How to find if you are colour blind? Here are some tests that help in identifying this visual disorder.
Do you think that you cannot visualise colours properly or have trouble in distinguishing the shades? Chances are that you are colour blind. This is a visual disorder that affects colour cones of your eye and makes it difficult for you to perceive some colours. Surprisingly, most colour blind people do not know that they have this problem. This is because they can easily differentiate major colours but confuse shades that are similar for example- blue and sea green, yellow and orange, etc. It is easy to identify colour blindness with simple tests either done at home or by the ophthalmologist.
About 8% of men and 0.5% of women in the world have colour blindness. This condition arises when there is a defect in the light receptors and cones inside a person’s eyes. The defect ranges from mild(where one only color cones is missing) to severe(multiple missing cones). This is a genetic condition and if you have family members or relatives with colour blindness, your chances of being colour blind increase. If you are doubtful whether you are colour blind, visit an eye specialist and get yourself tested.
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Tests for Colour Blindness
There are different types of tests for colour blindness.
Ishihara Colour Test
This is the common test that is aimed at finding red and green colour blindness. You can do this at home also. In this test, you are required to look at a series of plates or circles which has multicolour dots of various sizes. Some dots of the same colour form shape of digits. If you are colour blind, you won’t be able to read the digits. People with normal eyesight can easily spot the digits.
Cambridge Colour Test
This is quite similar to the Ishihara Test where you have to spot the ‘C’ shape in the circle of dots. It is conducted on a computer. You are required to look at the screen and press keys when a ‘C’ shape pops up.
This test is conducted by a doctor to examine red and green colour blindness. In this test, the person is required to see a circle through an eyepiece where the first half of the circle is yellow and the second half is red and green. You’ll be asked to turn knobs until the circle is of the same colour.
Farnsworth-Munsell 100 Hue Test
This test is not done for colour blindness though, it tests the ability of the person to identify differences in shades of same colour. This test is generally done by garment and paint companies who want their workers to be able to differentiate the shades. You’d be given blocks of different hues of one colour and asked to pick blocks of one shade.
Farnsworth Lantern Test
This is not a regular test as this is conducted by the military forces to identify colour blindness in the recruits. Mild colour blindness is okay as nobody can get a 100% vision. To correct the disorder in severe colour blindness cases, you can wear glasses if your doctor recommends.
Hence, if you are feeling the discomfort and want to know the reason behind the difficulty in analysing colours, these tests can be done at the comfort of your home. For further diagnosis, one should consult an ophthalmologist for further diagnosis.
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