Color-viewing function measuring means and color-viewing function measurement system

Patent metadata

Field	Value
Publication number	US-9596985-B2
Application number	US-201314395641-A
Country	US
Kind code	B2
Filing date	Apr 17, 2013
Priority date	Apr 18, 2012
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

[Problem] To be able to accurately measure color vision and color-viewing field for different colors.
[Solution] The color-viewing function measuring means ( 1 ) pertaining to the present invention displays a plurality of chromatically colored targets (A 11 , . . . ) (for example, Landolt rings) in an achromatic background (B), the brightness of the targets (A 11 , . . . ) being set so as to be substantially equal to the brightness of the background (B). When vision or the viewing field is measured with this color-viewing function measuring means ( 1 ), vision and viewing field can be accurately measured for different colors.

First claim

The invention claimed is:

1. Color-viewing function measuring means that indicates a plurality of targets that are colored in chromatic colors on a background and color vision and/or a color-viewing field that is a color-viewing function of an examinee is measured by testing whether the examinee can perceive each target, comprising:
a display that is comprised of at least one of a liquid crystal display, a plasma display, an organic EL display and a CRT,
a background indicator that indicates the background on the display,
a target indicator that indicates the targets having a predetermined brightness, a predetermined color and a predetermined size on the display,
an indication time controller that restricts time to indicate the target through the target indicator,
a perception detector that outputs signal indicating that the examinee perceived the indicated target,
and a color-viewing function judger that judges the color vision and/or the color-viewing field based upon the signals from the perception detector,
wherein the background is an achromatic color, all of the plurality of targets or at least a predetermined number of the plurality of targets being colored in almost the same chromatic color; and the brightness of the targets being almost equal to the brightness of the background; whereby color vision and/or a color-viewing field regarding the chromatic color is measured.

2. The color-viewing function measuring means according to claim 1 , wherein the brightness of all of the plurality of targets or the brightness of the predetermined number of targets are set almost equal to each other, and the following formula holds if the brightness of the target is α[cd/m2] and the brightness of the background is β[cd/m2]
−10≦α−β≦+10  [Formaula1].

3. The color-viewing function measuring means according to claim 2 , wherein all of the plurality of targets or the predetermined number of targets are set to be almost equal to each other in their sizes, and the color-viewing field regarding the chromatic color of the examinee is measured by testing whether the examinee can perceive respective targets presented at various positions.

4. The color-viewing function measuring means according to claim 1 , wherein all of the plurality of targets or the predetermined number of targets are set to be different in their sizes, and the color vision regarding the chromatic color of the examinee is measured by testing whether the examinee can perceive each target.

5. The color-viewing function measuring means according to claims 4 , wherein all of the plurality of targets or the predetermined number of targets are set to be almost equal to each other in their sizes, and the color-viewing field regarding the chromatic color of the examinee is measured by testing whether the examinee can perceive respective targets presented at various positions.

6. The color-viewing function measuring means according to claim 1 , wherein a target indication time memory stores target indication time for each color, and wherein an indication time controller that restricts the time to indicate the target through the target indicator to the target indication time for each color that is stored in the target indication time memory.

7. A color-viewing function measurement system, comprising:
result input means that inputs measurement results regarding a color-viewing function that was measured through the color-viewing function measuring means according to claim 1 ;
wherein the result input means inputs measurement results regarding the vision or the field of view that does not receive the influence of color taste, that is measured with the targets in almost achromatic color, or with the targets which are different from the background in brightness more than a predetermined brightness phases; and
result comparison means that compares the measurement results regarding the color-viewing function and the measurement results regarding normal vision function with each other or indicates both.

8. The color-viewing function measurement system according to claim 7 , comprising:
result input means that inputs measurement results regarding the color-viewing function that was measured through the color-viewing function measuring means and
result indication means that indicates a chromaticity diagram in the x-y axis plane, and the measurement results inputted through the result input means in the z axis plane.

9. The color-viewing function measurement system, comprising:
result input means that inputs measurement results regarding the color-viewing function that was measured through the color-viewing function measuring means according claim 1 ;
age input means that inputs age of the examinee that was measured through the color-viewing function measuring means;
reference data storage that stores reference data regarding the color-viewing function previously for each age;
a reference data extraction that extracts the reference data corresponding to age data from the reference data storage based upon the age data inputted through the age input means; and
data comparison means that compares the measurement results inputted through the result input means and the reference data extracted through the reference data extraction with each other.

Assignees

• Univ Shinshu
• Kowa Co
• Ichikawa Kazuo
• Kazuo Ichikawa
• Kowa Co

Inventors

• Ichikawa Kazuo
• Tanaka Kiyoshi
• Yoshiki Tanaka

Classifications

• A61B3/066 Primary

  for testing colour vision · CPC title

• A61B3/032

  Devices for presenting test symbols or characters, e.g. test chart projectors (A61B3/036 takes precedence) · CPC title

• A61B3/0041

  characterised by display arrangements · CPC title