Colour Blindness is a vision defect characterized by the inability or decreased ability to see colour or perceive colour differences. The most common cause of colour blindness is the deficient development of retinal cones. This is usually an inherited disease. Symptoms are the inability to see colours or differentiate between colours. Some people with colour blindness can see only red colour or only blue or only green colour. Complete colour blindness is called Achromatopsia.
HOW IS COLOR BLINDNESS DIAGNOSED?
Ophthalmologists use the Ishihara colour test to diagnose colour blindness. For children who have not yet learnt to read, symbols are used in the Ishihara test. Another test is the Farnsworth-Munsell 100 hue test.
HOW IS COLOR BLINDNESS TREATED?
There is generally no cure for colour blindness. However, the use of contact lenses might somewhat improve ability to differentiate between colours. Many applications on smart devices have been designed to help colour blind people.
DID YOU KNOW?
The different types of colour blindness are Trichromacy, Anomalous Trichromacy, and Dichromacy.