance Lw3, and luminance Lw4, sets the value obtained by averaging the six minimum pupil diameters obtained by left-right and three repeated measurements as the minimum pupil diameter for each luminance.

[0105] FIG. 28 is a diagram showing the calculation results of the minimum pupil diameter for each luminance in blue light. FIG. 29 is a diagram showing the calculation results of the minimum pupil diameter for each luminance in green light. FIG. 30 is a diagram showing the calculation results of the minimum pupil diameter for each luminance in red light.

[0106] The processing unit 51 obtains the visual sensitivity characteristics of each color using the measured minimum pupil diameter of each color light (step S207). For example, the processing unit 51 calculates the luminance characteristics of the minimum pupil diameter by obtaining the relational expression between luminance and the minimum pupil diameter from the calculated minimum pupil diameter of each luminance. For example, the processing unit 51 obtains a function that approximates the measured minimum pupil diameter of each luminance as the relational expression. The processing unit 51 uses the following function model D of the Moon and Spencer Model as the function that approximates the minimum pupil diameter of each luminance.

[0107]

Equation

[0108] The Moon and Spencer Model is the most commonly used function model that measures the average pupil size with respect to the light intensity by having a light source in front of the subject's eyes and deriving it from the measured values. This function model determines each constant from the average value of the experimental values.

[0109] In the second setting method, among the constant parts of the function model D, a function model in which each of the two constants of 0.40 and 0.5 is replaced with variables m and n as shown in the following function model Dx is used as the function that approximates the minimum pupil diameter of each luminance. As a result, it becomes possible to freely represent the curve between a pupil diameter of 2 mm and 8 mm.

[0110]

Equation

[0111] The processing unit 51 calculates a function model Db that shows the luminance characteristics of the minimum pupil diameter in blue light by obtaining the coefficients m1 and n1 of the function model MD of blue light from the minimum pupil diameters (Lw1, Ub1), (Lw2, Ub2), (Lw3, Ub3), and (Lw4, Ub4) for the four luminances of blue light shown in FIG. 28.

[0112]

Equation

[0113] The processing unit 51 calculates a function model Dg showing the luminance characteristics of the minimum pupil diameter for green light by obtaining the coefficients m2 and n2 of the function model MD for green light from the minimum pupil diameters (Lw1, Ug1), (Lw2, Ug2), (Lw3, Ug3), and (Lw4) for the four luminance levels of green light shown in FIG. 29.

[0114]

Number

[0115] The processing unit 51 calculates a function model Dr showing the luminance characteristics of the minimum pupil diameter for red light by obtaining the coefficients m3 and n3 of the function model MD for red light from the minimum pupil diameters (Lw1, Ur1), (Lw2, Ur2), (Lw3, Ur3), and (Lw4) for the four luminance levels of red light shown in FIG. 30.

[0116]

Number

[0117] FIG. 31 is a graph plotting the function model Db. FIG. 32 is a graph plotting the function model Dg. FIG. 33 is a graph plotting the function model Dr. In FIGS. 31, 32, and 33, the white circles indicate the minimum pupil diameters for the respective measured luminances, and the black circles indicate the plots of the function models Db, Dg, and Dr.

[0118] FIG. 34 is a graph plotting the three function models Db, Dg, and Dr plotted in FIGS. 31 to 33 on one graph. From the results shown in FIG. 34, it can be seen that as the luminance increases, the pupillary light reflex for red light is larger than that for other colors. Also, similarly, it can be seen that blue is slightly larger than green. In FIG. 34, the dotted line represents the luminance characteristics (Db) of the minimum pupil diameter for blue light, the solid line represents the luminance characteristics (Dg) of the minimum pupil diameter for green light, and the dashed-dotted line represents the luminance characteristics (Dr) of the minimum pupil diameter for red light.

[0119] The processing unit 51 uses the function models Db, Dg, and Dr to obtain the characteristics of the spectacle lens for which the minimum pupil diameter changes to the same size in response to stimuli with red light, green light, and blue light having the same luminance. The characteristics of the spectacle lens are, for example, the transmittance of each color light in the spectacle lens.

[0120] For example, in the graph shown in FIG. 34, the luminance is 10 0 to 10 1 In the interval up to, the minimum pupil diameters of blue light, green light, and red light respectively are almost the same. Therefore, in the interval where the luminance is from 10 0 to 10 1 the transmittance of the lens for each of blue light, green light, and red light may be 100%.

[0121] When the luminance is from 10 1 to 10 2 and in the interval from 10 2 to 10 3 the graphs of the minimum pupil diameters of blue light and red light are shifted. Therefore, for example, it is possible to provide a lens that can reduce the difference in brightness due to the hue caused by individual differences by adjusting the transmittance of the spectacle lens for blue light, green light, and red light.

[0122] For example, as shown in FIG. 35, the processing unit 51 sets the transmittance for blue light to 90% to reduce the blue light entering the eyes by 10%, sets the transmittance for green light to 90% to reduce the green light entering the eyes by 10%, and sets the transmittance for green light to 70% to reduce the green light entering the eyes by 30% as the characteristics of the spectacle lens in the light environment in the range from 10 1 to 10 2 (step S208). The processing unit 51 outputs data indicating the set transmittance of each color light to the display device 41, an external device, or the like (step S209). This shows that it is possible to reduce the difference in the feeling of brightness due to the difference in hue caused by individual differences with the spectacle lens.

[0123] In addition, as shown in FIG. 36, the processing unit 51 sets the transmittance for blue light to 90% to reduce the blue light entering the eyes by 10%, sets the transmittance for green light to 90% to reduce the green light entering the eyes by 10%, and sets the transmittance for green light to 60% to reduce the green light entering the eyes by 40% as the characteristics of the spectacle lens in the light environment within the range from 10 2 to 10 3 . The processing unit 51 outputs data indicating the set transmittance of each color light to the display device 41, an external device, etc. (step S209). This shows that the spectacle lens can reduce the difference in brightness due to the hue caused by individual differences.

[0124] Here, in the light environment in the range from 10 1 to 10 2 and the light environment in the range from 10 2 to 10 3 , since the transmittances of all color lights do not match, two spectacle lenses corresponding to the respective light environments as shown in FIGS. 35 and 36 may be provided. Also, in order for one spectacle lens to correspond to two different light environments, a photochromic lens or an electrochromic lens may be used as the spectacle lens. This makes it possible to freely change the transmittance of each color of the lens in various light environments.

[0125] The number of people of all age groups who play games, watch movies, use SNS, etc. for a long time through the displays of smartphones, tablet terminals, and PCs is continuously increasing. Also, movies, games, etc. provide many images that place a greater burden on the eyes due to intense brightness changes and optical illusion effects in order to create more impactful images. Therefore, various guidelines are provided for distributed movies, TV, and games.

[0126] Since the environment for connecting to the Internet is available in various places, people are looking at images that are highly stimulating to vision for a long time in various environments such as dark night roads and crowded trains regardless of time and place. Therefore, the burden on the eyes is increasing.

[0127] The visible range in which the brightness of the human eye can be sensed is considered to be in the range of the wavelengths of light from approximately 380 to 780 nm. Also, the visual sensitivity characteristics for sensing the brightness of the human eye are not constant with respect to the wavelength of light, and there is a peak in sensitivity at approximately the center of the visible range (for example, a wavelength of 55 nm), gradually decreasing toward the short wavelength side or the long wavelength side.

[0128] Although it is known that the visual sensitivity characteristics vary slightly from person to person and also change with age, since there is a need to objectively and quantitatively evaluate brightness, standard spectral luminous efficiency has been defined as representing the average visual sensitivity characteristics of humanity.

[0129] In the principle of the current display system, the average visual sensitivity characteristics of humans are uniquely determined as a worldwide common standard. This is called a standard observer (or standard observer). In this standard observer, the "photometric standard observer" is used for the evaluation of "brightness", and the "colorimetric standard observer" is used for the evaluation of "color". The above-mentioned standard spectral luminous efficiency is regarded as one of the characteristics of the photometric standard observer.

[0130] It is suggested that all four types of photoreceptor cells are functioning at 4 weeks after birth. From this time, the visual sensitivity for color discrimination rapidly increases, but a gradual decrease in visual sensitivity is seen with a peak around the age of 20. Also, in the eye optical system of the elderly, visible light in the short wavelength region is easily absorbed, which is the cause of the decrease in visual sensitivity in the short wavelength region. Therefore, the visual sensitivity characteristics of the above-mentioned standard observer and those of an actual person are different.

[0131] In the present disclosure, by measuring the visual sensitivity characteristics of the human eye and calculating the difference from the worldwide common standard used in the above-mentioned display, it is possible to provide spectacle lenses capable of optical correction so as to have vision according to the standard while canceling out individual differences.

[0132] Note that the liquid crystal element 12 may have all of the functions of changing the luminance of monochromatic light, changing the chromaticity spatial frequency of the monochromatic light, and changing the chromaticity temporal frequency, or may have only any one of the functions. For example, when using only the luminance of monochromatic light as the light stimulation parameter, the liquid crystal element 12 does not necessarily have the function of changing the chromaticity spatial frequency and the function of changing the chromaticity temporal frequency.

[0133] The display unit for notifying the user of the timing to fixate on the light stimulation may be different from the display screen 121. For example, another display device may be installed next to the liquid crystal element 12, and the content notifying the timing to fixate on the light stimulation to the subject may be displayed on the display device.

[0134] In the claims, the specification, and the drawings, the execution order of each process such as the operations, procedures, steps, and stages in the devices, systems, programs, and methods shown is not explicitly stated as "earlier" or "preceding" etc. in particular. Also, it should be noted that the execution order of each process can be realized in an arbitrary order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the specification, and the drawings, even if "first," "next," etc. are used for convenience in the description, it does not mean that it is essential to implement in this order.

Explanation of Reference Numerals

[0135] 1 ··· Setting system, 10 ··· Light stimulation generation unit, 11 ··· Light source unit, 12 ··· Liquid crystal element, 20 ··· Camera, 30 ··· Information processing device, 51 ··· Processing unit

Claims

1. An eyeglass lens setting system comprising: a light stimulation generation unit that generates light stimulations of a plurality of colors for inducing the pupillary light reflex; a camera that images changes in the pupil of the user due to the pupillary light reflex induced by each of the light stimulations of the respective colors; a processing unit that creates the visual sensitivity characteristics of the user from the image captured by the camera and outputs data indicating the transmittance of each of the colored lights in the eyeglass lens using the created visual sensitivity characteristics; A setting system comprising the above.

2. The light stimulation generation unit comprises: a light source unit that selectively irradiates any one of the plurality of monochromatic lights; an optical filter that generates the light stimulation by changing one or more parameters among the luminance, chromaticity spatial frequency, and chromaticity temporal frequency of the monochromatic light irradiated from the light source unit; The setting system according to Claim 1, comprising the above.

3. The light source unit comprises a plurality of monochromatic light sources that emit monochromatic lights having different wavelengths from each other, and the plurality of monochromatic light sources comprise: a first monochromatic light source in which a wavelength band is distributed centered on a first wavelength; a second monochromatic light source in which the wavelength band is distributed centered on a second wavelength different from the first wavelength, wherein the first wavelength and the second wavelength are included in the visible light region between 380 nm and 780 nm. The setting system according to Claim 2.

4. The optical filter is installed between the light source unit and the user. The setting system according to Claim 2.

5. The optical filter is a liquid crystal element. The setting system according to Claim 4.

6. Comprising a display unit that notifies the user of the timing to fixate on the light stimulation. The setting system according to Claim 2.

7. The display unit is installed between the light source unit and the user. The setting system according to Claim 6.

8. The camera acquires an image of the pupil of at least one of the left and right eyes of the user. The setting system according to Claim 1.

9. The light source unit is arranged behind the liquid crystal element and has a function as a backlight of the liquid crystal element and a function as a light source for generating the light stimulation. The display screen on the front surface of the liquid crystal element has a predetermined region for displaying the light stimulation. The setting system according to Claim 7.

10. Comprising a control unit that controls the operation of the light stimulation generation unit. The control unit causes information for notifying a user of the timing to fixate on the light stimulus to be displayed on the display screen, and causes the light stimulus to be emitted on the display screen at the timing. The setting system according to claim 9.

11. The processing unit includes a measurement unit that measures feature amounts of the light reflection for each color from an image of the light reflection of the user, and a data creation unit that creates the visual sensitivity characteristics of the user for each color using the feature amounts of each color measured by the measurement unit. The setting system according to claim 1.

12. The feature amount is numerical data related to the pupil, and is one or more of a maximum pupil diameter, a minimum pupil diameter, a speed of change from the maximum pupil diameter to the minimum pupil diameter, a time required for the change in the speed, a re-expansion speed, and a contraction rate of the pupil. The setting system according to claim 11.

13. A method for designing spectacle lenses, comprising: generating light stimuli of a plurality of colors that induce a light reflection of the pupil; imaging, with a camera, a change in the pupil due to the light reflection induced by the light stimuli of each color; creating the visual sensitivity characteristics of the user from an image captured by the camera; and outputting data indicating a transmittance of each color light in the spectacle lens using the created visual sensitivity characteristics. The setting method including the above.

Images