About Ishihara Color Blindness Test
The Ishihara test is a color perception test for red-green color deficiencies, the first in a class of successful color vision tests called pseudo-isochromatic plates. It was named after its designer, Dr. Shinobu...
The Ishihara test is a color perception test for red-green color deficiencies, the first in a class of successful color vision tests called pseudo-isochromatic plates. It was named after its designer, Dr. Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917.
The test consists of a number of colored plates, called Ishihara plates, each of which contains a circle of dots appearing randomized in color and size. Within the pattern are dots which form a number or shape clearly visible to those with normal color vision, and invisible, or difficult to see, to those with a red-green color vision defect. Other plates are intentionally designed to reveal numbers only to those with a red/green color vision deficiency, and be invisible to those with normal red/green color vision. The full test consists of 38 plates, but the existence of a severe deficiency is usually apparent after only a few plates. There is also an Ishihara test consisting 10, 14 or 24 test plates.
The plates make up several different test designs:
* Demonstration plate (plate number one, typically the numeral "12"); designed to be visible by all persons, whether normal or color vision deficient. For demonstration purposes only, and usually not considered in making a score for screening purposes.
* Transformation plates: individuals with color vision defect should see a different figure from individuals with normal color vision.
* Vanishing plates: only individuals with normal color vision could recognize the figure.
* Hidden digit plates: only individuals with color vision defect could recognize the figure.
* Diagnostic plates: intended to determine the type of color vision defect (protanopia or deuteranopia) and the severity of it.
Previous Versions
Here you can find the changelog of Ishihara Color Blindness Test since it was posted on our website on 2019-11-06 13:11:19.
The latest version is 1.5.2.0 and it was updated on 2024-04-19 21:51:45. See below the changes in each version.
Ishihara Color Blindness Test version 1.5.2.0
Updated At: 2019-02-25
Changes: v1.5.x - Program code optimized, app size reduced.
v1.4.x - Galaxy Marshmallow problem fixed.
v1.3.x - Tablet UI added.
v1.2.x - User interface improved.
v1.1.x - Locale RU added.
v1.0 - 24 plates test & 38 plates test
Disclaimer
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