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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
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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
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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
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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
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Color
Blind
Eye
NonColor
Blind
Eye
Kennard, Jerry. "Color Blindness." 2 January 2007. 18
February 201
https://sites.google.com/site/colorblindness3042010/funfacts
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Thompson, Gregory E. "WebMD." 20 July 2011. Eye Health
Center . 18 February 2013.
http://www.webmd.com/eye-health/eye
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Vorvick, Linda J. "PubMed Health." 1 June 2011. A.D.A.M.
Medical Encyclopedia . 18 February 2013.
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001997/
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