What is a common way to test for color blindness?

The Ishihara color test is a widely used method for assessing color vision deficiencies, particularly color blindness. This test consists of a series of plates, each containing a pattern of colored dots arranged in a way that those with normal color vision can distinguish numbers or shapes against a background of dots of different colors. Individuals with color blindness may not be able to see the numbers or shapes clearly or at all, indicating a deficiency in perceiving certain colors.

Other choices, such as the Snellen chart, are used for testing visual acuity, measuring how well a person can see at a distance, which does not provide information about color vision. The keratoscope examination focuses on measuring the curvature of the cornea and is relevant in assessing conditions related to the surface of the eye rather than color perception. Retinoscopy is a technique used to measure refractive errors and determine the appropriate prescription for glasses, but it does not test for color blindness. Thus, the Ishihara test stands out as the specific tool designed for evaluating color perception.