Symptoms & Colour Blind Test


The most common colour deficiency in colour blindness, is of red-green colour where the individual finds it difficult to distinguish if something is red or green.  Blue-yellow colour deficiency can also occur.  Very rarely, only shades of grey are seen so everything appears essentially black and white. 

If a child shows signs of colour blindness, although it may be incurable, education can be affected if teachers are unaware and have not made special provisions for the child.  An eye care professional must be informed if a child is showing any symptoms of colour deficiency so that an eye test can be performed.

Ishihara Colour Test

Colour vision can be tested using the famous Ishihara eye test plates devised in 1917 by Dr Shinobu Ishihara, a professor at the University of Tokyo.  The Ishihara plates test for red-green colour deficiencies.  An example of the plates can be found below.  Each plate is made up of a number of dots, which appear to be randomly placed in both colour, and size.  If you have normal colour vision, you will be able to see a number within each plate.  If you cannot see a number in all of the plates or you find it difficult to see a number, you may suffer from colour blindness.  There are 38 such plates altogether, but often only 24 are used in diagnosis. 

Which number do you see in the plates below? (answers are at the bottom of the page):

Plate 1

plate1


Plate 2

plate2


Plate 3

plate3


Plate 4

plate4


Plate 5

plate5


Plate 6

plate6


Plate 7

plate7


Plate 8

plate8

Answers

Plate 1 = No.16, Plate 2 = No.2, Plate 3 = No.5, Plate 4 = No.42, Plate 5 = No.7, Plate 6 = No.29, Plate 7 = No.6, Plate 8 = No.57

If you have struggled with any of these Ishihara plates, consult your local optician. For further colour blindness tests, click here.


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