Colour vision deficiency means seeing some colours differently or having difficulty telling them apart.
Colour vision deficiency is sometimes called colour blindness, although many people can still see colours and mainly have difficulty separating particular ones. It describes altered colour perception rather than complete loss of sight.
Some forms are inherited, while others develop later. A new or changing problem with colour vision can have a different cause from a lifelong pattern and should be assessed by an eye-care professional. The term alone does not identify the cause.

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