colour blindness


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col·or blind·ness

(kŏl'ŏr blīnd'nĕs)
Misleading term for anomalous or deficient color vision; complete color blindness is the absence of one of the primary cone pigments of the retina.
See: protanopia, deuteranopia, tritanopia
Synonym(s): colour blindness.

colour blindness

An inaccurate term for a lack of perceptual sensitivity to certain colours. Absolute colour blindness is almost unknown. Most colour perception defects are for red or green or both. About 10% of males have a colour perception defect, but this is rare in females.

colour blindness

a condition in which certain colours cannot be distinguished, due to a lack of one or more colour-absorbing pigments in the CONE CELLS of the retina. Colour blindness can be caused by acquired diseases of the retina but in the vast majority of cases it is inherited. In humans the most common example is red/green colourblindness which is a sex-linked defect caused by a recessive gene and is thus more common in males than females; See SEX LINKAGE.

col·or blind·ness

(kŏl'ŏr blīnd'nĕs)
Misleading term for anomalous or deficient color vision; complete color blindness is the absence of one of the primary cone pigments of the retina.
Synonym(s): colour blindness.
References in periodicals archive ?
Not only colour blindness can be congenital/hereditary, but it can be acquired as due to retinal or due to hereditary condition, colour blindness may occur due to acquired due to retinal disease or toxicity or systemic conditions.
The general causes of colour blindness are well known but the Moorfields study findings need more research to assess whether this revelation about the UAE people is due to genetic or acquired factors (such as excessive exposure to sunlight or Vitamin D deficiency), according to the team.
Colour blindness affects a significant number of people and especially isolated communities with a restricted gene pool.
If there is a history of colour blindness in either parents' family, then it may be useful to make an appointment with your optician.
Ophthalmic molecular geneticist, Prof William Hauswirth, said: "Although colour blindness is only moderately lifealtering, we've shown we can cure a cone disease in a primate, and that it can be done very safely."
The Welsh regiment was my first port of call and Dai Dower, well-known boxer, was in the same intake (sleeping in the bunk above me as I recall) Two weeks later we were in Derring Lines, Brecon, and I had the notorious army colour blindness test - as many know, a circle of different size and colour dots with a number secreted among the dots.
The most common form is red/green colour blindness, which involves the confusion of red and green.
COLOUR BLINDNESS is far more common among men than women.(2) Colour blind men inherit the condition through the maternal line.
University of East Anglia Computer Science researcher Luke Jefferson is developing technology that makes websites more accessible to those with colour blindness.
The research team highlighted that while there are already glasses with colour filters capable of correcting colour blindness, this solution can be expensive and bulky.
Farnsworth D-15 dichotomous test is a colour blindness test, is a quick and convenient test for routine clinical use to differentiate between protan (Figure 4), deutan (Figure 5) and tritan (Figure 6) colour vision deficiencies and calculate an approximate severity of colour blindness.
Seddiqi added that the screenings will help identify various causes of visual impairment and blindness which will include simple refraction, screening for corneal disorder, colour blindness, cataract, glaucoma and screening for diabetic retinopathy or age-related macular degeneration, among others.