Color vision deficiency is the inability to distinguish certain shades of color or in more severe cases, see colors at all. Color vision is possible due to photoreceptors in the retina of the eye known as cones. These cones have light sensitive pigments that enable us to recognize color. Found in the macula, the central portion of the retina, each cone is sensitive to either red, green or blue light, which the cones recognize based upon light wavelengths.
Testing will include the use of a series of specially designed pictures composed of colored dots, called pseudisochromatic plates, which include hidden numbers or embedded figures that can only be correctly seen by persons with normal color vision.
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