Colorblindness
A reduced ability to distinguish between certain colours.
The condition is often inherited. Other causes include certain eye diseases and medication. More men than women are affected.
When you can’t see certain colors, or can’t tell the difference between them (usually reds and greens), you may be colorblind. It happens when the color cells in your eye (the doctor will call them cone cells) are absent or don’t work.
When it’s most severe, you can only see in shades of gray, but this is rare. Most people who have it are born with it, but you can get it later in life from certain drugs and diseases. Your doctor can tell you what’s to blame. Men are much more likely to be born with it than women.
Your eye doctor can diagnose it with a simple test. There’s no treatment if you’re born with it, but special contacts and glasses can help some people tell the difference between certain colors.