COLORBLINDNESSis all about

See what

By Ralph Cotran

Normal Color Vision

This bouquetappears here as it

appears to aperson with a

normal range ofcolor vision.

The next fewslides will give a

side-by-sidecomparison of thispicture and how it

would appear topeople with

various types ofcolorblindness.

Red-Blind/ProtanopiaThis form of color-blindness results from aninsensitivity to the color red, which leads toconfusion differentiating between blue and

green and between red and green.

Green-Blind/DeuteranopiaThis form of color-blindness is a result of

insensitivity to the color green, primarily causingdifficulty differentiating red and green, but canalso cause difficulty for some gray, purple and

greenish-blue colors as well.

Blue-Blind/TritanopiaThis rare form of color-blindness results from an

insensitivity to the color blue and causesconfusion differentiating between blue and green

as well as yellow and violet.

Red-Weak/ProtanomalyThis form of color-blindness causes the viewer to experience redness

more weakly (in saturation and brightness) than someone with normalcolor vision. The colors red, orange, yellow, and yellow-green are all paler

and shifted more towards green on the spectrum

Green-Weak/DeuteranomalyThis form of color-blindness renders the viewer to see the color green

weaker in brightness and saturation than someone with normal vision. Itcauses slight difficulty differentiating between similar hues for red, orange,

yellow, and green.

Blue-Weak/TritanomalyThis form of color-blindness is extremely rare, and like tritanopia, deals with the bluecone cells. These cones have limited functionality, causing blue to appear greener and

difficulty differentiating yellow and red from pink.

Rod Monochromacy/AchromatopsiaThis rare form of color-blindness is also the most severe. It's present frombirth, with none of the cones in the eye having functional photopigments.This means that the viewer sees the world in greyscale, only registering

black, white, and grey, and also have difficulty in very brightenvironments.

Blue Cone MonochromacyCone monochromacy means that this color-blindness is a result of two of

the three cones in the eye not functioning. Viewers will have difficultydistinguishing between colors because no other cones are present to send

comparative signals to the brain. Viewers can also suffer from near-sightedness and uncontrollable eye movements.

Ralph Cotran is a co-founder andco-owner at US Optical, the third

largest independent wholesaleoptical lab in the United States.

Click here to check out hiswebsite, or visit him on social

media.