Color blindness

[Ms. Aziz]

Color blindness or color vision deficiency is the inability or decreased ability to see color, or perceive color differences, under lighting conditions when color vision is not normally impaired. "Color blind" is a term of art; there is no actual blindness but there is a fault in the development of either or both sets of retinal cones that perceive color in light and transmit that information to the optic nerve.
The symptoms of color blindness also can be produced by physical or chemical damage to the eye, optic nerve, or the brain generally. These are not true color blindness; however, but they represent conditions of limited actual blindness. Similarly, a person with achromatopsia, although unable to see colors, is not "color blind" per se but they suffer from a completely different disorder, of which an atypical color deficiency is only one manifestation.

     

     

       

Here is a Test which is called Ishihara Color Blind Test

Normal Color Vision will see                                                     Red-Green Color Blind will see

Left                          Right                                                  Left                       Right
25                            29                                                     25                    Only Spots
45                            56                                                   Only Spots             56
6                               8                                                     Only Spots         Only Spots

[M Z Karim]

Good post.

[hasibur rahaman]

It's a good post. By checking the number on the dots I've found normal eyes.!  ::)

[710000757]

Interesting post....Thanks

[Tanvir Ahmed Chowdhury]

Informative and Interesting Post.................

[sushmita]

Really interesting and useful.