The Ishihara Color Blindness Test, developed by SoftInfoSystems, is a free Android application for those who want to determine if they have a color vision deficiency. The test is named after its designer, Dr. Shinobu Ishihara, who first published his tests inThe app is designed to test for red-green color deficiencies, the most common type of color blindness, through a series of pseudo-isochromatic plates.

The test consists of 38 different plates, each with a circle of dots appearing randomized in color and size. Within the pattern are dots that form a number or shape that is clearly visible to those with normal color vision, and invisible or difficult to see for those with a red-green color vision defect. The plates make up several different test designs, including demonstration plates, transformation plates, vanishing plates, hidden digit plates, and diagnostic plates. The full test is usually unnecessary, as the existence of a severe deficiency is typically apparent after only a few plates.

Overall, the Ishihara Color Blindness Test is an excellent tool for those who want to determine if they have a color vision deficiency. The app is easy to use, accurate, and comprehensive, making it an ideal choice for anyone looking to test their color perception.