SB_Intro1_AAV_colourblindness_1104x412_poppy-field-FINAL.jpg SB_Intro1_AAV_colourblindness_1104x412_poppy-field_M.jpg

A deficiency
in colour vision

Colour-blind individuals find it difficult, or impossible, to see certain colours. Some can’t see colour at all, though this is rare.

Why does
it happen?

Colour blindness is often inherited, and present at birth.

Colour blindness could also be a symptom of other eye conditions, such as glaucoma, cataracts or AMD. Diseases like multiple sclerosis and diabetes can also lead to colour deficiency. And changes to the vision that develop with age can affect colour perception.

Daltonismo-a-incapacidade-de-distinguir-cores-CB_AC_Item2_528x241_colourblindness-colourvisiondeficiency-_paint.jpg How to spot it - Sufferers might find it difficult to distinguish between certain colours, for example, reds, oranges, yellows, greens and browns – most commonly, red and green appear the same. Colour-blind people may also struggle to tell the difference between paler and deeper shades.

Daltonismo-e-uma-insuficiencia-visual-CB_AC_Item1_528x241_colourblindness-colourvisiondeficiency-_retina.jpg Treatment - Colour blindness cannot be reversed, but filters on glasses or tinted contact lenses can enhance the ability to distinguish between some colours. Speak to an eye care professional about managing the condition.

  • Teste de cores para daltónicos
  • Daltonismo e teste de cores Ishihara
  • Testes ao Daltonismo

Testing for
colour blindness

The Ishihara colour test will be conducted by your optician and will test for red-green colour deficiencies. The test consists of a number of coloured plates each containing a circle of dots in an apparently random pattern. Within the pattern will be shapes or numbers made by the dots which will be clearly visible to those without colour blindness.

Find an optician

Book an eye test

Eye Care

Before Going To The Optician

  • 1


    Always see a certified and registered optician. 
    Most display their up-to-date registration certificate at their premises.
  • 2


    Let your optician know
    about any concerns.
     It’s their job to look after your optical health, so they’ll be happy to answer all your questions.
  • 3


    First time? Don't worry! 
    Opticians are professionals - and people. They’ll give you all the advice you need.