Question

Which of the following statement about colour blindness is correct?

• A. 2% men are red colour blind, 6% are green colour blind
• B. 6% men are red colour blind, 2% are green colour blind
• C. 10% men are red colour blind, 5% are green colour blind
• D. 5% men are red colour blind, 10% are green colour blind

Answer 1

The correct option is A 2% men are red colour blind, 6% are green colour blind

Colour blindness is a disorder wherein the person is unable to distinguish between red and green colour. There four types of red-green colour blindness:

• Protanomaly is the condition in which the red cone photopigments are abnormal wherein red, orange and yellow appear greener and less bright.
• Protanopia is the condition in which red cone cells are dysfunctional wherein red appears black and orange, yellow and green appear as yellow.
• Deuteranomaly is the condition in which green cone photopigments are abnormal. Here yellow and green colours appear red.
• Deuteranopia is the condition in which green cone cells are non-functional. Here red colour appears as brownish yellow and green as beige. It is observed that cases of deuteranomaly and deuteranopia are higher compared to protanomaly and protanopia. It estimated that 2% men are red colour blind, 6% are green colour blind.