Colorblindness
Color vision deficiency means that your ability to distinguish some colors and shades is less than normal. It occurs when the color-sensitive cone cells in your eyes do not properly pick up or send the proper color signals to your brain. The human eye sees by light stimulating the retina (a neuro-membrane lining the inside back of the eye). The retina is made up of Rods and Cones. The rods, located in the peripheral retina, give us our night vision, but cannot distinguish color. Cones, located in the center of the retina (called the macula), aren’t much good at night but do let us perceive color in the daylight. Although defected color vision may be acquired as a result of another eye disorder, most colorblind cases are hereditary (present at birth).