For example, red-green can subdivided into Deuteranomaly, Protanomaly, Protanopia, and Deuteranopia. Deuteranomaly is the commonest of the four, with greens looking more like a red color to a person.

Research suggests that color blindness is most prevalent in Caucasian males. There are different types of color blindness, including red-green, blue-yellow, and complete color blindness.

Roses are red, violets are blue, bananas are yellow, and grass is green. For sighted people, nobody questions that they can both know an object’s color and understand the concept of color. But ...

WebMD explains color blindness, a condition in which a person -- males, primarily -- cannot distinguish colors.

To the color blind, the world can appear gray, brown, dull and some colors indistinguishable (like purple and blue).

EnChroma makes color-enhancing sunglasses for the vast majority of such people, who have trouble seeing red or green due to a genetic defect. The company has sold more than 1,000 pairs in two years.

Discover the different types of color blindness, including their causes, symptoms, and diagnosis. Learn how color vision deficiency affects daily life and how doctors treat it.

In reality, very few people are truly color “blind,” and unable to see any color. Most who have difficulty differentiating colors have what is more accurately described as color vision ...

If a person has problems with the blue-sensitive cones in their eyes, they will be blue-yellow color-blind, although this form of color blindness is less common than red-green.

If a person has problems with the blue-sensitive cones in their eyes, they will be blue-yellow color-blind, although this form of color blindness is less common than red-green.