JP5436712B1 - Inspection means and program - Google Patents

Abstract

An inspection means, an inspection method, and a program capable of inspecting a color field are provided.
Grids 1a to 15a having different chromatic colors are displayed on sheets 1 to 15, respectively. The backgrounds 1b to 15b of the grids have the same luminance as the grids 1a to 15a. By presenting this sheet to the subject and responding to the area in which the subject cannot be seen, the color field of each color can be inspected.
[Selection] Figure 1

Description

The present invention inspection means, about your and program.

  In ophthalmic medicine, for example, an inspection means called an Amsler chart is used for inspection of age-related macular degeneration or the like. The Amsler chart is a chart composed of a grid of 20 squares in both vertical and horizontal directions. When a patient with age-related macular degeneration, etc. sees, the presence or absence of symptoms can be examined by distorting or missing a part of the grid. The following Patent Document 1 shows a modified example of the Amsler chart.

  There is also an examination means called M-CHARTS (registered trademark) as means for quantitatively measuring the degree of progression of age-related macular degeneration and the like. M-CHARTS is a chart composed of a plurality of dotted lines, and the interval between the dots is different for each dotted line. When this chart is shown to a patient with optic malopia such as age-related macular degeneration in order from a dotted line with a narrow dot interval, it generally appears distorted at the dotted line with a narrow dot interval, but the distortion does not perceive as the dot interval increases. . As the symptoms of metastasis progress, the perception of distortion will not disappear unless the point spacing is increased. This property enables quantitative measurement of the degree of progression of metastasis. The following patent document 2 shows specific contents of M-CHARTS.

Japanese Patent Laid-Open No. 2003-265412 Japanese Patent No. 3320060

  When the subject sees the Amsler chart and does not see the grid of a part of the area, the patient's visual field can be inspected, for example, in the form of an abnormality in the part corresponding to that area on the retina. However, since the grid is displayed in black and the background is white in the Amsler chart, the visual field that can be inspected by the Amsler chart is a visual field that is independent of color.

  As is well known, a large number of pyramidal cells that perceive three colors of red, green, and blue are arranged in the retina, whereby the human visual function has a function of perceiving various chromatic colors. Therefore, even in the human visual field, an abnormality may occur in which a certain area cannot be perceived by one color and another area cannot be perceived by another color. Cannot be inspected).

  M-CHARTS is subject to inspection for visual distortion at the center of the visual field, and is not subject to inspection of the entire visual field. Therefore, of course, the color field is not an object to be inspected. Developing Amsler charts and M-CHARTS so that color field of view can be inspected is considered to be extremely significant for the advancement of ophthalmic medicine. In the first place, as far as the present inventor knows, there has been no proposal of an inspection means for a color field.

  Therefore, in view of the above, the problem to be solved by the present invention is to provide an inspection means, an inspection method, and a program capable of inspecting a color field.

In order to solve the above-described problems, the inspection means according to the present invention provides a target for chromatic color visual field inspection by a subject who inspects a chromatic color visual field, with a predetermined distance apart. The target that the subject simultaneously perceives with the eye in a predetermined viewing angle region for the subject is displayed in a single chromatic color, and the chromatic color is different from the chromatic color in a region other than the target A second display unit that displays a background by color, and the luminance value of the background displayed on the second display unit is a numerical value that is 10% smaller than the luminance value of the target displayed on the first display unit; It is a numerical value belonging to a numerical value 10% larger. According to the present invention, the color field of the subject can be inspected with the chromatic target, and the luminance values of the target and the background are adjusted to the same numerical value. The perception of the difference can be examined appropriately.

  The first display unit may display a plurality of targets with different chromatic colors. According to the present invention, a plurality of chromatic color fields can be inspected.

  The second display unit may display the background in an achromatic color. According to the present invention, by setting the background to an achromatic color, the color field of chromatic color can be inspected with high accuracy.

  The visual target may include a grid with dotted lines. According to the present invention, it is possible to quantitatively inspect the size of the abnormal perception (defect, distortion) region of the color field by inspecting the perception of the dotted grid.

  The visual target may include a plurality of grids with dotted lines having different point intervals. According to the present invention, the size of the non-normally perceived (defect or distortion) region of the color field disappears by examining how much the point interval is increased to eliminate the non-normally perceived (defect or distortion) region of the color field. Can be examined quantitatively.

  The first display unit and the second display unit may display the visual target and the background by printing on a sheet. According to the present invention, it is possible to easily inspect a color field using a sheet on which a chromatic target is printed.

  In addition, the first display unit and the second display unit may display the target and the background using light emission caused by power being supplied. According to the present invention, for example, a color visual field can be easily inspected by displaying a chromatic target on a display unit of a computer.

  Further, the inspection method according to the present invention includes a visual target displayed by a chromatic color for a subject inspecting a visual field of chromatic color to perceive with eyes, and a color different from the chromatic color in a region other than the visual target. A presentation step for presenting the background displayed to the subject, and a response step for the subject to respond to a region of the visual target presented by the presentation step that cannot be normally perceived by the eye. In the presenting step, the displayed luminance value of the background is a numerical value that falls between a numerical value that is 10% smaller and a numerical value that is 10% larger than the luminance value of the target. According to the present invention, the color field of the subject can be inspected with the chromatic target, and the luminance values of the target and the background are adjusted to the same numerical value. The perception of the difference can be examined appropriately.

Further, the program according to the present invention includes a visual target for color visual field inspection using a chromatic color for a subject who examines a chromatic color visual field to perceive with eyes, and the chromatic color in a region other than the visual target. A display step in which a background with different colors is displayed in a single chromatic color for a visual target perceived by the subject at the same time in a predetermined viewing angle region for the subject at a predetermined distance away from the visual target ; And changing the chromatic color displayed in the display step to another chromatic color, and causing the computer to execute the step, wherein the luminance value of the background is 10% smaller than the luminance value of the target and 10%. It is a numerical value belonging to a large numerical value. According to the present invention, the color field of the subject can be inspected with the chromatic target, and the luminance values of the target and the background are adjusted to the same numerical value. A program that can properly inspect the perception of the difference can be realized.

The figure which shows Example 1 of the test | inspection means of this invention. The figure which shows Example 2 of the test | inspection means of this invention. The figure which shows Example 3 of the test | inspection means of this invention. The elements on larger scale of FIG. The figure which shows Example 4 of the test | inspection means of this invention. The flowchart which shows the 1st example of the test | inspection procedure in the test | inspection means of this invention. The flowchart which shows the 2nd example of the test | inspection procedure in the test | inspection means of this invention. The figure which shows Example 5 of the test | inspection means of this invention. The figure which shows Example 6 of the test | inspection means of this invention. The figure which shows Example 7 of the test | inspection means of this invention. The elements on larger scale of FIG. The figure which shows Example 8 of the test | inspection means of this invention. The figure which shows Example 9 of the test | inspection means of this invention. The figure which shows the example of the test result of the color visual acuity according to background brightness | luminance.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an inspection chart 100 as a first embodiment of the inspection means of the present invention.

  The inspection chart 100 includes 15 sheets from sheet 1 to sheet 15. Each sheet is printed with a grid similar to a conventional Amsler chart. However, while the grid according to the Amsler chart is printed in black, in the sheets 1 to 15, the grid is printed in different chromatic colors (as is well known, the three attributes of color (lightness, saturation, hue) ), The color having only lightness is an achromatic color (for example, black, gray, white), and the non-achromatic color is a chromatic color). Thus, the color field of the subject can be inspected using the inspection chart 100.

  Specifically, the grid 1a of the sheet 1 is printed in red (R). The grid 2a of the sheet 2 is printed in yellow red (YR). The grid 3a of the sheet 3 is printed in red yellow (RY). The grid 4a of the sheet 4 is printed in yellow (Y). The grid 5a of the sheet 5 is printed in green yellow (GY). The grid 6a of the sheet 6 is printed in yellow green (YG). The grid 7a of the sheet 7 is printed in green (G). The grid 8a of the sheet 8 is printed in blue-green (BG).

  The grid 9a of the sheet 9 is printed in green and blue (GB). The grid 10a of the sheet 10 is printed in blue (B). The grid 11a of the sheet 11 is printed in purple blue (PB). The grid 12a of the sheet 12 is printed in blue-violet (BP). The grid 13a of the sheet 13 is printed in purple (P). The grid 14a of the sheet 14 is printed in magenta (RP). The grid 15a of the sheet 15 is printed in purple red (PR).

  The above grid colors are red (R), yellow-red (YR), red-yellow (RY), yellow (Y), green-yellow (GY), yellow-green (YG), green (G), blue-green (BG ), Green blue (GB), blue (B), purple blue (PB), blue purple (BP), purple (P), red purple (RP), purple red (PR) are 15 colors used in the so-called New Color Test. It is.

  In each sheet 1-15, areas other than the grids 1a-15a are the backgrounds 1b, 2b, 3b, 4b, 5b, 6b, 7b, 8b, 9b, 10b, 11b, 12b, 13b, 14b, 15b. These backgrounds 1b to 15b may all have the same color (for example, achromatic color). The material of the sheets 1 to 15 may be any material that is conventionally used as a material for the sheet, such as paper or plastic.

  The size of each square constituting the grids 1a to 15a is not limited at all. For example, when the subject's eyes are separated from the sheets 1 to 15 by about 30 cm, the viewing angle between adjacent horizontal lines and vertical lines is 1 degree. It is preferable that the size is as follows.

  In the inspection chart 100, the grid is printed in different colors. Thereby, the color field of each color of the grid can be inspected. If the subject cannot perceive the upper right area when he / she looks at the sheet 1, for example, the subject is inspected in the form of an abnormality in the upper right area in the red color field of the subject. In order to enable such an inspection of an appropriate color field, in the inspection chart 100, the luminance of the grids 1a to 15a and the luminance of the backgrounds 1b to 15b are the same. The experimental basis is shown in FIG.

  FIG. 14 shows red (R), yellow-red (YR), red-yellow (RY), yellow (Y), green-yellow (GY), yellow-green (YG), green (G) for a plurality of subjects. ), Blue-green (BG), green-blue (GB), blue (B), purple-blue (PB), blue-violet (BP), purple (P), magenta (RP), purple-red (PR) An example of a measurement result when the measurement is performed is shown. The horizontal axis is each color, the vertical axis is a logarithmic plot of visual acuity (the right vertical axis is the average value of visual acuity, and the left vertical axis is the standard deviation value of visual acuity).

  In this visual acuity test, the Landolt ring was colored with each color indicated on the horizontal axis, and the background color was a white point D65. At that time, the brightness of the color of the Landolt ring was 30 candela per square meter, and the brightness of the background color was two ways, 100 candela per square meter and 30 candela. A plot when the background color luminance is 100 candela per square meter and a plot when the background color is 30 candela are shown on the upper side and lower side of the drawing, respectively.

  As can be seen from the figure, when the brightness of the background color is 100 candela per square meter, the visual acuity (color visual acuity) of each color is almost the same, but when the brightness of the background color is 30 candela per square meter The color vision of each color is significantly different. Specifically, color vision is relatively high in colors such as R (red) and GB (green-blue) and in the vicinity thereof (near on the chromaticity diagram), whereas GY (green-yellow) and BP The color vision is relatively low for (blue-purple) and nearby colors. When the brightness of the background color is 100 candela per square meter, the brightness is clearly different between the Landolt ring and the background. When the brightness of the background color is 30 candela per square meter, the Landolt ring and the background are equal. .

  Therefore, when comparing the two results, if the brightness of the Landolt ring and the brightness of the background are clearly different, the subject can perceive the difference in brightness even if the color difference between the Landolt ring and the background is not perceived. The direction of the Landolt ring is recognized by this, and it is considered that the color vision of each color is almost the same. On the other hand, if the brightness of the Landolt ring and the background brightness are the same, how much the subject perceives the difference between the color of the Landolt ring and the background will be accurately reflected in the test result. It is considered that the color vision is different for each color.

  The scope of application of this knowledge, that is, the fact that the same brightness of the test target and the background is effective for the color vision test should not be clearly limited to the color vision test. It is thought that it is also effective knowledge. Therefore, this knowledge is also utilized in the color visual field inspection chart 100 of FIG. 1, and the brightness of the grids 1a to 15a and the brightness of the backgrounds 1b to 15b are made the same for high-accuracy inspection of the color visual field.

  When matching the brightness in a pair of grid and background (for example, a pair of grid 1a and background 1b), for example, the color of the grid is determined first, and then the background color (for example, brightness) is determined by trial and error. A method may be used in which adjustment is made to obtain a background color in which the brightness values of the grid and the background (Y of the tristimulus values of X, Y, and Z) coincide with each other by measurement using a spectral radiance meter or the like. In this case, the background color of each sheet is different.

  The inspection chart 100 may be used by changing so that the visual field inspection by the conventional Amsler chart is performed for each color. That is, for example, the sheet 1 is first shown to the subject. At that time, the subject looks at the center point of the grid 1a so that the adjacent vertical and horizontal lines in the grid have a viewing angle of 1 degree for the subject.

  In this state, the subject is asked whether or not there is an invisible area or an area that appears distorted in the grid 1a, and if so, that area is specifically answered. The response method may be written in words, or may be a format in which a paper on which a grid is printed is prepared and the area is written on the paper. As a result, the R (red) color field of the subject is first inspected. Hereinafter, the same inspection procedure may be performed for sheets 2 to 15.

  By such a procedure, the color visual field of each color of the inspection chart 100 can be inspected. As described above, the present inventor has actually used a color visual field for a subject using the test chart 100 having the same brightness as the grid and the background and the test chart for comparison with the grid and the background having different brightness. As a result of the above inspection, the color visual field of each color was almost the same in the comparative inspection chart, whereas a different color visual field was detected for each color in the inspection chart 100. This shows the remarkable effect of the inspection chart of the present invention.

  The inspection chart of the present invention is not limited to the 15 colors shown in FIG. In Example 2 of FIG. 2, the number of colors is reduced. Specifically, the inspection chart 100 'has four colors of R, GY, GB, and BP. These four colors are the four colors having significantly different color vision in the example of FIG. Therefore, by performing a color field inspection using this inspection chart 100 ', an inspection result that significantly reflects the color field of the subject can be obtained.

  In the above embodiment, the Amsler chart is improved for color field inspection, but in Embodiment 3 shown in FIG. 3, M-CHARTS is improved for color field inspection. FIG. 4 is a partially enlarged view of FIG.

  The inspection chart 200 of FIG. 3 is obtained by increasing all the sheets 1 to 15 to three in the inspection chart 100 of FIG. Specifically, the sheet 1 is a sheet 1, 1 ′, 1 ″, the sheet 2 is a sheet 2, 2 ′, 2 ″, etc., and a grid 1a drawn on the sheet 1, 1 ′, 1 ″, 1c and 1d are drawn in R (red). Grids 2a, 2c and 2d drawn in the sheets 2, 2 ′ and 2 ″ are drawn in YR (yellow red). The grids 3a, 3c, 3d drawn on the sheets 3, 3 ′, 3 ″ are drawn in RY (red yellow). The grids 4a, 4c, 4d drawn on the sheets 4, 4 ′, 4 ″ are Y It is drawn in (red). The grids 5a, 5c, 5d drawn on the sheets 5, 5 ', 5 "are drawn in GY (green yellow). The grids 6a, 6c, 6d drawn on the sheets 6, 6', 6" are YG It is drawn in (yellowish green).

  Grids 7a, 7c, 7d drawn on the sheets 7, 7 ', 7 "are drawn in G (green). Grids 8a, 8c, 8d drawn on the sheets 8, 8', 8" are drawn on BG ( (Blue green). Grids 9a, 9c, 9d drawn on the sheets 9, 9 ′, 9 ″ are drawn in GB (greenish blue). Grids 10a, 10c, 10d drawn on the sheets 10, 10 ′, 10 ″ are shown in B ( Blue). Grids 11a, 11c, and 11d drawn on the sheets 11, 11 ′, and 11 ″ are drawn in PB (purple blue). Grids 12a, 12c, and 12d drawn on the sheets 12, 12 ′, and 12 ″ are shown as BP. It is drawn in (blue purple). The grids 13a, 13c, 13d drawn on the sheets 13, 13 ', 13 "are drawn in P (purple). The grids 14a, 14c, 14d drawn on the sheets 14, 14', 14" are shown as RP ( It is drawn in (reddish purple). Grids 15a, 15c, 15d drawn on the sheets 15, 15 ', 15 "are drawn in PR (purple red).

  The grids 1a to 15a are solid lines similar to those in FIG. On the other hand, the sheets 1 'to 15' and the sheets 1 "to 15" are dotted grids. As shown in FIG. 4, the point interval d1 in the dotted grids 1c to 15c is smaller than the point interval d2 in the dotted grids 1d to 15d. In FIG. 3, each color has three sheets. However, this is only an example, and more sheets (for example, 10, 15, 20, etc.) are used. What is necessary is just to make it the form by which the grid by the extended dotted line was drawn.

  The inspection chart 200 is used for quantitative inspection of the color field. An example of a color visual field inspection using the inspection chart 200 is as follows. In a set of sheets of a specific color included in the inspection chart 200, first, a solid grid, a dotted grid with a narrow dot interval, and a dotted grid with a wider dot interval are presented to the subject in this order. . The positional relationship between the sheet and the subject may be the same as in the above embodiment.

  If the subject has an impairment in the color field of the color, some of the entire area of the first solid grid cannot be perceived normally (ie, cannot be seen or distorted). Ask the subject to explain the area that cannot be perceived normally by drawing on words or paper. If the subject can normally perceive the entire area of the solid grid, the color inspection is completed. If the subject cannot perceive a part of the solid grid normally, the dotted grid is presented in order from the narrowest dot spacing.

  In the M-CHARTS inspection principle, the subject does not perceive the distortion of the dotted line as the point interval on the dotted line increases. Similarly, in the inspection chart 200, the size (width) of the region that cannot be normally perceived by the subject. If the point spacing is wider than), the subject will not recognize that there is a missing or distorted area in the grid. Therefore, by presenting the subject with a dotted grid in which the dot intervals are expanded in order in the inspection chart 200, the subject does not recognize any missing or distorted grid on any sheet, and the point at that time The degree of the non-normal perception area (width) of the color field of the subject in the subject can be quantitatively inspected by the interval. The above inspection procedure may be performed for all colors of the inspection chart 200.

  Although the above embodiment is a form in which a grid is printed on a sheet, the present invention is not limited to such a form. An inspection apparatus 300 shown in FIG. 5 is an apparatus for performing a color visual field inspection using the sheets of FIGS. 1 to 4 using a computer and its display unit.

  The apparatus 300 has a structure similar to that of a normal computer, and includes a CPU 301, a RAM 302, a ROM 303, a display unit 304, and an input unit 305 as components related to the present invention. The CPU 301 executes various calculations, and the RAM 302 is a volatile storage unit that functions as a work area for the CPU 301. A ROM 303 is a non-volatile storage unit that stores programs and data related to the present invention, and stores programs 310 and 311 related to color field inspection, in particular. The ROM 303 may be another type of nonvolatile storage unit such as a hard disk.

  The display unit 304 is a display unit including a portion (for example, a liquid crystal backlight) that emits light when supplied with power, such as a liquid crystal display. The display unit 304 displays the grids 1a to 15a and backgrounds 1b to 15b for each color. The input unit 305 is a part for inputting a response from the subject, and is, for example, a touch panel arranged so as to overlap the display unit.

  An example of a specific procedure of color field inspection using the apparatus 300 is shown in FIGS. The inspection procedure in FIG. 6 is a procedure in which the inspection using the sheets in FIGS. 1 and 2 is replaced by a computer, and the inspection procedure in FIG. 7 is a procedure in which the inspection using the sheets in FIGS. is there. Assume that the inspection procedures in FIGS. 6 and 7 are described in the programs 310 and 311, respectively. The CPU 301 may call it and execute it automatically. The apparatus 300 may store both or at least one of the programs 310 and 311.

  In the examination procedure of FIG. 6, first, a subject (subject) is placed at a position facing the display unit 304. The positional relationship between the subject and the display surface of the display unit may be the same as the positional relationship between the sheet and the subject in FIG. First, in step S10, the CPU 301 sets the variable n to 1. Subsequently, in S30, the CPU 301 displays the nth sheet (the sheet n in FIG. 1) on the display unit 304. That is, the nth pair of the grids 1 a to 15 a and the backgrounds 1 b to 15 b is displayed on the display unit 304.

  At that time, as in the case of the sheet on which the grid and background are printed as in FIG. 1 and the like, the luminance values of the grid and the background are displayed with the same value. The subject who sees this display responds whether the entire area of the displayed grid can be perceived normally (is visible) or whether some areas cannot be perceived normally. When a part of the area cannot be normally viewed, the outer edge of the area that cannot be normally viewed is input to the apparatus 300 by, for example, tracing the outer edge of the area on the touch panel 305 with a finger.

  When the response by the subject is completed, the CPU 301 determines whether or not the inspection of all the sheets (that is, the inspection of the color field of all colors) is completed in S70, and the inspection of all the sheets is already completed (S70: YES). ) Finishes the inspection procedure of FIG. 6, and when there is still a sheet (remaining color) (S70: NO), the process proceeds to S80. When the process proceeds to S80, the variable n is incremented by 1, and the process returns to S20 to repeat the above procedure. The above is the processing procedure of FIG.

  In the processing procedure of FIG. 7, S20, S30, S50, and S60 are added to or changed from the processing procedure of FIG. Only the additional part will be described. In S20, the CPU 301 sets the variable d to 0. This variable d is a number assigned 1, 2,... In order from the narrowest point interval in the dotted grid of each color. The solid line d is zero. In step S <b> 30, the CPU 301 displays on the display unit 304 a grid that has the n-th color and the d-th smallest dot interval. In the example of FIG. 3, for example, the grid having the variable d of 1 in the second color is the grid 2c.

  In S50, the CPU 301 determines whether or not the grid having the maximum value of d has been completed. If the grid having the maximum value of d has already been completed (S50: YES), the process proceeds to S70, and if not completed (S50: NO), the process proceeds to S60. After proceeding to S60, d is incremented by 1, and the process returns to S30. The above is the inspection procedure of FIG. The color visual field inspection of the present invention can be performed in the form displayed on the computer by the procedure shown in FIGS.

  In the embodiment described above, the brightness of the grid and the background is the same. However, as a result of examination by the present inventor, it can be said that the color field inspection can be suitably performed even if the brightness value is shifted by about 10%. We have knowledge. Therefore, in the embodiment of the present invention, the luminance value of the background may be set within a range of plus or minus 10% of the luminance value of the grid.

  In the embodiments described so far, the target for color field inspection is a grid, but the present invention is not limited to this. The example of FIG. 8 is an example in which the target is changed to a circle displayed side by side in the example of FIG. Specifically, the inspection sheet 400 in FIG. 8 includes 15 sheets 401 to 415. On each sheet, a circle as a visual target is displayed (printed) aligned in a matrix form vertically and horizontally.

  Visual target (circle) 401a (402a, 403a, 404a, 401a, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415) displayed on the sheet 401 405a, 406a, 407a, 408a, 409a, 410a, 411a, 412a, 413a, 414a, 415a) are red (R) (, yellow red (YR), red yellow (RY), yellow (Y), green yellow ( GY), yellowish green (YG), green (G), blue-green (BG), patina (GB), blue (B), purple-blue (PB), blue-violet (BP), purple (P), red-purple (RP) ), Purple red (PR)).

  In each of the sheets 401 to 415, the areas other than the grids 401a to 415a are the backgrounds 401b, 402b, 403b, 404b, 405b, 406b, 407b, 408b, 409b, 410b, 411b, 412b, 413b, 414b, and 415b. These backgrounds may be achromatic as in the case of FIG. The luminance of the background and the target may be the same as in the above example (or the luminance value of the background is within a range of plus or minus 10% of the luminance value of the grid).

  The size of the arrangement of the targets (circles) 401a to 415a is not limited at all. For example, when the subject's eyes are separated from the sheets 1 to 15 by about 30 cm, the viewing angle between adjacent circles vertically or horizontally is 1 It is preferable that the degree is set. The materials of the sheets 401 to 415 may be the same as those in the above example.

  The method of using the inspection sheet 400 is the same as in the example of FIG. 1, and the examinee looks at each sheet, for example, sequentially from the sheet 401, and the circle on the sheet is not visible, or the circle appears distorted (the circle itself is distorted). By responding to a region that appears distorted (the array of circles appears distorted), a color field of 15 colors can be examined. 1 may be reduced as shown in FIG. 9, and the example shown in FIG. 8 may be reduced as shown in FIG.

  Next, FIGS. 10 and 11 are examples in which the target is changed from a lattice to a circle in the example of FIG. In the example of FIG. 3, the interval between the points on the dotted line is changed, whereas in the example of FIGS. 10 and 11, the interval between the targets (circles) is changed. That is, in the inspection sheet 500, the sheet 401 (, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415) has a target (circle) 401a (, 402a, 403a, 404a, 405a, 406a, 407a, 408a, 409a, 410a, 411a, 412a, 413a, 414a, 415a) are displayed in a matrix of 20 vertical and 20 horizontal.

  And on the sheet 401 ′ (402 ′, 403 ′, 404 ′, 405 ′, 406 ′, 407 ′, 408 ′, 409 ′, 410 ′, 411 ′, 412 ′, 413 ′, 414 ′, 415 ′) The target (circle) 401a (, 402a, 403a, 404a, 405a, 406a, 407a, 408a, 409a, 410a, 411a, 412a, 413a, 414a, 415a) is displayed in a matrix of 16 columns and 16 columns. ing.

  Sheet 401 ″ (402 ″, 403 ″, 404 ″, 405 ″, 406 ″, 407 ″, 408 ″, 409 ″, 410 ″, 411 ″, 412 ″, 413 ″, 414 ″, 415 ″) A target (circle) 401a (, 402a, 403a, 404a, 405a, 406a, 407a, 408a, 409a, 410a, 411a, 412a, 413a, 414a, 415a) is displayed in a matrix of 12 columns and 12 columns. Therefore, in Fig. 11, the distance between the targets is narrowed in the order of d3, d4, and d5.

  The method of using the inspection chart 500 may be the same as that of the above-described inspection chart 200 or the like. In other words, in the sheet set of each color of the inspection chart 500, by presenting the subject in order from a sheet having a narrow circle interval, the subject can detect a defect in the circle arrangement or distortion ( (Distortion of circle itself, distortion of circle arrangement) region is not recognized. The degree of loss or distortion of the color field of the subject in the subject can be quantitatively inspected by the circle interval at that time. The above inspection procedure may be performed for all colors of the inspection chart 500. In the example of FIG. 10, three sheets of each color are used. However, the number of sheets of each color is arbitrary in the example of FIG. 10 as in FIG.

  In the above example, the target is a circle, but this is only an example, and the form of the target is not limited in the present invention. For example, a polygon (rectangle), an ellipse, etc. may be sufficient and a pattern, a picture (animal, plant, food, etc.) etc. may be sufficient. 12 and 13 show examples of symbols 501a (502a to 515a), 601a (602a to 615a), 601b (602b to 615b), and 601c (602c to 615c).

  As shown in FIG. 13, a plurality of symbols and patterns may be mixed in one sheet. In that case, you may display a different pattern and a pattern for every different area | region on a sheet | seat. Moreover, you may display a target with a different magnitude | size on the same sheet | seat. 12 and 13 are particularly suitable when the subject is a child. Even when the above-described visual target is used, an inspection form that is displayed using a computer as shown in FIGS. 5 to 7 as described above may be employed.

  The above embodiments may be modified and modified within the scope of the spirit described in the claims. For example, although 15 colors are shown in FIG. 1 and 4 colors are shown in FIG. 2, the number of colors is not limited in the present invention. A chromatic color may be used without limiting the background to an achromatic color. In the above, the dotted line may be a discontinuous line such as a broken line.

1a to 15a, 1c to 15c, 1d to 15d Grid (lattice, target)
401a-415a, 501a-515a, 601a-615a, 601b-615b, 601c-615c Target 1b-15b, 401b-415b Background 100, 200 Inspection chart (inspection means)
300 Inspection device (inspection means)
310,311 program

Claims (8)

Subject to check the color vision of chromatic colors to perceive by the eye, the target for color vision inspection by chromatic color in a predetermined viewing angle region for the subject separated by a predetermined distance, the subject A first display unit that simultaneously displays a visual target perceived by the eyes in a single chromatic color ;
A second display unit that displays a background of a color different from the chromatic color in an area other than the target;
The luminance value of the background displayed on the second display unit is a numerical value that falls between a numerical value that is 10% smaller and a numerical value that is 10% larger than the luminance value of the target displayed on the first display unit. Inspection means characterized by.   The inspection unit according to claim 1, wherein the first display unit displays a plurality of targets with different chromatic colors.   The inspection unit according to claim 2, wherein the second display unit displays the background in an achromatic color.   The inspection means according to any one of claims 1 to 3, wherein the target is a grid formed by dotted lines.   The inspection means according to claim 4, wherein the target is a plurality of grids with dotted lines having different point intervals.   The inspection means according to claim 1, wherein the first display unit and the second display unit display the target and the background by printing on a sheet.   The inspection unit according to any one of claims 1 to 5, wherein the first display unit and the second display unit display the target and the background by using light emitted by supplying power. Subject to check the color vision of chromatic color for perceived by the eye, the target for color vision inspection by chromatic color and a background by the chromatic color different from the region other than the optotype, the A display step in which a visual target that the subject simultaneously perceives with the eyes is displayed in a single chromatic color in a predetermined viewing angle region for the subject at a predetermined distance away from the visual target ;
A change step of changing the chromatic color displayed by the display step to another chromatic color;
In the display step, the background luminance value is a numerical value that falls between a numerical value that is 10% smaller than a numerical value that is 10% larger than the luminance value of the target.

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