What is it to be color blind?

Most color-blind people can't tell the difference between red or green, but they can learn to respond to the way the traffic signal lights up — the red light is generally on top and green is on the bottom. read more

Red-Green Color Blindness. It’s when photopigments in your eyes’ red cones or green cones don’t work properly -- or at all. There are several types: Deuteranomaly: It’s the most common form of color blindness and affects 5% of males, but is rare in females. It happens when the green cone photopigment doesn’t work as it should. read more

Colour (color) blindness (colour vision deficiency, or CVD) affects approximately 1 in 12 men (8%) and 1 in 200 women in the world. In Britain this means that there are approximately 2.7 million colour blind people (about 4.5% of the entire population), most of whom are male. read more