Originally posted by duajia:
I got red/green deficiency too but I can still differentiate red and green quite well, although, that is subjected to factors such as distance and lighting. I will not be able to spot rambutans on a rambutan tree from afar but close up it is alright. Anyway I was graded PES A and was posted to the commandos. Guess they do see the severity of the colour blindness
According to a medic i talked to that time, there are only 3-types of colour blindness, red-green, green-blue and total colour blindness (which is very rare).
Example to define any colour blindness, the no. "18" can only be seen by normal colour vision ppl. However, one who have red-green can only see "13" and green-blue can only identify a "8" whereas a total colour blindness fellow might not see any figure.