Colour blindness is one of the commonest disorders that have affected most males in Australia. Colour blindness is defined as the inability of a person to differentiate given colours. Scientifically, this disorder is known to be genetic; nonetheless, the condition may prevail due to eye damages/ injuries that are mainly caused by accidents or exposure to poisonous chemicals.

Thus, it is important for any Australian to conduct a thorough Colour Blind Test in the event that he or she develops difficulties on colour recognition. Colour perception test can be carried out for all age types. The nature of test to be carried out will depend on the severity of the colour blindness condition. The commonest tests used in Australia include: Ishihara test; F-M 100 Hue Test; Colour Arrangement Test; and RGB Anomaloscope test. Of the four tests, the Ishihara test is the commonest one.

The Ishihara Test is defined by a group of coloured plates; the plates are known as Ishihara plates. The plates are incorporated with dotted circles. The dotted circles are in randomized size and colour. The circles are composed of dotted numbers of different colours; the numbers are normally visible to people with normal eyesight. On the other hand, the numbers are invisible to people with impaired vision. Moreover, the dotted numbers are also invisible to people with red-green colour blindness. The full Ishihara test is composed of a maximum of t hirty eight Ishihara plates; however, most tests will show results after a few plates.

The next commonest Colour Blind Test is the colour arrangement test. This test is simple and it can be conducted at home with the help of a person with normal colour recognition abilities. A person with colour blindness will be required to obtain the various types of colours and arrange them correctly. People with colour blindness will arrange the colours incorrectly while people with normal colour recognition abilities will arrange the colours correctly.

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