# US 2023/0053481 A1 · Visual target display device, visual target presentation method, and storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0053481 A1 - Document ID: US20230053481A1 - Status: Published application - Kind: A1 - Application number: 17/875,844 - Filed: 2022-07-28 - Published: 2023-02-23 - Earliest claimed: 2021-08-17 - Assignees: Chukyo Medical Co., Inc. - Applicants: Chukyo Medical Co., Inc. - Inventors: Kazuo ICHIKAWA; Sho YOKOYAMA; Yoshiki TANAKA - Web page: https://patentgrep.com/patent/US20230053481A1 ## CPC - H04N 9/3182: {Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607)} - A61B 3/066: {for testing colour vision} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract Provided is a visual target display device or a visual target presentation method which can test the cone-specific visual function more accurately in a device that displays a visual target, of a chromatic color, for testing the color-related visual function of a subject or a method of presenting the visual target. A visual target of a chromatic color and a background around the visual target are presented in such a way that the brightness of the background is a numerical value between a numerical value 10% less than the brightness of the visual target and a numerical value 10% greater than the brightness of the visual target and a combination of the color of the visual target and the color of the background is a combination of colors which are in a relationship of confusion colors in dichromatism. ## Claims ### Claim 1 A visual target display device comprising a display section configured to display a visual target, of a chromatic color, for testing a color-related visual function of a subject and a background around the visual target, wherein a brightness of the background is a numerical value between a numerical value 10% less than a brightness of the visual target and a numerical value 10% greater than the brightness of the visual target, a combination of a color of the visual target and a color of the background is a combination of colors which are in a relationship of confusion colors in dichromatism, and the display section changes a size of the visual target or displays a plurality of the visual targets of different sizes while maintaining the combination of the color of the visual target and the color of the background, so as to obtain a threshold value which is a size of the visual target based on which a determination on whether or not the subject is able to perceive the visual target is made. ### Claim 2 (depends on 1) The visual target display device according to claim 1, wherein the visual target is a visual target which is presented in a center of a visual field of the subject, the threshold value is a size of the visual target based on which a determination on whether or not the subject is able to perceive an orientation of the visual target is made when the visual target is presented in the center of the visual field of the subject, and the display section changes a size and an orientation of the visual target or displays a plurality of the visual targets of different sizes and orientations while maintaining the combination of the color of the visual target and the color of the background, so as to obtain the threshold value. ### Claim 3 (depends on 1) The visual target display device according to claim 1, wherein the display section displays the visual target while changing a display position randomly among a plurality of predetermined measurement points each at a peripheral position off a center of a visual field of the subject and changing a size of the visual target with the combination of the color of the visual target and the color of the background being maintained. ### Claim 4 (depends on 1) The visual target display device according to claim 1, wherein the color of the background is a chromatic color. ### Claim 5 (depends on 1) The visual target display device according to claim 1, wherein the color of the visual target and the color of the background are set to a combination of chromatic colors which are in the relationship of confusion colors located on opposite sides of a region of an achromatic color in a chromaticity diagram. ### Claim 6 (depends on 1) The visual target display device according to claim 1, wherein the color of the visual target and the color of the background are set to a combination of chromatic colors which are in the relationship of confusion colors in a same region out of two chromatic regions which are sectioned with a region of an achromatic color in a chromaticity diagram located therebetween. ### Claim 7 (depends on 1) The visual target display device according to claim 1, wherein the color of the visual target and the color of the background are set to a same chroma. ### Claim 8 (depends on 1) The visual target display device according to claim 1, wherein the color of the visual target and the color of the background are set to different chromas. ### Claim 9 A visual target display device comprising a display section configured to display a visual target, of a chromatic color, for testing a color-related visual function of a subject and a background around the visual target, wherein a brightness of the background is a numerical value between a numerical value 10% less than a brightness of the visual target and a numerical value 10% greater than the brightness of the visual target, a combination of a color of the visual target and a color of the background is a combination of colors which are in a relationship of confusion colors in dichromatism, the visual target has a shape in which a plurality of minimum constituent units set to a same shape and a same color are arranged in columns and rows, and the visual target is a visual target for testing whether or not there is a region which the subject is not able to see in the visual target or a region which looks distorted in the visual target while the subject is looking at a center of the visual target. ### Claim 10 (depends on 9) The visual target display device according to claim 9, wherein the color of the background is a chromatic color. ### Claim 11 (depends on 9) The visual target display device according to claim 9, wherein the color of the visual target and the color of the background are set to a combination of chromatic colors which are in the relationship of confusion colors located on opposite sides of a region of an achromatic color in a chromaticity diagram. ### Claim 12 (depends on 9) The visual target display device according to claim 9, wherein the color of the visual target and the color of the background are set to a combination of chromatic colors which are in the relationship of confusion colors in a same region out of two chromatic regions which are sectioned with a region of an achromatic color in a chromaticity diagram located therebetween. ### Claim 13 (depends on 9) The visual target display device according to claim 9, wherein the color of the visual target and the color of the background are set to a same chroma. ### Claim 14 (depends on 9) The visual target display device according to claim 9, wherein the color of the visual target and the color of the background are set to different chromas. ### Claim 15 A visual target presentation method comprising: presenting a visual target, of a chromatic color, for testing a color-related visual function of a subject and a background around the visual target in such a way that a brightness of the background is a numerical value between a numerical value 10% less than a brightness of the visual target and a numerical value 10% greater than the brightness of the visual target and a combination of a color of the visual target and a color of the background is a combination of colors which are in a relationship of confusion colors in dichromatism; and obtaining a threshold value, which is a size of the visual target based on which a determination on whether or not the subject is able to perceive the visual target is made, by changing a size of the visual target presented to the subject while maintaining the combination of the color of the visual target and the color of the background. ### Claim 16 A computer-readable storage medium having stored therein a program for causing a computer to function as display control means configured to cause a display section to display a visual target, of a chromatic color, for testing a color-related visual function of a subject and a background around the visual target in such a way that a brightness of the background is a numerical value between a numerical value 10% less than a brightness of the visual target and a numerical value 10% greater than the brightness of the visual target and a combination of a color of the visual target and a color of the background is a combination of colors which are in a relationship of confusion colors in dichromatism, wherein the display control means changes a size of the visual target while maintaining the combination of the color of the visual target and the color of the background, so as to obtain a threshold value which is a size of the visual target based on which a determination on whether or not the subject is able to perceive the visual target is made.