Category Archives: Medical Services

The Different Types Of Colour Blindness

Colour blindness is when an individual loses the ability to see certain to no colours at all. Colour blindness can occur due to genetics, old age or damage to the eyes. There are many people who are colour blind. Due to colour blindness they may be unable to get a driving license. There are three types of colour blindness. Partial colour blindness can be divided into red – green colour blindness and blue – yellow colour blindness. The third type is total colour blindness which is rarer than partial colour blindness.

Red – Green Colour Blindness

Red- green colour blindness affects a significant amount of the total population. Chromosome X is what houses the genes for the red and green colour receptors therefore this affects mostly males as females have two X chromosome and when one X chromosome is defective the other is usually not. Since men have one X and one Y, if the X chromosome is defective they will be red – green colour blind since they only have another y chromosome. There are certain variations of this colour blindness such as Protanopia, Deuteranopia, Protanomaly and Deuteranomaly where the cone cells differ in the fovea.

Blue – Yellow Colour Blindness

The blue – yellow colour blindness does not affect males and females differently like red – green colour blindness. Chromosome 7 is what houses The blue receptor and it is evenly shared between both sexes equally. It is a mutation in the gene that causes this colour blindness. The blue and yellow colour blindness unlike the red and green colour blindness has two variations. They are known as Tritanopia and Tritanomaly. Tritanomaly is very rare. It only affects around 1/100 for male and female equally compared to Tritanopia which affects about close to 1% for both sexes equally. It is best when color blindness is identified at a young age.

For eye test in Sydney you can take steps to help the child. Total Colour BlindnessTotal colour blindness occurs when an individual cannot distinguish any colour at all. This is very rare and only occurs in a few people. Total colour blindness too has two variations. They are known as Cone Monochromacy and Rod Monochromacy In Cone Monochromacy, the individual cannot distinguish individual hues. People who have this kind of colour blindness further suffer from jiggling eyes, light sensitivity and Myopia.

They may require childrens behavioural optometrist to improve their well-being. Rod Monochromacy is when cone cells are not present in the retina at all. They see everything in the shades of grey. It is like watching a black and white movie. It is very rare among the population and severely handicaps the person.

By April 24, 2017.    Medical Services