Colour blindness

Colour blindness

Last Reviewed : 12/25/2020
Colour  blindness

Color blindness, or color vision deficiency, is the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions. Color blindness affects a significant percentage of the population. There is no actual blindness but there is a deficiency of color vision. The most usual cause is a fault in the development of one or more sets of retinal cones that perceive color in light and transmit that information to the optic nerve. This type of color blindness is usually a sex-linked condition. The genes that produce photopigments are carried on the X chromosome; if some of these genes are missing or damaged, color blindness will be expressed in males with a higher probability than in females because males only have one X chromosome, whereas females have two and a functional gene on only one of the X chromosomes is sufficient to yield the necessary photopigments.

Color blindness can also be produced by physical or chemical damage to the eye, the optic nerve, or parts of the brain. For example, people with achromatopsia suffer from a completely different disorder, but are nevertheless unable to see colors.

Color blindness is usually classified as a mild disability. There are occasional circumstances where it is an advantage: some studies conclude that color blind people are better at penetrating certain color camouflages. Such findings may give an evolutionary reason for the high prevalence of red–green color blindness. There is also a study suggesting that people with some types of color blindness can distinguish colors that people with normal color vision are not able to distinguish.


We researched this topic for you and found the following best online resources. They are categorized into basic, advanced, and research level based on the extent of information you need. You will be taken to the respective websites by pressing on the links below.


Basic information: colour blind awareness color blindness national eye institute color blindness all about vision color blindness kids what it's like to be color blind color m color blindness american academy of ophthalmology what is color blindness? color blindness colour color blindness colour vision deficiency (colour blindness) medicine color blindness psycology today colorblind ideology is a form of racism american association for pediatric ophthalmology and strabismus color blindness color blindness new york times color blindness


Advanced information: cataract surgery info the ishihara color test for color blindness web exhibits what are the different types of colorblindness? color blindness or color vision deficiency web aim
types of color-blindness health line what causes color blindness? waynes world color blindness & baldness in people britannica color blindness molecular expressions ishihara color blindness test ‘the eye of the beholder’— designing for colour-blind users british telecommunications engineering, vol. 17, jan. 1999



Gogri u, al harby s, khandekar r. Visual function of children with visual and other disabilities in oman: a case series. Oman j ophthalmol [serial online] 2015 [cited 2016 may 26];8:97-101. Available from:

Gupta m, gupta bp, chauhan a, bhardwaj a. Ocular morbidity prevalence among school children in shimla, himachal, north india. Indian j ophthalmol [serial online] 2009 [cited 2016 may 26];57:133-8. Available from: concepts of colours in children with congenital blindness by daniela dimitrova-radojichikj special education-professional and scientific issues journal of special education and rehabilitation 2015; 16(1-2): 7-16 doi: 10.1515/jser-2015-0001 the tehran eye study: research design and eye examination protocol by hassan hashemi et al., bmc ophthalmologybmc series ¿ open, inclusive and trusted20033:8 doi: 10.1186/1471-2415-3-8 prajapati p, oza j, prajapati j, kedia g, chudasama rk. Prevalence of ocular morbidity among school adolescents of gandhinagar district, gujarat. Online j health allied scs.2010;9(4):5 panat av and kulkarni da. 2016. Prevalence of red-green color vision deficiency (cvd) among science students: a 10 years' survey. Human biology review, 5 (1), 65-71. international journal of computer science & information technology (ijcsit) vol 5, no 5, october 2013 doi : 10.5121/ijcsit.2013.5502 21 automatic detection of microaneurysms and hemorrhages in color eye fundus images by sérgio bortolin júnior and daniel welfer color blindness and interracial interaction.playing the political correctness game by michael i. Norton volume 17—number 11 color blindness and contrast perception in cuttlefish (sepia officinalis) determined by a visual sensorimotor assay by lydia m. Ma¨thger et al., vision research 46 (2006) 1746–1753 color blindness: forensic perspective by dr. Yogender bansal et al., jiafm, 2005 : 27 (1). Issn 0971-0973


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Presentations/quiz/newspaper articles: color-blindness is counterproductive many sociologists argue that ideologies claiming not to see race risk ignoring discrimination new outlook on colorblindness glasses may permanently cure color blindness by dana dovey on 5/7/15 at 11:41 am the incredible images that show how a colour-blind person sees the world (and why it might explain van gogh's genius)

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