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Topic: Color blindness

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In the News (Wed 22 May 19)

  Color Blindness - AllAboutVision.com
Color blindness is not a form of blindness at all, but a deficiency in the way you see color.
Color blindness occurs when certain cells in the retina that normally respond to color do not respond as they should.
Color blindness is caused by a common X-linked recessive gene.
www.allaboutvision.com /conditions/colordeficiency.htm   (614 words)

  Wikinfo | Color blindness
Genetic red-green color blindness affects men much more often than women, because the genes for the red and green color receptors are located on the X chromosome, of which men have only one and women have two.
Color blindness is tested using the Ishihara colour test which consists of a series of pictures of colored spots.
Color codes present particular problems for color blind people as they are often difficult or impossible for color blind people to understand.
www.wikinfo.org /wiki.php?title=Color_blindness   (652 words)

 Color Blindness   (Site not responding. Last check: 2007-10-18)
Color blindness is used in colloquial terms to refer to the difficulty in telling colors apart but a more correct term would be color vision defect.
Color blindness is a misnomer because only a small percentage of people are unable to see any color.
Color vision defects sometimes can be acquired, as a result of eye disease or normal aging or as a side effect of certain medications.
www.uic.edu /com/eye/LearningAboutVision/EyeFacts/ColorBlindness.shtml   (890 words)

 Color blindness   (Site not responding. Last check: 2007-10-18)
Color is also incorporated with flannel boards, colored maps, transparencies, books with colored print, colored counting beads, and green or brown chalkboards (Sewell, 1983).
Testing of color blindness can take place as early as the age of three, and is recommended to parents before the age of seven.
If a child is not identified as color deficient, their career decisions may result in many hours of frustration and it could damage their self-esteem while trying to choose a career.
hubel.sfasu.edu /courseinfo/SL2000/color_blindness.html   (1751 words)

 Color Blindness - Free Color Blindness Test and information on Symptoms, Causes and Treatments
Color Blindness, or Color Vision Deficiency, is an eye condition where a person is not able to distinguish certain colors or shades of colors to some degree.
Color blindness is a hereditary condition but can also be caused by eye diseases, damage to the retina and macula, and aging or when the lens is darkened over time from a cataract.
Color blindness is hereditary and thus it is usually transferred at birth.
www.eyecaresource.com /conditions/color-blindness   (586 words)

 Color blindness - Wikipedia, the free encyclopedia
Color blindness is usually classed as a disability; however, in select situations color blind people may have advantages over people with normal color vision.
The gene for red-green color blindness is transmitted from a color blind male to all his daughters who are heterozygote carriers and are perceptually unaffected.
Color blindness is not the swapping of colors in the observer's eyes.
en.wikipedia.org /wiki/Color_blindness   (2633 words)

 How do things look to colorblind people?
Color blindness is typically a genetic condition, and it is much more common in men than in women.
Also, although not called "color blindness," when people age, their corneas typically turn yellowish, severely hampering their ability to see violet and blue colors.
A mild color deficiency is present when one or more of the three cones light sensitive pigments are not quite right and their peak sensitivity is shifted (anomalous trichromasy - includes protanomaly and deuteranomaly).
webexhibits.org /causesofcolor/2.html   (333 words)

 About Color Blindness - What, why, how - problems
Color blindness (color vision deficiency) is a condition in which certain colors cannot be distinguished, and is most commonly due to an inherited condition.
Color blindness is rooted in the chromosomal differences between males and females.
Color blindness is a malfunction of the retina, which converts light energy into electircal energy that is then transmitted to the brain.
www.toledo-bend.com /colorblind/aboutCB.html   (1945 words)

 color blindness   (Site not responding. Last check: 2007-10-18)
It occurs most often in boys because the genes for red and green color vision are carried on the X chromosome (that is, color blindness is X-linked).
Color vision testing is not routinely done (or necessary) in younger children, but the issue may arise when a young child seems to have difficulty learning colors but seems developmentally normal in other ways.
Total blue blindness is referred to as tritanopia and is exceedingly rare, because it is carried on a non-sex chromosome.
www.drhull.com /EncyMaster/C/color_blindness.html   (229 words)

 Color Blindness | AHealthyMe.com
Color blindness is an abnormal condition characterized by the inability to clearly distinguish different colors of the spectrum.
Most color vision deficient persons compensate well for their abnormality and usually rely on color cues and details that are not consciously evident to persons with typical color vision.
Color blindness that is inherited is present in both eyes and remains constant over an individual's entire life.
www.ahealthyme.com /topic/topic100586636   (1305 words)

 Encyclopedia - Color Blindness
Color blindness — or, to use the formal medical term, color vision deficiency — is any abnormality of the color vision system that causes a person to see colors differently than most people or to have difficulty distinguishing among certain colors.
The overall incidence of color vision deficiency for whites of European origin is 8 percent for males and 1 percent for women.
The exact degree of color vision deficiency can be determined by a test that requires the arrangement of sequences of colored chips or by an instrument called an anomaloscope, which shines a mixture of red and green lights.
www.visionrx.com /library/enc/enc_cblindness.asp   (432 words)

 Accommodating Color Blindness
To understand color blindness better, it is helpful to be familiar with the ways in which colors differ from each other.
Saturation, the second element of the HSB color model, is the "pureness" of the color.
Colors with similar brightness are harder for the color-blind to distinguish.
www.stcsig.org /usability/newsletter/9910-color-blindness.html   (794 words)

 Color Blindness Information on Healthline
Total color blindness- vision only in fl, white, and shades of gray- can be caused by monochromacy (a retina that has only one type of receptor) or from acquired brain damage.
Color blindness can be tested for and diagnosed by a general physician, ophthalmologist, or optometrist.
Color blindness that is hereditary is present in both eyes and remains constant over time.
www.healthline.com /galecontent/color-blindness-3   (1121 words)

 Colorblindness Information Page
Color blindness is a result of a defect in the cone receptors in the retinas of the eyes.
Color blindness is a male dominant trait, but is carried by the female.
Color blindness is the general term used by most people but maybe in this politically correct world we should refer to it as chromatically challenged.
www.dai-sho.com /colorblindness   (1260 words)

 Ishihara books to test for color blindness
Color blindness (color vision deficiency) is a condition in which certain colors cannot be distinguished, and is most commonly due to an inherited condition.
Those who are not color blind seem to have the misconception that color blindness means that a color blind person sees only in fl and white or shades of gray.
It consists of a number of colored plates to provide color blindness test, on each plate is printed a circle made of many different sized dots of slightly different colors, spread in a random manner.
www.kappamedical.com /ishihara_eye_test_charts.htm   (495 words)

 Color blindness test
Color blindness is an inaccurate term for a lack of perceptual sensitivity to certain colors (color deficiency).
Color deficiency is a condition in which certain colors cannot be distinguished, and is most commonly due to an inherited condition.
The most commonly used test to detect color blindness was developed by Shinobu Ishihara (1879-1963), a professor of the University of Tokyo.
www.archimedes-lab.org /colorblindnesstest.html   (382 words)

 Color Blindness
The way we see different colors is something like the way we hear different sounds as being "low" or "high." This is called pitch, and it corresponds to the frequency of the sound.
Color blindness is a genetic condition that only rarely occurs in women, but affects about 1 out of every 10 men to some degree.
The kind of color blindness that is present at birth does not lead to additional vision loss or total blindness.
www.webmd.com /content/article/81/96833.htm   (649 words)

 Firelily Designs - Color Vision, Color Deficiency
The subject of color usage on the web comes up once in a while, so I thought it might be useful to pull together some basic issues for people who might be interested in color.
Color is another perceptual value; there is nothing about light at a wavelength of 700 nanometers that makes it red.
Color on color may seem (relatively) safe if you understand color deficiency, but there is one more catch.
www.firelily.com /opinions/color.html   (3912 words)

 Color Blindness
Color blindness is a condition in which a person has trouble telling the difference between various shades of color.
Color blindness does not mean that a person sees things in fl and white.
Color vision testing is fairly simple, and can be carried out with little difficulty from the age of 3 years (the child doesn't have to know the names of the colors).
www.domianoeyecare.com /health/colorblind.htm   (354 words)

 Prevent Blindness America - Color Blindness
The correct name for color blindness is color vision deficiency.
Color vision deficiency is a term used to describe a number of different problems people have with color vision.
Another cause for color vision deficiency is aging.
www.preventblindness.org /eye_problems/colorvision.html   (301 words)

 Color blindness Encyclopedia of Medicine - Find Articles
Color blindness is the word used to describe mild to severe difficulties with identifying various colors and shades of colors.
Red/green color blindness is the most common deficiency, affecting 8% of Caucasian males and 0.5% of females.
Color blindness that is hereditary is present in both eyes and remains constant through time.
www.findarticles.com /p/articles/mi_g2601/is_0003/ai_2601000336   (897 words)

 color blindness — FactMonster.com
Color blindness is usually an inherited sex-linked characteristic, transmitted through, but recessive in, females.
Color blindness is usually not related to visual acuity; it is significant, therefore, only when persons who suffer from it seek employment in occupations where color recognition is important, such as airline pilots, railroad engineers, and others who must recognize red and green traffic signals.
Tests for color blindness include identifying partially concealed figures or patterns from a mass of colored dots and matching skeins of wool or enameled chips of various colors.
www.factmonster.com /ce6/sci/A0812951.html   (284 words)

 Color blindness - color vision
Color blindness may be a hereditary condition or caused by disease of the optic nerve or retina.
These color problems are linked to the X chromosome and are almost always passed from a mother to her son.
The symptoms of color blindness are dependent on several factors, such as whether the problem is congenital, acquired, partial, or complete.
www.stlukeseye.com /Conditions/ColorBlindness.asp   (469 words)

 Effective Color Contrast - Lighthouse International
Two colors that contrast sharply to someone with normal vision may be far less distinguishable to someone with a visual disorder.
With color deficits, the ability to discriminate colors on the basis of lightness is reduced.
With color deficits, the ability to discriminate colors on the basis of all three attributes -- hue, lightness and saturation -- is reduced.
www.lighthouse.org /color_contrast.htm   (591 words)

 Color Blindness
Color blindness is the difficulty someone has in recognizing or distinguishing one color from another.
Color blindness may be detected during the routine ophthalmologic examination.
Acquired color blindness can occur as a result of ageing or such disorders as retinal optical-nerve conditions, toxic amblyopia, macular disease, cataract, glaucoma, and diabetic retinopathy.
www.innvista.com /health/ailments/eyeail/colorbl.htm   (560 words)

 Color Blindness Check   (Site not responding. Last check: 2007-10-18)
Not until the day I was responsible for an Open Day project on color blindness in my secondary school did I noticed that I am one of the 'victim'.
olor blindness is an inaccurate term for a lack of perceptual sensitivity to certain colors.
Red-green color blindness is a result of a lack of red receptors.
www.geocities.com /Heartland/8833/coloreye.html   (224 words)

 ASP.NET Resources - Color blidness emulator
Color blindness is reduced ability to distinguish between certain colors or wavelengths of light.
Those with this condition are unable to distinguish between colors in the green-yellow-red section of the spectrum.
Those affected are again unable to distinguish between colors in the green-yellow-red section of the spectrum as well.
www.aspnetresources.com /tools/colorblindness.aspx   (206 words)

 Colorblindness explained, with new online tests
For those that are color deficient, this is a graph showing approximate proportions of each type, based on a study of 5000 Swiss men who wanted to be pilots (done by Cameron in 1966).
The genes for color vision are on the X chromosome, and because females have 2 X chromosomes, if one is deficient, the other makes up for it.
With an average of one boy in every classroom having color problems, teachers need to be told, but in 29 years of teaching, I hardly ever had the the school tell me at the beginning of the year who might be color deficient.
members.shaw.ca /hidden-talents/vision/color/colorblind1.html   (703 words)

 Color blindness   (Site not responding. Last check: 2007-10-18)
He thought the aqueosu humor in his eye was colored blue.
Dalton could distinguish 2 main colors in teh spectrum: ROYG was one and BIV the other.
Color vision defects are related to mutations and hybrid genes here: which genes are missing determines protan (red) vs. deutan(green).
www.bios.niu.edu /johns/colorblindness.htm   (710 words)

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