Colour blindness is an eye condition that is referred to as the inability to perceive certain colours. Most people who are colour-blind have inherited the condition from their parents.

Those who acquire colour blindness obtain it due to certain diseases and eye related infections such as glaucoma, macular degeneration, cataract, eye injuries and diabetic retinopathy. Colour blindness occurs when one of the cone cells at the macula fails to function. Due to its development a person is unable to perceive colours such as green, red, blue or yellow. Eye doctors prescribe corrective lenses in order to manage it since there is no proper treatment.

Test for color blindness is important since most Australian institutions require their employees to take it. Professions that require this test are such as the police department and airway lines for the pilots. There exists several colour blindness tests that people can engage to test whether they are colour-blind or not. Ishihara plates colour blindness test is the most commonly used test. It involves coloured circles that show a number and only individuals who are not colour blind can see it. This type of test can only let you know the type of colour blindness you have but not its severity.

The Farnsworth dichotomous key is a test for colour blindness that is also referred to as the Farnsworth D-15 test. It involves twenty two mixed coloured plates that are in four batches and an individual is required to arrange the rows in a correct order. Individuals get to know the type of colour blindness they have depending on where their biggest error is. Individuals who make lots of misplacements are said to have a severe condition.

Test for color blindness may also involve the following: the colour arrangement test and the RGB anomaloscope. Individuals can also find many colour blind tests online.