 Occurs when there is a problem with the pigments in your eyes, called your cones  The three types of cones are red, green, and blue  If one is missing you will have trouble differentiating colors  The most common type of color blindness is being able to tell the difference between green and red  John Dalton(someone who was color blind himself) was the first one to write about color blindness  Also called Daltonism, after John Dalton

 Not being able to differentiate colors  May see many colors at once, so that you can not tell what color something is  May only be able to see a few shades of color  In rare cases, you can only see black, white and/ or gray

 No known treatment  Some contacts/glasses can help but they don’t show normal colors and can alter objects  Two tests can be performed i. Looking at colored dots to read what is in them ii. Arranging colored chips by how similar the colors are to each other

 Inherited trait i. Your cones in your eyes can be defective from birth ii. Guys are more at risk because the deficiency is encoded on the X chromosome  Can be acquired i. Comes with age ii. Injury to the eye iii. Glaucoma, cataracts, diabetic retinopathy iv. Side effect to medications

 99% of people who are color blind are red-green color blind  0.5% of women are color blind  If a woman is red-green color blind, all her sons will be too, but fathers cannot pass it on to their sons  A survey found that, “What color is this?” is the most annoying question you can ask a person who is color blind  Desiree Mercer is red-green color blind, but Destinee is not

Color Blind Eye Non- Color Blind Eye

 Kennard, Jerry. "Color Blindness." 2 January February facts  Thompson, Gregory E. "WebMD." 20 July Eye Health Center. 18 February  Vorvick, Linda J. "PubMed Health." 1 June A.D.A.M. Medical Encyclopedia. 18 February