Monday, October 31, 2011

color blind .

some peoples were born unlucky with color blind . (ps : my bf is one of them) . color blind is  the inability or decreased ability to see color or perceive color differences, under lighting conditions when color vision is not normally impaired .

there are 3 types of color blind ; protanopia , deuteranopia , and tritanopia .

protanopia.
Lacking the long-wavelength sensitive retinal cones, those with this condition are unable to distinguish between colors in the green–yellow–red section of the spectrum (around 492 nm) . for them the brightness of red, orange, and yellow are much reduced compared to normal .

deuteranopia .
Lacking the medium-wavelength cones, those affected are again unable to distinguish between colors in the green–yellow–red section of the spectrum (498 nm) . The deuteranope suffers the same hue discrimination problems as the protanope, but without the abnormal dimming .  Similarly, violet, lavender, purple, and blue all seem much the same to a deuteranope .

tritanopia .
Lacking the short-wavelength cones, those affected are unable to distinguish colors along the blue–yellow dimension. This form of color blindness is not sex-linked.

color as viewed by NORMAL person
colors as viewed by PROTANOPIA
colors as viewed by DEUTERANOPIA
colors as viewed by TRITANOPIA


source : www.wikipedia.com

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