@kamranPublished May 14, 2019

Color Blindness Types, Causes and Percentage of People Affected

Color blindness affects about 8% of males and 0.5% of female population with Red-Green colorblindnness being the most common form of color blindness.

Normal vision people have three types of cones ( L, M & S ) than enables them to percieve color by sensing long ( Redish ),medium ( greenish ) and  short ( bluish) wavelengths. All colors percieved by human mind are based on the ratio between these wavelengths. 

Colo blind people have one or more of these L, M & S cones absennt or defected so they are unable to see or distinguish between different colors.

This table shows the percentage of color blind people based on the type of color blindness.

Type
CauseAffected %
MalesFemales
Anomalous Trichromacy
6.30.37
ProtonomalyL - Cone defect1.30.02
DeuteranomalyM- Cone defect5.00.35
TritanomalyS - Cone defect0.00010.0001
Dichromacy
2.40.03
ProtanopiaL - Cone absent1.30.02
DeuteranopiaM - Cone Absent1.20.01
TritanopiaS - Cone Absent0.0010.03
Rod Monochromacy No Cones0.000010.00001


Most common type of color blindness is Red Green color blindness caused by L or M cone deficiency  and the least occuring is Rod Monochromacy ( total color blindness ) which is caused by absense of any cones. 


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