Red-Green Visual Impairment

Principle

Red-green vision impairment, also known as red-green color vision deficiency, is a form of color blindness in which those affected have difficulty distinguishing between different shades of red and green. This is due to a deficiency or defect in the cones of the eye, the light receptors responsible for perceiving colors. People with normal color vision have three types of cones that react to red, green or blue light. In the case of red-green vision impairment, the cones for red and green are not functioning normally.