A colour blind test, unlike other tests, does not require any prior preparation on the patient’s end. The ophthalmologist will administer the test with the help of test cards. The cards contain a circular cluster of multi-coloured dots, at the centre of these dots, are numbers or symbols which are also dots but in a different colour. This is called the Ishihara Test. If you can identify the contrasting colours and tell the doctor the number or symbol you see, you have normal colour vision.

If there is difficulty in being able to see a number or symbol within the multi-coloured dots, you might have colour blindness. Next, the doctor will administer the colour vision test alternating between the two eyes and ask about any perceived difference in colour intensity between the two eyes. Once the colour blind test is over, the doctor may diagnose any difficulty in colour perception as any of the following:

Deuteranopia: Difficulty in identifying between shades of Red from Purple and Green from Purple

Deuteranomaly: Most common type, shades of Green and Yellow appear Red.

Protanopia: Difficulty in identifying between shades of Blue from Green and Red from Green

Tritanopia: Difficulty in identifying between shades of Yellow from Green and Blue from Green

Achromatopsia: Complete colour blindness, vision only in shades of Grey

A colour blind test is, therefore, imperative in helping you determine if you have any lapses in your colour perception abilities. The test is simple and can even be done at home, and one can treat it to some extent with the help of filtered eyeglasses. Titan Eye+ offers a range of eyeglasses that can be customized as per your prescription and design preferences, so head over to your nearest store for great prices and an endless range of trendy eyewear.

What Is A Colour Blind Test? Find Out if You Need One