Ishiharatestissä

The Ishihara test is a color vision test used to detect red-green color blindness. It was developed by Japanese ophthalmologist Shinobu Ishihara in 1917. The test consists of a series of colored plates, each containing a pattern of dots. Within the pattern, some dots are arranged to form a number or shape, while the surrounding dots are of a different color and form a background. Individuals with normal color vision can easily discern the hidden number or shape, while those with red-green color blindness will have difficulty or be unable to see it.

There are different versions of the Ishihara test, varying in the number of plates and the specific colors used. The most common test includes 38 plates. The plates are designed to differentiate between various types of red-green color vision deficiencies, including protanopia, deuteranopia, and their milder forms, protanomaly and deuteranomaly. The test is simple, quick to administer, and widely used by optometrists, ophthalmologists, and employers for screening purposes. It is an important tool in diagnosing color vision deficiencies, which can have implications for certain professions and daily activities.