Colour vision deficiency
T ests for colour vision deficiency
Ask for a colour vision test at an opticians if you think you or your child may have a colour vision deficiency particularly if it started suddenly or is getting worse. Colour vision tests don't usually form part of the routine NHS eye test , but you can specifically ask for them. Two of the main tests used to diagnose colour vision deficiency are: the Ishihara test where you're asked to identify numbers contained within images made up of different coloured dots colour arrangement where you're asked toarrange coloured objects in order of their different shades There are a number of online tests usingsimilar techniques that may help detect a possible problem, but it's best to have a proper test at an opticians if you have any concerns about your colour vision.
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Introduction
Find about colour vision deficiency and colour blindness, including how to get tested, why it happens, what problems it may cause and what can be done about it.
Types and symptoms of colour vision deficiency
Most peoplewithcolour vision deficiency have difficulty distinguishing between shades of red, yellow and green. This is known as "red-green" colour vision deficiency.It's a common problem that affect
T ests for colour vision deficiency
Ask for a colour vision test at an opticians if you think you or your child may have a colour vision deficiency particularly if it started suddenly or is getting worse. Colour vision tests don't usua
Issues for people with a colour vision deficiency
Colour vision deficiency isn't usually anything to be concerned about. Most people get used to it over time, it won't normally get any worse and it's rarely a sign of anything serious. However, it ca
Treating and living with a colour vision deficiency
There's currently no cure for inherited colour vision deficiency, although most people are able to adapt to it over time. It may help to: tell your child's school if they have problems with their c
Causes ofcolour vision deficiency
Inthe vast majorityof cases, colour vision deficiency iscaused by a genetic fault passed on to a child by their parents (see below). It occurs because some of thecolour sensitive cells in the eyes, c
How colour vision deficiency is inherited
Thegenetic fault that usually causes colour vision deficiencyis passed on in what's known as an X-linked inheritance pattern . This means: it mainly affects boys, but can affect girls in some cases
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