The Ishihara test is a color vision test devised by Dr. Shinobu Ishihara in 1917. It is primarily used to diagnose color blindness, particularly red-green color deficiencies, which are the most common types of color vision impairment. The test consists of a series of plates, each displaying a circle of dots in various colors and sizes. Within these circles, there are numbers or patterns that are made up of dots of different colors.
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