Eye Exams
Colour Vision TestingThis is done using Ischihara charts. This consists of cards which have colorful small pieces printed on them. A normal person can make out a pattern and read a number in the colour, while a colour-blind person may not detect the number. Some charts operate vise-a-versa. Color Blindness affects 5% of the general population. It is more common in males than in females. Color blind does not mean the person cannot see colors at all. It just means that he cannot distinguish between certain colors, for e.g. red-green blindness, means he cannot make out red from green color. But other colors may be seen perfectly. Color Vision is very important for identifying the signals while driving. Most color blind people cannot make out certain shades of yellow and green, though other colors can be differentiated. Severe color blindness is rare. The color blind can nevertheless drive safely, since the sequence of the colors on the signals is an International standard! For actually checking your color vision: |