Color blindness occurs when you are unable to see colors in a normal way. It is also known as color deficiency. Color blindness often happens when someone cannot distinguish between certain colors. This usually happens between greens and reds, and occasionally blues.

types of colour blindness :
congenital
acquired

test for colour blindness

ishihara chart
hardy rand rittler test
holmgren wool test
nagel anamoloscope test
FM 100 hue test
fm 15 hue test
lantern test

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