When you can’t see certain colours, or can’t tell the difference between them (usually reds and greens), you may be colourblind. It happens when the colour cells in your eye (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 colourblindness are born with it, but you can get it later in life from certain drugs and diseases.
An optometrist 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 colours.
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