There are three main types of color vision deficiency: red-green, blue-yellow, and complete. Color blindness, or color vision deficiency, affects the way you perceive color and can make it hard to ...

Summary The three main types of color blindness are red-green, blue-yellow, and monochromatic. Cones are a part of the eye that enables people to see colors.

Kiersten and Julien Saunders, a couple who retired in their 40s, say there are three types of spenders. Fast spenders can't hold onto their cash, while financially insecure people worry about ...