What+causes+this?

What causes colour blindness? Well there are many different varients. Color vision depends on the absorption of light by visual pigments contained within specialized cells in the eye  called photoreceptors. There are two types of photoreceptors: rods and cones. Rods, which provide vision in dim light, dont have any ability to  distinguish between colors. Cones are responsible for color vision. There are three different types of pigment in the normal eye. Color vision occurs  within the visual part of the brain compares electrical signals from the different types of cones. Next Page:  Previous page: Frustrations of the colour blind   Home: ColourBlindness