Ophthalmic targets, ophthalmic devices, and programs

Abstract

This ophthalmic examination visual target comprises a plurality of visual targets as constituent elements. The visual targets each have, as constituent elements, a contour portion having a predetermined line width for distinguishing a background portion from a visual target body in the visual target, and a visual target internal portion having a predetermined area enclosed by the contour portion. The visibility of the visual targets is varied by varying the color difference between the contour portion, and the background portion and the visual target internal portion in each visual target.

Description

Technical Field

[0001] The present invention relates to an ophthalmic target, an ophthalmic apparatus, and a program. This application claims priority based on Japanese Patent Application No. 2023-095678 filed on June 9, 2023, the content of which is incorporated herein by reference.

Background Art

[0002] Visual targets are used to measure the cognitive function of vision. For example, Patent Document 1 describes a Snellen letter target and the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] The ophthalmic target according to the first aspect of the present invention has a plurality of visual targets as constituent elements, and each of the visual targets has, as constituent elements, a contour portion having a predetermined line width that divides a background portion and a target body within the visual target, and a target interior having a predetermined area closed by the contour portion. The visibility is made different by making the color difference between the background portion and the target interior within the visual target and the contour portion different.

[0005] The ophthalmic apparatus according to the second aspect of the present invention includes a first acquisition unit that acquires an instruction to start an examination using the above-described ophthalmic target, and a first presentation unit that presents the ophthalmic target to a subject according to the instruction acquired by the first acquisition unit.

[0006] The program according to the third aspect of the present invention causes a computer to execute a first acquisition step of acquiring an instruction to start an examination using the above-described ophthalmic target, and a first presentation step of presenting the ophthalmic target to a subject according to the instruction acquired by the first acquisition step. [Brief explanation of the drawing]

[0007] [Figure 1] This is a conceptual diagram illustrating an example of an examination method using the ophthalmic target according to this embodiment. [Figure 2] This figure illustrates an example of the components of the visual target according to this embodiment. [Figure 3] This figure illustrates an example of the components of the optometric target according to this embodiment. [Figure 4] This figure illustrates a first modified example of the ophthalmic target according to this embodiment. [Figure 5] This figure illustrates a second modified example of the ophthalmic target according to this embodiment. [Figure 6] This is a block diagram of the system according to this embodiment. [Figure 7] This is a functional configuration diagram illustrating an example of the functional configuration of the terminal device according to this embodiment. [Figure 8] This is a sequence diagram illustrating an example of the processing flow of the system according to this embodiment. [Figure 9] This is a functional configuration diagram illustrating the functional configuration of a first modified example of the terminal device according to this embodiment. [Figure 10] This is a sequence diagram illustrating an example of the processing flow of the first modified system according to this embodiment. [Figure 11] This is a functional configuration diagram illustrating an example of the functional configuration of a second modified example of the terminal device according to this embodiment. [Figure 12] This is a sequence diagram illustrating an example of the processing flow of a second modified system according to this embodiment. [Modes for carrying out the invention]

[0008] [Embodiment] The optometric target, optometric apparatus, and program according to this embodiment will be described in detail below with reference to the attached drawings, with reference to preferred embodiments. Note that this embodiment is not limited to these embodiments, and includes various modifications and improvements. In other words, the components described below include those that are easily conceivable to those skilled in the art, and those that are substantially the same, and the components described below can be combined as appropriate. Furthermore, this embodiment allows for various omissions, substitutions, or modifications of components without departing from the spirit of the present invention.

[0009] [overview] Vision quality is evaluated by factors such as visual acuity and contrast sensitivity. Contrast targets include general visual acuity test targets such as Landolt rings and Cinelen letters, as well as contrast sensitivity test targets using Gabor stimuli.

[0010] Visual test targets sometimes do not emphasize whether the outlines of the shapes can be clearly seen. For example, the Landolt ring target and the Cinelen letter target are general visual acuity test targets with clear outlines. However, in tests using the Landolt ring target, even if the eyes are out of focus and the image appears blurry, if the direction of the gap in the Landolt ring can be determined from the shades of black and white, it may be judged as readable. In tests using the Cinelen letter target, even if the eyes are out of focus and the image appears blurry, if the shape of the letters can be determined from the shades of black and white, it may be judged as readable. Furthermore, contrast sensitivity test targets using Gabor stimuli do not have clear outlines to begin with.

[0011] Furthermore, Landolt ring targets are generally represented by a letter like the letter C, with the inside of the letter filled in. Therefore, even if it is difficult for the test subject to clearly see the outline of the test target, they can infer the overall image of the test target from the contrast between the test target and the background. Even if the test subject can clearly see the outline of the test target by wearing glasses or contact lenses (hereinafter, when simply referred to as glasses, this may include devices that correct vision such as contact lenses), they were able to infer the overall image of the test target even before wearing glasses, so there was a problem in that it was difficult for them to feel the effect of improved visual cognitive function due to wearing glasses. Therefore, this embodiment provides a target that makes it easier to feel the effect of improved visual cognitive function due to wearing glasses.

[0012] Figure 1 is a conceptual diagram illustrating an example of an examination using an optometric target according to this embodiment. The examination using the optometric target 10 will be described with reference to Figure 1. The examination using the optometric target 10 is performed, for example, in an optician's shop. In the following description, the person being examined will be referred to as subject 1, and the person performing the examination will be referred to as examiner. Subject 1 has their visual cognitive function measured by undergoing an examination using the optometric target 10. More specifically, the examination is conducted to assess the improvement in cognitive function before and after subject 1 wears eyeglasses 2. The solid arrows in Figure 1 schematically show the line of sight of subject 1 when looking at the optometric target 10 at a predetermined distance. The examiner has subject 1 view the optometric target 10, which is presented at a predetermined distance from subject 1. The examination may be performed one eye at a time, with one eye closed (or one eye covered with an occluder not shown) and the other eye open. The examination may also be performed simultaneously on both eyes with both eyes open. Subject 1 visually perceives the content represented on the ophthalmic target 10 and responds verbally or via a tablet device to indicate what they were able to recognize. In the examination using the ophthalmic target 10, visual cognitive function is measured based on the responses of Subject 1.

[0013] Incidentally, the predetermined distance between the subject 1 and the retinoscopy target 10 may be appropriately set according to the examination situation using the retinoscopy target 10, the size of the retinoscopy target 10, and the like. The retinoscopy target 10 may be presented to the subject 1 by a display such as a tablet terminal device or a personal computer, a screen such as a projector or a projector, a printed matter such as paper, or the like. The retinoscopy target 10 may be presented to the subject 1 by a method other than using a display, a screen, or a printed matter such as paper.

[0014] FIG. 1(A) is a diagram for explaining an examination mode using the retinoscopy target 10 before wearing the glasses 2. In FIG. 1(A), it is preferable for the subject to undergo the examination in a naked-eye state. However, if the subject 1 usually wears vision correction glasses, contact lenses, or the like, these may be worn. Further, even if the subject 1 has experience of undergoing vision restoration surgery such as LASIK (laser in situ keratomileusis) or ICL (Implantable Contact Lens), the examination according to the present embodiment can be performed.

[0015] FIG. 1(B) is a diagram for explaining an examination mode using the retinoscopy target 10 in a state where the subject 1 is wearing the glasses 2. In FIG. 1(B), the subject 1 undergoes the examination while wearing the glasses 2. The examination using the retinoscopy target 10 may be performed by comparing the result in a state where the subject 1 is not wearing the glasses 2 as shown in FIG. 1(A) with the result in a state where the subject 1 is wearing the glasses 2 as shown in FIG. 1(B). When performing the examination using the retinoscopy target 10 in a state where the glasses 2 are not worn and a state where the glasses 2 are worn, the subject 1 can experience an improvement in the visual recognition function due to wearing the glasses 2.

[0016] [Visual target] FIG. 2 is a diagram for explaining an example of the components of the optotype according to the present embodiment. While referring to FIG. 2, an example of the components of the optotype 11 included in the ophthalmic optotype 10 according to the present embodiment will be described. The ophthalmic optotype 10 includes a plurality of optotypes 11 with different visibility. Each optotype 11 has a background portion 12 and an optotype main body 13 as components.

[0017] The optotype main body 13 includes a contour portion 14 and an optotype interior 15 as components. When the subject 1 visually recognizes the optotype main body 13, it has a shape such as characters that can recognize the content or name of the optotype main body 13. The shape of the optotype main body 13 is not limited to characters, and may be a two-dimensional figure, a symbol, or a combination thereof. The optotype main body 13 may be, for example, an illustration of a cat. The size of the optotype main body 13 may be appropriately set to a size suitable for the examination according to the situation of the examination using the ophthalmic optotype 10. For example, as an example of the character size when the optotype main body 13 is a character, when the distance between the subject 1 and the ophthalmic optotype 10 is from 10 cm to 40 cm, it may be about 72 points.

[0018] The background portion 12 is the range other than the optotype main body 13 within the optotype 11. The background portion 12 may have any color as a component as long as the cognitive function of the subject 1 can be appropriately measured as the ophthalmic optotype 10. Specifically, when the optotype main body 13 is black, the background portion 12 is preferably white in order to make the optotype main body 13 prominent.

[0019] The contour portion 14 is a line with a predetermined line width that separates the background portion 12 from the visual sample body 13. The predetermined line width is any line width that allows the examination using the optometric target 10 to be performed appropriately, and may be set as appropriate depending on the nature of the examination. The visibility of the visual sample body 13 can be controlled by adjusting the color of the contour portion 14 while fixing the line width of the contour portion 14, or by adjusting the colors of the background portion 12 and the inside of the visual target 15. Specifically, the visibility of the visual sample body 13 can be improved by making the color of the contour portion 14 significantly different from the background portion 12 and the inside of the visual target 15. The visibility of the visual sample body 13 can be reduced by making the color of the contour portion 14 similar to the color of the background portion 12 and the inside of the visual target 15. The contour portion 14 can be any color as long as it can appropriately measure the cognitive function of the subject 1 as an optometric target 10.

[0020] The inside of the target 15 is a region with a predetermined area enclosed by the outline portion 14. The predetermined area is greater than 0. The color of the inside of the target 15 can be any color as a component, as long as it can appropriately measure the cognitive function of the subject 1 as an optometric target 10. For example, it is preferable that it be composed of the same color as the background portion 12.

[0021] In an examination using the optometric target 10, the colors of the background 12, the contour 14, and the inside of the target 15 are set so that it is difficult to infer the overall image of the visual target 13 from the color difference between the visual target 13 and the background 12. The color difference is defined between two colors; for example, the larger the color difference, the easier it is to distinguish between the two colors, and the smaller the color difference, the more difficult it is to distinguish between the two colors. Among the color differences, the contrast is defined as the difference between the brightness of the background 12 and the brightness of the contour 14 divided by the brightness of the background 12, and is expressed as a "%". Note that the color difference may also be, for example, the Euclidean distance between two colors in a certain color space. A certain color space may be, for example, composed of a combination of RGB (Red, Green, Blue).

[0022] For example, with a Landolt ring target, since the inside of the target is filled in, it is sometimes possible to infer the overall image of the target from the color difference between the target object and the target background even if the eye cannot focus. With the optometric target 10, the inside 15 of the target object 13 and the background 12 are the same color, so it is difficult for the subject 1 to infer the overall image of the target object 13 unless they focus their eyes and recognize the outline 14 of the target object 13. In an examination using the optometric target 10, in order to prevent individual differences in the subject 1's color vision from affecting the difficulty of recognizing the outline 14, it is preferable to make the outline 14 grayscale and the background 12 and the inside 15 of the target white. Furthermore, in order to reduce the visibility of the target 11, the colors of the outline portion 14, the background portion 12, and the interior portion 15 of the target may be of the same color family.

[0023] Furthermore, at the boundary between the contour portion 14 and the background portion 12, if the change in pixel value from the contour portion 14 to the background portion 12 is small, the boundary may become blurred. If the boundary is blurred, even if the subject 1 improves their visual cognitive function by wearing glasses 2 or other means, they will still not be able to clearly recognize the contour portion 14, making it difficult for them to perceive an improvement in their visual cognitive function. Therefore, in order to clarify the boundary between the contour portion 14 and the background portion 12, it is preferable that the pixel value of the contour portion 14 and the pixel value of the background portion 12 differ by a predetermined value or more. Here, the predetermined value is any value that allows for the appropriate measurement of the cognitive function of the subject 1 as an optometric target 10. Furthermore, the pixel value of the contour portion 14 of the visual sample body 13 and the pixel value of the inside of the target 15 may differ by a predetermined value or more.

[0024] Furthermore, when the distance between subject 1 and target 11 is in the range of 10 cm to 40 cm, if the line width of the contour portion 14 is less than 0.25 points, the visibility of target 11 may be too low, making it unsuitable as an optometric target 10 for measuring the cognitive function of multiple people under the same conditions. Also, when the line width of the contour portion 14 is 1.5 points or more, even if subject 1 cannot clearly see the contour portion 14, it may be possible to infer the overall shape of the visual specimen body 13 from the general shape of the contour portion 14. Therefore, the predetermined line width is preferably 0.25 points or more and less than 1.5 points when the distance between subject 1 and target 11 is in the range of 10 cm to 40 cm.

[0025] [Ophthalmological target] Figure 3 is a diagram illustrating an example of the components of the optometric target according to this embodiment. An example of the components of the optometric target 10 will be described with reference to Figure 3. The optometric target 10 has as its components targets 11a to 11c and color difference information 16a to 16c. In the following description, if the multiple targets, targets 11a to 11c, are not distinguished from each other, they may simply be referred to as target 11. Similarly, the components of target 11 will also be described in the same way. Also, if the multiple color difference information, color difference information 16a to 16c, are not distinguished from each other, they may simply be referred to as color difference information 16. The colors of the outline portion 14 of the multiple targets 11 are adjusted so that they have different visibility. In an examination using the optometric target 10, the subject's visual cognitive function is examined according to the type of target 11 that the subject 1 was able to see among the multiple targets 11. The number of optoelectronic targets 11 included in the optometric target 10 may be changed as appropriate depending on the type of examination. In the illustrated example, the optometric target 10 includes three optoelectronic targets 11a to 11c.

[0026] The color difference information 16 is displayed at a position corresponding to the target 11 and indicates the visibility of the corresponding target 11. The color difference information 16 may be a value corresponding to the target color difference, which is the color difference between the color of the outline portion 14 of the target 11 and the color of the background portion 12. Alternatively, the color difference information 16 may be a number assigned to the target 11 for convenience. The position where the color difference information 16 is displayed may be, for example, the lower right position of the target 11, as shown in the figure. Note that the color difference information 16 is intended to improve the convenience of the test and is therefore not necessarily required to be displayed.

[0027] The target 11a specifically consists of a white background portion 12a and a target object 13a of the character string "ai" in a predetermined size. The target object 13a is grayscale and consists of a contour portion 14a with a predetermined line width and a white target interior 15a. The color difference information 16a is displayed as the number "1" in the lower right position of the target 11. In the illustrated example, the color difference information 16 is a sequential number assigned for convenience.

[0028] Targets 11b and 11c are similar to target 11a in that they consist of a white background area (12b, 12c) and a visual sample body (13b, 13c) with a character size similar to that of target 11a. Furthermore, visual sample bodies 13b and 13c are similar to visual sample body 13a in that they are grayscale and consist of an outline area (14b, 14c) with a line width similar to that of target 11a and a white interior of the target (15b, 15c). In addition, color difference information 16b and 16c are similar to color difference information 16a in that they are displayed in the lower right corner of the target as a position corresponding to the target (11b, 11c).

[0029] On the other hand, visual sample 13b differs from visual sample 13a in that it is the string of characters "inu" (dog). Similarly, visual sample 13c differs from visual sample 13a in that it is the string of characters "yasai" (vegetable). To prevent subject 1 from inferring other visual targets 11 from the visual target 11 that they recognized, each of visual samples 13a to 13c may use unrelated strings of characters, symbols, or symbols. In the illustrated example, "ai" (love), "inu" (dog), and "yasai" (vegetable) are unrelated strings of characters. However, the multiple visual targets 11 may be strings of characters that, when read consecutively, form a sentence.

[0030] Contour portions 14a, 14b, and 14c have different colors as constituent elements. In the optometric target 10, the contrast of the targets 11 decreases as you progress from target 11a to target 11c, resulting in lower visibility. In the illustrated example, the contrast of the targets 11 in the optometric target 10 is 100% for target 11a, 60% for target 11b, and 20% for target 11c. In the examination using the optometric target 10, multiple targets 11 with different visibility are presented to the subject 1, and the subject 1's visual cognitive function is measured based on which targets 11 the subject 1 was able to recognize.

[0031] In the illustrated example, the color difference information 16a to 16c are assigned sequential numbers. Color difference information 16 may be used as an identification number when indicating the visual target 11 to be viewed by the subject 1.

[0032] In this embodiment, the optometric target 10 is shown in which the background portion 12 of multiple targets 11 is the same color, and the contour portions 14 of multiple targets 11 are different colors from each other. However, this embodiment is not limited to this example, and for example, the background portion 12 may be different for each target 11.

[0033] In this embodiment, the optometric target 10 is shown to have multiple targets 11 with the same character size for each target 13. However, this embodiment is not limited to this example, and the character size of the target 13 may differ for each target 11.

[0034] In this embodiment, the optometric target 10 is shown as having a contrast of 40% for each target 11, with target 11a having a contrast of 100%, target 11b having a contrast of 60%, and target 11c having a contrast of 20%. However, this embodiment is not limited to this example, and depending on the nature of the examination, the contrast difference between each target 11 in the optometric target 10 may be 0.8%. Specifically, the optometric target 10 may have a contrast of 12.5% ​​for target 11a, 11.7% for target 11b, and 10.9% for target 11c. By making the contrast difference finer, the subject 1 will be able to see different targets 11 before and after wearing the glasses 2, making it easier for them to perceive an improvement in their visual cognitive function after wearing the glasses 2.

[0035] [First variation of the optometric target] Figure 4 is a diagram illustrating a first modified example of the ophthalmic target according to this embodiment. Referring to Figure 4, the ophthalmic target 10A, which is the first modified example of the ophthalmic target 10, will be described. The ophthalmic target 10A differs from the ophthalmic target 10 in that it includes the same target 11 with the same color difference in the first direction of the ophthalmic target. In the examination, if the visual sample 13 is a simple letter, figure, or symbol, the subject 1 may guess correctly by chance. Therefore, in the ophthalmic target 10A, multiple targets 11 are prepared for the same color difference, and the examination is conducted using multiple targets 11. Based on the results of the examination using multiple targets 11, a judgment may be made regarding the visibility of the color difference based on the percentage of correct answers. For example, if there are five targets 11 for the same color difference, the examination can be conducted in such a way that the subject 1 is shown the next color difference (target 11 in the second direction DR2) when the accuracy rate is 80% (i.e., four targets are correct). In the following description of the first modified form of the optometric target, explanations of matters already described in optometric target 10 may be omitted. Optometric target 10A has targets 11a to 11d and color difference information 16a to 16c. The visual sample bodies 13 of target 11 included in optometric target 10A are the strings "ai," "inu," "yasai," and "saru," respectively. "Ai" and "inu" are examples of targets 11 having the same color difference, and in the illustrated example, two targets 11 are prepared for the same color difference. Note that "yasai" and "saru" each have different color differences, and one target 11 is prepared for each color difference.

[0036] The following describes in detail the first modified form of the optometric target. Optometric target 10A is similar to optometric target 10 in that the target 11 has a white background portion 12 and a visual sample body 13 of strings of similar font size as its constituent elements. Optometric target 10A is also similar to optometric target 10 in that the visual sample body 13 has a grayscale outline portion 14 with similar line widths and a white interior portion 15 of the target as its constituent elements.

[0037] The optometric target 10A differs from the optometric target 10 in that at least one target 11 with the same contour portion 14 color is placed in the first direction DR1, and targets 11 with different contour portion 14 colors are placed in the positive direction of the second direction DR2, which intersects with the first direction DR1, such that the value of the target color difference decreases in order. In the illustrated example, the contrast of the targets 11 included in the optometric target 10A is 100% for target 11a, 100% for target 11b, 60% for target 11c, and 20% for target 11d.

[0038] The optometric target 10A differs from the optometric target 10 in that a single color difference information 16a is displayed for both targets 11a and 11b, which are positioned in the first direction DR1. Since multiple targets 11 positioned in the first direction DR1 have the same target color difference, a single color difference information 16 may be displayed for them together. However, it is not necessarily required to display a single color difference information 16 for multiple targets 11 with the same target color difference value; the color difference information 16 may be displayed for each target 11.

[0039] In this embodiment, the optometric target 10A is shown as an example in which the target 11 has contour portions 14 of different colors such that the value of the target color difference decreases sequentially as the second direction DR2 moves in the positive direction. However, this embodiment is not limited to this example, and the target 11 may be arranged so that the value of the target color difference decreases sequentially as the second direction DR2 moves in the negative direction.

[0040] [Second variation of the optometric target] Figure 5 is a diagram illustrating a second modified example of the ophthalmic target according to this embodiment. Referring to Figure 5, the ophthalmic target 10B, a second modified example of the ophthalmic target 10, will be described. The ophthalmic target 10B differs from the ophthalmic target 10 in that it displays the target 11 included in the ophthalmic target to the subject 1 in multiple stages. In the following description of the second modified example of the ophthalmic target, explanations of matters already described for the ophthalmic target 10 and ophthalmic target 10A may be omitted. The ophthalmic target 10B includes target 11a to 11d and color difference information 16a to 16d. The visual sample bodies 13 of target 11 included in the ophthalmic target 10B are the strings "ai," "inu," "yasai," and "saru," respectively.

[0041] The optometric target 10B is similar to the optometric target 10 in that the target 11 consists of a white background portion 12 and a visual sample body 13 of strings of similar font size. Furthermore, the optometric target 10B is similar to the optometric target 10 in that the visual sample body 13 consists of a grayscale outline portion 14 with similar line widths and a white interior portion 15 of the target. In addition, the optometric target 10B is similar to the optometric target 10 in that the color difference information 16 is displayed in the lower right position of the target 11, corresponding to the position of the target 11.

[0042] In optometrist target 10B, Figure 5(A) shows the target 11 displayed to subject 1 on the first attempt, Figure 5(B) on the second attempt, Figure 5(C) on the third attempt, and Figure 5(D) on the fourth attempt. Due to limitations in the display size of tablet devices and personal computers, it is not possible to display many targets 11 simultaneously. Therefore, optometrist target 10B switches the display sequentially from Figure 5(A) to Figure 5(D). Optophthalmtrist target 10B differs from optometrist target 10 in that it displays targets 11 with different colored outlines 14 such that the target color difference value decreases with each display. In the illustrated example, the contrast values ​​of the targets 11 included in optometrist target 10B are 100%, 70%, 40%, and 10%, respectively. In the examination using the optometric target 10B, the subject 1 is presented with multiple targets 11 that have different visibility characteristics, and the subject 1's visual cognitive function is measured based on which targets 11 the subject 1 is able to recognize. The optometric target 10B may also be displayed to the subject 1 sequentially using multiple printed materials, such as a picture story show.

[0043] In this embodiment, the optometric target 10B is shown in which targets 11 with different colored outlines 14 are displayed to the subject 1 such that the color difference value of the target decreases each time it is displayed. However, this embodiment is not limited to this example, and if the subject 1 is unable to recognize the displayed target 11, the subject 1 may be shown a target 11 that has a larger color difference than the unrecognized target 11 and a smaller color difference than the targets 11 that the subject 1 has recognized so far.

[0044] In this embodiment, an example is shown in which the optometric target 10B displays one target 11 to the subject 1 at a time. However, this embodiment is not limited to this example, and multiple targets 11 may be displayed to the subject 1 at a time. If the visual sample body 13 is a simple character, figure, or symbol, such as a Cinelen character target, the subject 1 may hit it by chance even if they cannot recognize the outline portion 14. Therefore, in an examination using the optometric target 10B, for example, if the subject 1 recognizes a predetermined percentage of the multiple targets 11 displayed at a time, the next target 11 may be displayed.

[0045] [Ophthalmic device] Next, an example of an eye examination device according to this embodiment will be described with reference to Figures 6 to 8.

[0046] Figure 6 is a block diagram of the system according to this embodiment. An example of system 3 will be described with reference to Figure 6. System 3 comprises a plurality of terminal devices 20 and a server device 21. Terminal devices 20-1 and terminal devices 20-2 included in system 3 exemplify a plurality of terminal devices 20. The plurality of terminal devices 20 and at least one server device 21 are connected to each other via a network NW. The network NW is a predetermined communication network configured using circuits. An example of a network NW is the internet. A predetermined communication network NW is an open network, and devices connected to the communication network NW can communicate with each other using predetermined protocols. In the internet layer of the communication network NW, communication is performed using the Internet Protocol (IP), etc.

[0047] The terminal device 20 is operated by the examiner or the subject 1. The terminal device 20 receives an instruction to start the examination using the optometric target 10 based on the operation of the examiner or the subject 1. The terminal device 20 transmits control information CI to the server device 21 via the network NW. The control information CI broadly includes information for the control unit 32 to control the server device 21. For example, the control information CI includes information that controls the server device 21 to transmit information about the optometric target 10 used in the examination to the control unit 32. The terminal device 20 operates as an optometric device by executing a predetermined program during the examination using the optometric target 10. The terminal device 20 may be, for example, a personal computer, a tablet computer, or a smartphone.

[0048] The server device 21 may have information regarding the optometric target 10 pre-stored. The server device 21 acquires control information CI from each of the multiple terminal devices 20. The server device 21 transmits target information OI to the terminal device 20 that transmitted the control information CI. The target information OI includes information regarding the optometric target 10. The target information OI includes, for example, information regarding the optometric target 10 specified by the examiner or subject 1. The server device 21 is implemented, for example, using a computer and software. The server device 21 may also be implemented using electronic circuits as needed. Furthermore, the server device 21 may be an independent device, and at least a part of the configuration of the server device 21 may be implemented as an independent device. In addition, at least a part of the functions implemented by the server device 21 may be implemented by cloud computing.

[0049] The terminal device 20 acquires the target information OI transmitted from the server device 21 in accordance with the control information CI. The terminal device 20 displays the acquired target information OI to the subject 1. The subject 1 visually inspects the contents of the eye examination target 10 displayed on the terminal device 20 and responds whether or not they were able to recognize it. The response regarding whether or not they were able to recognize it is given verbally or by operating the terminal device 20. In the examination, the subject 1's visual cognitive function is measured based on their response. The results of the measurement of visual cognitive function may be communicated verbally or using printed materials such as paper by the examiner, or they may be displayed on the terminal device 20.

[0050] Figure 7 is a functional configuration diagram illustrating an example of the functional configuration of a terminal device according to this embodiment. An example of the terminal device 20 will be described with reference to Figure 7. The terminal device 20 comprises a first acquisition unit 31, a control unit 32, and a first presentation unit 33. Each of these functional units is implemented, for example, using a computer and software. Each functional unit may also be implemented using electronic circuits as needed. Furthermore, each functional unit does not have to be included in a single device, and the terminal device 20 may be configured from multiple devices. In addition, each functional unit may be internally equipped with storage means such as semiconductor memory or magnetic hard disk drives as needed. The terminal device 20 operates as an optometric device by executing a predetermined program during an examination using the optometric target 10.

[0051] The first acquisition unit 31 acquires instruction information II based on an operation by the examiner or the subject 1. Instruction information II includes information regarding an instruction to start the examination using the ophthalmic target 10. Instruction information II may also include information specifying the ophthalmic target 10 to be used for the examination. The first acquisition unit 31 transmits the acquired instruction information II to the control unit 32.

[0052] The control unit 32 acquires instruction information II from the first acquisition unit 31. Based on the acquired instruction information II, the control unit 32 transmits control information CI to the server device 21. That is, the control unit 32 controls the server device 21 to transmit the ophthalmic target 10 specified by the examiner or subject 1 to the control unit 32.

[0053] The server device 21 acquires control information CI from the control unit 32. The server device 21 then transmits target information OI to the control unit 32 that sent the control information CI, according to the acquired control information CI. Specifically, the server device 21 transmits to the control unit 32 information regarding the optometric target 10 specified by the examiner or the subject 1 from the information regarding the optometric target 10 that has been stored in advance.

[0054] The control unit 32 acquires target information OI from the server device 21. The control unit 32 transmits the acquired target information OI to the first presentation unit 33.

[0055] The first display unit 33 acquires target information OI from the control unit 32. The first display unit 33 displays the ophthalmic target 10 included in the acquired target information OI to the subject 1. The subject 1 measures their visual cognitive function using the displayed ophthalmic target 10.

[0056] In the example described above, the terminal device 20 exchanges information with the server device 21 each time it obtains instruction information II from the examiner or subject 1. However, this embodiment is not limited to this example. The terminal device 20 may further have a storage unit as a component, and the storage unit may have information regarding the ophthalmic target 10 stored in advance. Information regarding the ophthalmic target 10 may be obtained in advance from the server device 21. If the terminal device 20 has a storage unit as a component, the control unit 32 may obtain instruction information II from the examiner or subject 1 and exchange information with the storage unit based on the obtained instruction information II.

[0057] Specifically, the control unit 32 acquires information from the memory unit based on the acquired instruction information II. The control information CI includes information about the optometric target 10 used in the examination. The memory unit transmits the target information OI to the control unit 32 according to the acquired control information CI. The control unit 32 searches for and acquires information about the optometric target 10 used in the examination from the information stored in the memory unit.

[0058] In some cases, the information regarding the optometric target 10 pre-stored in the memory unit may not contain information about the optometric target 10 specified by the examiner or subject 1. If the specified optometric target 10 does not exist in the memory unit, the control unit 32 transmits control information CI to the server device 21. The server device 21 transmits target information OI, which includes the optometric target 10 specified by the examiner or subject 1, to the terminal device 20 that transmitted the control information CI. In other words, if the information regarding the specified optometric target 10 does not exist in the memory unit, the control unit 32 obtains the necessary information from the server device 21.

[0059] Figure 8 is a sequence diagram illustrating an example of the processing flow of the system according to this embodiment. The processing flow of system 3 will be explained with reference to Figure 8. In Figure 8, the examiner or subject 1 operates the terminal device 20 and requests an ophthalmic target from the server device 21 via the network NW (step S34). The server device 21 transmits the requested ophthalmic target to the terminal device 20 (step S35). The terminal device 20 displays the transmitted ophthalmic target 10 to the subject 1. As mentioned above, a storage unit (not shown) provided in the terminal device 20 may be used instead of the server device 21.

[0060] [First modified example of the ophthalmoscopic device] Next, with reference to Figures 9 and 10, an example of terminal device 20A, which is a first modification of terminal device 20 according to this embodiment, will be described. Terminal device 20A differs from terminal device 20 in that, in the ophthalmic target 10, it identifies the visual cognitive function of the subject 1 based on the target color difference of the target 11 that the subject 1 could see.

[0061] Figure 9 is a functional configuration diagram illustrating the functional configuration of a first modified example of the terminal device according to this embodiment. Referring to Figure 9, an example of terminal device 20A, which is a first modified example of terminal device 20, will be described. Terminal device 20A further comprises a second acquisition unit 41, a specific unit 42, and a second presentation unit 43, and differs from terminal device 20 in that it comprises a control unit 32A instead of a control unit 32. In the configuration of terminal device 20A, components similar to those of terminal device 20 may be denoted by the same reference numerals, and their explanation may be omitted.

[0062] The second acquisition unit 41 acquires visual information VI through an operation by the examiner or the subject 1. The visual information VI includes information about the visual targets 11 that the subject 1 was able to see during the examination. The visual information VI may also include information about the color difference of the visual targets 11 that the subject 1 was able to see in the ophthalmic target 10 displayed to the subject 1. The second acquisition unit 41 transmits the acquired visual information VI to the control unit 32A.

[0063] The control unit 32A differs from the control unit 32 in that it further includes a specification unit 42. The control unit 32A acquires visual information VI from the second acquisition unit 41. The specification unit 42 identifies visual information EI based on the visual information VI acquired from the second acquisition unit 41. Visual information EI includes information about the subject's visual cognitive function. That is, the specification unit 42 measures the subject's visual cognitive function based on the target color difference of the target 11 that the subject could see. The control unit 32A transmits the visual information EI identified by the specification unit 42 to the second presentation unit 43.

[0064] The second display unit 43 acquires visual information EI from the control unit 32A. The second display unit 43 presents the acquired visual information EI to the examiner or subject 1. The examiner or subject 1 may select eyeglasses 2 suitable for improving the subject 1's visual cognitive function based on the presented visual information EI.

[0065] In the illustrated example, the specific unit 42 is shown as a component of the control unit 32A. However, this embodiment is not limited to this example, and the specific unit 42 may be a component of the server device 21. When the specific unit 42 is a component of the server device 21, the control unit 32A exchanges information with the server device 21.

[0066] Specifically, the control unit 32A transmits visual information VI in addition to control information CI to the server device 21. The server device 21 acquires the control information CI and the visual information VI. The server device 21 identifies visual information EI based on the visual information VI, according to the acquired control information CI. The server device 21 transmits the identified visual information EI to the control unit 32A, which has transmitted the control information CI and the visual information VI. The control unit 32A transmits the visual information EI obtained from the server device 21 to the second display unit 43.

[0067] Figure 10 is a sequence diagram illustrating an example of the processing flow of a first modified example of the terminal device according to this embodiment. The processing flow of system 3 of terminal device 20A will be explained with reference to Figure 10. The processing flow of system 3 of terminal device 20A is the processing flow of system 3 when the server device 21 has a specific unit 42 as a component. The processing illustrated in Figure 10 includes, in addition to the processing illustrated in Figure 8, the answer to the visually visible target 11 (step S44) and the presentation of visual information EI (step S45). In the explanation given with reference to Figure 10, processing similar to that in Figure 8 may be omitted from explanation by using the same reference numerals.

[0068] After the processing in step S35 is completed, the examiner or subject 1 operates the terminal device 20 to provide the server device 21 with the answers regarding the visual targets 11 that subject 1 was able to see (step S44). Based on the visual targets that subject 1 was able to see, the server device 21 identifies visual information EI, which includes information about subject 1's visual cognitive function. The server device 21 transmits the visual information EI to the terminal device 20 (step S45). Based on the transmitted visual information EI, the terminal device 20 displays information about subject 1's visual cognitive function to the examiner or subject 1.

[0069] [Second variation of the ophthalmoscopic device] Next, with reference to Figures 11 and 12, an example of terminal device 20B, which is a second modification of terminal device 20 according to this embodiment, will be described. Terminal device 20B differs from terminal device 20 in that, in the ophthalmic target 10, it searches for eyeglasses 2 that improve the visual cognitive function of the subject 1 based on the target color difference of the target 11 that the subject 1 could see.

[0070] Figure 11 is a functional configuration diagram illustrating the functional configuration of a second modified example of the terminal device according to this embodiment. Referring to Figure 11, an example of terminal device 20B, which is a second modified example of terminal device 20, will be described. Terminal device 20B differs from terminal device 20 in that it further includes a search unit 51 and a third presentation unit 52, and includes a control unit 32B instead of a control unit 32. In the configuration of terminal device 20B, components that are the same as those in terminal device 20 may be denoted by the same reference numerals, and their explanation may be omitted.

[0071] The control unit 32B differs from the control unit 32 in that it further includes a search unit 51. The control unit 32B acquires visual information VI from the second acquisition unit 41. Based on the visual information VI acquired from the second acquisition unit 41, the search unit 51 searches for information about eyeglasses 2 or lenses that will improve the visual cognitive function of the subject 1. The information about eyeglasses 2 or lenses that will improve the visual cognitive function of the subject 1 is referred to as eyeglass information GI. That is, the search unit 51 searches for eyeglasses 2 that are suitable for improving the visual cognitive function of the subject 1, based on the visual target 11 that the subject 1 was able to see. The control unit 32B transmits the eyeglass information GI regarding the eyeglasses 2 found by the search unit 51 to the third presentation unit 52. The search performed by the search unit 51 may be, for example, by machine learning methods or by rule-based methods.

[0072] The third display unit 52 acquires eyeglass information GI from the control unit 32B. The third display unit 52 presents information about eyeglasses 2 identified by the acquired eyeglass information GI to the examiner or subject 1. The examiner or subject 1 may select eyeglasses that suit the subject 1's preferences based on the presented information.

[0073] In the illustrated example, the search unit 51 is shown as a component of the control unit 32B. However, this embodiment is not limited to this example, and the search unit 51 may also be a component of the server device 21. When the search unit 51 is a component of the server device 21, the control unit 32B exchanges information with the server device 21.

[0074] Specifically, the control unit 32B transmits the control information CI and the visibility information VI to the server device 21. The server device 21 acquires the control information CI and the visibility information VI. Based on the acquired control information CI and the visibility information VI, the server device 21 searches for the eyeglasses information GI. The server device 21 transmits the searched eyeglasses information GI to the control unit 32B, which transmitted the control information CI and the visibility information VI. The control unit 32B transmits the eyeglasses information GI acquired from the server device 21 to the third display unit 52.

[0075] Figure 12 is a sequence diagram illustrating an example of the processing flow of a second modified system of the terminal device according to this embodiment. The processing flow of system 3 of terminal device 20B will be described with reference to Figure 12. The processing flow of system 3 of terminal device 20B is the processing flow of system 3 when the server device 21 has a search unit 51 as a component. The processing illustrated in Figure 12 includes, in addition to the processing illustrated in Figure 10, the transmission of glasses information (S53). In the explanation given with reference to Figure 12, processing similar to that in Figure 10 may be denoted by the same reference numerals and their explanation may be omitted.

[0076] The server device 21 searches for eyeglasses information GI, which includes information about eyeglasses that improve the visual cognitive function of the subject 1, based on the visual targets that the subject 1 was able to see. The server device 21 transmits the eyeglasses information GI to the terminal device 20 (step S53). The terminal device 20 displays the transmitted visual information EI and eyeglasses information GI to the examiner or the subject 1.

[0077] [Summary of this embodiment] According to the embodiment described above, the optometric target 10 has a plurality of targets 11 as its constituent elements, and each target 11 has a contour portion 14 with a predetermined line width that separates the background portion 12 and the target body 13 within the target 11, and an interior 15 of the target having a predetermined area enclosed by the contour portion 14 as its constituent elements, and the visibility is made different by making the color difference between the background portion 12 and the interior 15 of the target 11 and the contour portion 14 different. For example, with Landolt ring targets, the interior of the target is filled in, so it is sometimes possible to infer the overall image of the target from the color difference between the target body and the target background even if the eye is not in focus. According to this embodiment, in the optometric target 10, the interior 15 of the target body 13 and the background portion 12 are the same color, and it is difficult for the subject 1 to infer the overall image of the target body 13 unless they focus their eyes and recognize the contour portion 14 of the interior 15 of the target. The optometric target 10 according to this embodiment can be seen when the eye is in focus, thus providing a target that makes it easy for the subject 1 to feel the improvement in cognitive function caused by wearing the glasses 2.

[0078] Furthermore, according to the embodiment described above, in the optometric target 10, the background portion 12 of the multiple targets 11 is constant in color, while the contour portions 14 of the multiple targets 11 are different in color, thereby creating different visibility. In the examination using the optometric target 10, the subject 1 is presented with multiple targets 11 with different visibility, and the subject 1's visual cognitive function is measured based on which targets 11 the subject 1 was able to recognize. During the examination, the constant color of the background portion 12 of the multiple targets 11 included in the optometric target 10 reduces the influence of individual differences in color vision. The optometric target 10 according to this embodiment can measure the subject 1's visual cognitive function in the examination, regardless of individual differences in color vision.

[0079] Furthermore, according to the embodiment described above, in the optometric target 10, the color of the outline portion 14 of the multiple targets 11 is constant, while the colors of the background portion 12 of the multiple targets 11 are different from each other, thereby creating different visibility. In the examination using the optometric target 10, the subject 1 is presented with multiple targets 11 with different visibility, and the subject 1's visual cognitive function is measured based on which targets 11 the subject 1 was able to recognize. During the examination, the constant color of the outline portion 14 of the multiple targets 11 included in the optometric target 10 reduces the influence of individual differences in color vision. The optometric target 10 according to this embodiment can measure the subject 1's visual cognitive function in the examination, regardless of individual differences in color vision.

[0080] Furthermore, according to the embodiment described above, in the optometric target 10, the pixel values ​​of the contour portion 14 and the background portion 12 of the target 11 differ by a predetermined value or more. If the change in pixel values ​​from the contour portion 14 to the background portion 12 is small at the boundary between the contour portion 14 and the background portion 12, the boundary may become blurred. If the boundary is blurred, even if the subject 1 improves their visual cognitive function by wearing glasses 2 or other methods, they will still not be able to clearly recognize the contour portion 14, making it difficult to perceive an improvement in visual cognitive function. According to this embodiment, since the pixel values ​​of the contour portion 14 and the background portion 12 of the target 11 differ by a predetermined value or more, the boundary between the contour portion 14 and the background portion 12 is clear. If the boundary between the contour portion 14 and the background portion 12 is clear, the optometric target 10 can be seen when the eye is in focus. Therefore, the optometric target 10 according to this embodiment can be seen when the eye is in focus, thus providing a target that makes it easier for the subject 1 to feel the improvement in cognitive function caused by wearing the glasses 2.

[0081] Furthermore, according to the embodiment described above, in the optometric target 10, the multiple targets 11 are arranged such that the background portion 12 of the multiple targets is the same color, the contour portion 14 constituting the target 11 is the same color in the first direction DR1, and in the second direction DR2 which intersects with the first direction DR1, the contour portions 14 of the multiple targets 11 are arranged in different colors such that the visibility of the targets 11 decreases sequentially as the subject moves to the second direction DR2. In the examination, if the visual sample body 13 is a simple letter, figure, or symbol, the subject 1 may guess correctly by chance. According to this embodiment, in the examination, if a predetermined proportion of the multiple targets 11 arranged in the first direction DR1 are recognized, the optometric target 10A can be operated so that the subject 1 is shown targets 11 in the second direction DR2 rather than the targets 11 that were recognized. Therefore, the optometric target 10 according to this embodiment can measure the visual cognitive function of the subject 1 more accurately in the examination.

[0082] Furthermore, according to the embodiment described above, in the optometric target 10, the target 11 is grayscale. According to this embodiment, the test results are less likely to change due to individual differences in the subject's color vision. Therefore, the optometric target 10 according to this embodiment can measure the cognitive function of the subject's vision in the test, regardless of individual differences in color vision.

[0083] Furthermore, according to the embodiment described above, in the optometric target 10, the color of the outline portion 14 of the target 11 and the color of the background portion 12 are of the same color family. For example, with Landolt ring targets, the inside of the target is filled in, so even if the eyes are not in focus, it may be possible to infer the overall image of the target from the color difference between the target body and the target background. According to this embodiment, since the target body 13 and the background portion 12 are of the same color family, it is difficult to infer the overall image of the target body 13 from the color difference between the target body 13 and the background portion 12. Therefore, the subject 1 needs to focus their eyes to recognize the outline portion 14 inside the target 15. The optometric target 10 according to this embodiment can be seen when the eyes are in focus, so it can provide a target that makes it easy for the subject 1 to feel the improvement in cognitive function due to wearing glasses 2.

[0084] Furthermore, according to the embodiment described above, in the optometric target 10, the predetermined line width of the contour portion 14 is such that, when the distance at which the subject 1 visually views the target 11 is between 10 cm and 40 cm, the line width of the contour portion 14 is between 0.25 points and less than 1.5 points. This is because, when the distance at which the subject 1 visually views the target 11 is between 10 cm and 40 cm, if the line width of the contour portion 14 is 1.5 points or more, it becomes too thick, and even if the contour portion 14 cannot be clearly seen, it becomes possible to infer the overall image of the visual specimen body 13 from the color difference between the contour portion 14 and the background portion 12. Also, if the line width of the contour portion 14 is less than 0.25 points, the visibility of the target 11 becomes too low, making it unsuitable as an optometric target 10 for measuring the cognitive function of multiple people under the same conditions. The optometric target 10 according to this embodiment can be seen when the eye is in focus, thus providing a target that makes it easy for the subject 1 to feel the improvement in cognitive function caused by wearing the glasses 2.

[0085] Furthermore, according to the embodiment described above, in the optometric target 10, color difference information 16 is provided at a position corresponding to the target, which includes at least one of the following: a value corresponding to the target color difference, which is the color difference between the color of the outline portion 14 of the target 11 and the color of the background portion 12, or a number assigned to the target. According to this embodiment, the color difference information 16 can be used as an identification number when instructing the subject 1 to look at the target 11. In addition, the color difference information 16 can be used to allow the subject 1 to grasp the degree of their visual cognitive function by displaying the target color difference. Therefore, the optometric target 10 according to this embodiment can provide a highly convenient target in examinations.

[0086] Furthermore, according to the embodiment described above, the character size of the multiple targets 11 in the optometric target 10 is a predetermined size. According to this embodiment, the visibility of the targets 11 is not affected by the size of the targets 11, but is affected by the color difference between the background portion 12 and the inside of the targets 15 and the outline portion 14. Therefore, the optometric target 10 according to this embodiment can provide targets whose visibility is not affected by the size of the targets 11 during examination.

[0087] Furthermore, according to the embodiment described above, the optometry device includes a first acquisition unit 31 that acquires instruction information II, which includes information regarding an instruction to start a test using the optometry target 10 described above, and a first presentation unit 33 that presents the optometry target 10 to the subject 1 according to the instruction information II acquired by the first acquisition unit 31. According to this embodiment, the optometry device can display a specified optometry target 10 to the subject 1 from the optometry targets 10 stored in the server device 21. Therefore, the optometry device according to this embodiment can provide an optometry target 10 that makes it easy for the subject 1 to feel an improvement in their visual cognitive function.

[0088] Furthermore, according to the embodiment described above, the optometry device further includes a second acquisition unit 41 that acquires visual information VI, which is the color difference between the color of the outline portion 14 and the color of the background portion 12 of the visual target 11 that the subject 1 can see; an identification unit 42 that identifies visual information EI, which is information about the subject 1's visual cognitive function, based on the visual information VI acquired by the second acquisition unit 41; and a second presentation unit 43 that presents the identified visual information EI to the subject 1 or the examiner. Therefore, the optometry device according to this embodiment can measure the subject 1's visual cognitive function based on the visual target 11 that the subject 1 can see in the optometry target 10.

[0089] Furthermore, according to the embodiment described above, the eye examination device further includes a search unit 51 that searches for eyeglasses information GI, which is information about eyeglasses 2 that improve the visual cognitive function of the subject 1, based on the visual information VI acquired by the second acquisition unit 41, and a third presentation unit 52 that presents the searched eyeglasses information GI to the subject 1 or the examiner. Therefore, the eye examination device according to this embodiment can display to the subject 1 information about eyeglasses 2 that improve the visual cognitive function of the subject 1, based on the visual target 11 that the subject 1 has been able to see.

[0090] Furthermore, the entirety or part of the functions of each part of the optometric target 10, optometric target 10A, and optometric target 10B in the above-described embodiment may be realized by recording a program for realizing these functions on a computer-readable recording medium, having a computer system read the program recorded on this recording medium, and executing it. The term "computer system" here includes hardware such as an operating system and peripheral devices.

[0091] Furthermore, "computer-readable recording media" refers to portable media such as flexible disks, magneto-optical disks, ROMs, and CD-ROMs, as well as recording units such as hard disks built into computer systems. In addition, "computer-readable recording media" may include those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs over networks such as the Internet or communication lines such as telephone lines, and those that hold programs for a certain period of time, such as volatile memory inside computer systems that act as servers or clients in such cases. Moreover, the above-mentioned program may be for the purpose of realizing some of the functions described above, and may also be able to realize the above-mentioned functions in combination with programs already recorded in the computer system.

[0092] Although one embodiment of this invention has been described in detail above with reference to the drawings, the specific configuration is not limited to that described above, and various design changes can be made without departing from the spirit of this invention. Furthermore, the configurations described in each embodiment and example above may be combined. [Explanation of Symbols]

[0093] 1...Subject, 2...Eyeglasses, 10...Ophthalmic target, 11...Eye target, 12...Background area, 13...Visual specimen body, 14...Contour area, 15...Inside of eye target, 16...Color difference information, DR1...First direction, DR2...Second direction, 3...System, 20...Terminal device, 21...Server device, II...Indication information, NW...Network, OI...Eye target information, 31...First acquisition unit, 32...Control unit, 33...First presentation unit, CI...Control information, 41...Second acquisition unit, 42...Specification unit, 43...Second presentation unit, VI...Vision information, EI...Visual information, 51...Search unit, 52...Third presentation unit, GI...Eyeglasses information

Claims

1. An optometric target having multiple visual targets as constituent elements, The aforementioned target is A contour portion of a predetermined line width that separates the background portion within the target from the target body, and the interior of the target having a predetermined area enclosed by the contour portion, It has as a component, By varying the color difference between the background portion and the interior of the target and the outline portion, the visibility is altered. Eye examination target.

2. The background color of the aforementioned multiple visual targets is constant. The colors of the outlines of the aforementioned multiple visual targets differ from one another, thereby altering their visibility. The optometric target according to claim 1.

3. The color of the outline portion of the aforementioned multiple visual targets is constant. The background colors of the multiple visual targets mentioned above are different from each other, thereby altering their visibility. The optometric target according to claim 1.

4. The pixel values ​​of the contour portion of the target and the pixel values ​​of the background portion differ by a predetermined value or more. The optometric target according to claim 1.

5. The aforementioned multiple targets are The background color of the aforementioned multiple visual targets is constant. In the first direction, the contour portion constituting the visual target is arranged such that the color of the contour portion is constant. In a second direction intersecting the first direction, the outlines of the multiple visual targets are arranged in different colors such that the visibility of the visual targets decreases sequentially as one moves in the second direction. An ophthalmic target according to any one of claims 1 to 4.

6. The aforementioned target is grayscale. An ophthalmic target according to any one of claims 1 to 4.

7. The color of the outline portion of the target and the color of the background portion are of the same color family. An ophthalmic target according to any one of claims 1 to 4.

8. The predetermined line width in the contour portion is such that, when the distance at which the subject visually views the target is between 10 cm and 40 cm, the line width of the contour portion is 0.25 points or more and less than 1.5 points. An ophthalmic target according to any one of claims 1 to 4.

9. Color difference information, which includes at least one of the following: a value corresponding to the color difference between the color of the outline portion of the target and the color of the background portion of the target, or a number assigned to the target, is indicated at the position corresponding to the target. An ophthalmic target according to any one of claims 1 to 4.

10. The character size of the aforementioned multiple visual targets is a predetermined size. An ophthalmic target according to any one of claims 1 to 4.

11. A first acquisition unit that acquires an instruction to start an examination using the ophthalmic target described in any one of claims 1 to 4, A first presentation unit presents the ophthalmic target to the subject in accordance with the instructions acquired by the first acquisition unit, Equipped with Eye examination device.

12. A second acquisition unit acquires visual information, which is the color difference between the color of the outline portion and the color of the background portion of the visual target that the subject was able to see. Based on the visual information acquired by the second acquisition unit, an identification unit identifies visual information which is information about the subject's visual cognitive function, A second display unit presents the identified visual information to the subject or examiner, To further enhance The eye examination device according to claim 11.

13. A search unit searches for eyeglasses information, which is information about eyeglasses that improve the subject's visual cognitive function, based on the visual information acquired by the second acquisition unit. A third display unit that presents the searched eyeglass information to the subject or the examiner, Furthermore, it is equipped with The eye examination device according to claim 12.

14. On the computer, A first acquisition step of obtaining an instruction to start an examination using the ophthalmic target described in any one of claims 1 to 3, A first presentation step in which the ophthalmic target is presented to the subject in accordance with the instructions obtained in the first acquisition step, A program that executes the command.

15. A second acquisition step involves acquiring visual information, which is the color difference between the color of the outline portion of the visual target that the subject could see and the color of the background portion. Based on the visual information acquired in the second acquisition step, the identification step identifies visual information which is information about the subject's visual cognitive function, A second presentation step in which the identified visual information is presented to the subject or examiner, Further execution The program according to claim 14.

16. A search step is performed to search for eyeglasses information, which is information about eyeglasses that improve the subject's visual cognitive function, based on the visual information obtained in the second acquisition step. A third presentation step in which the searched eyeglass information is presented to the subject or the examiner, Further execution The program according to claim 15.

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