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Topic: Color blindness



  
 Color blindness - Wikipedia, the free encyclopedia
In academic studies of color blindness, on the other hand, there is more interest in developing flexible tests ([1], for example) to collect thorough datasets, identify copunctal points, and measure just noticeable differences.
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.
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.
http://en.wikipedia.org/wiki/Color_blindness   (2509 words)

  
 Discovery Health :: Diseases & Conditions :: color blindness
Discovery Health:: Diseases and Conditions :: color blindness
Less commonly, color blindness occurs as part of aging or is caused by a medication or disease.
Color blindness may also be caused by some medications or by normal aging of the lens of the eye.
http://health.discovery.com/encyclopedias/illnesses.html?chrome=None&article=2367&page=1   (386 words)

  
 Color Blindness AHealthyMe.com
Accidents or strokes that damage the retina or affect particular areas of the brain eye can lead to color blindness.
Some medications such as antibiotics, barbiturates, anti-tuberculosis drugs, high blood pressure medications, and several medications used to treat nervous disorders and psychological problems may cause color blindness.
There is no treatment or cure for color blindness.
http://www.ahealthyme.com/topic/topic100586636   (1305 words)

  
 MSN Encarta - Color Blindness
Color Blindness, defect of vision affecting the ability to distinguish colors, occurring mostly in males.
Color blindness also may occur as a temporary condition following a serious illness.
Dichromatism is the most common form of color blindness, affecting about 7 percent of men and less than 1 percent of women.
http://encarta.msn.com/encnet/refpages/RefArticle.aspx?refid=761555279   (335 words)

  
 Blindness
Chapters include: Vision and Color Perception, What Is Colorblindness, Types of Colorblindness, The Importance of Light, Causes of Acquired Color Vision Confusion, Colorblindness in Females, A Journey Through Color Vision Research, Color Vision Tests, Learning, Memory, and Color Vision Confusion, How Are Families Affected by CVC, Coping With Color Vision Confusion, Conclusion,Bibliography, and Suggested Readings
Dancing in the Dark A Guide to Living With Blindness and Visual Impairment Neer suffered from low vision throughout her life and eventually became blind.
Alexander's story of her adjustment to blindness reads like a gripping suspense novel.
http://www.lowvision.org/blindness.htm   (548 words)

  
 ABC-Dir: Blindness
Professional information on color blindness, related conditions and tests.
Offers products on color blindness diagnosis and educational materials on color blindness.
Provides articles and links to information about the physical, emotional, social, and spiritual impact of blindness.
http://www.abc-directory.com/view/blindness   (217 words)

  
 Color Blindness
I am red-green deficient, the most common form of color blindness, an hereditary condition carried on the "X" chromosome and hence found primarily in males.
Females are typically carriers and it would appear that I received my color blindness through my mother.
These days, my color blindness is merely a nuisance.
http://www.mark.melnick.name/color/color.htm   (700 words)

  
 default.aspx
This condition is associated with color blindness, visual acuity loss, extreme light sensitivity and nystagmus.
Color Blindness - Color Blindness 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
Creamer Color Chart - Screening test for the early detection of red-green colorblindness in children.
http://www.diseasedirectory.net/Eye_Disorders/Color_Blindness/default.aspx   (398 words)

  
 Color blindness - color vision
Color blindness may be a hereditary condition or caused by disease of the optic nerve or retina.
There is no treatment or cure for color blindness.
Color blindness may be partial (affecting only some colors), or complete (affecting all colors).
http://www.stlukeseye.com/Conditions/ColorBlindness.asp   (469 words)

  
 Gale Encyclopedia of Medicine: Color blindness
Some antibiotics, barbiturates, anti-tubercular drugs, high blood pressure medications, and a number of medications used to treat nervous disorders and psychological problems may lead to color blindness.
There is no treatment or cure for color blindness.
Illnesses that can lead to color blindness are: Alzheimer's disease, diabetes, glaucoma, leukemia, liver diseases, chronic alcoholism, macular degeneration, multiple sclerosis, Parkinson's disease, sickle cell anemia, and retinitis pigmentosa.
http://www.findarticles.com/p/articles/mi_g2601/is_0003/ai_2601000336   (933 words)

  
 Color Blindness Check
olor blindness is an inaccurate term for a lack of perceptual sensitivity to certain colors.
nother form of color blindness -- yellow-blue is the second most common form, but it's extremely rare.
Red-green color blindness is a result of a lack of red receptors.
http://www.geocities.com/Heartland/8833/coloreye.html   (224 words)

  
 HyperText Psychology - SENSES/Vision/color
The study of color blindness is a good example of scientific method and the way in which theories are developed and tested.
Briefly, the Herring theory stated above cannot explain two types of color blindness: "protanopia" and "tritanopia", while the theory of Helmholtz cannot explain protanopes and deuteranopes.
Where ability to distinguish a hue is not absent but is weak all current theories fail-- therefore we do not yet fully know how our color sensing mechanism works.
http://sun.science.wayne.edu/~wpoff/cor/sen/viscolor.html   (224 words)

  
 2000-September.txt
With respect to color blindness coming from the mothers side, The gene for color blindness is probably an X linked gene which would make it more prevelent in males.
For example, movement agnosia is the inability to recognize movement and color agnosia is the inability to recognize color.
Then, the next time you see the color, you identify it slightly different; your preception has changed, and therfore, what you "see" has changed.
http://lists.csbs.utah.edu/pipermail/psych3120/2000-September.txt   (224 words)

  
 Night Vision - The Red Myth
The main issue then is intensity; color is only an issue because the rods (responsible for night vision) are most sensitive at a particular color.
Most of what people call night blindness is either a lack of vitamin A in the diet or a failure to understand the night blind spot.
Cataracts, even minor ones, increase the effects of glare at night and the eye's lens does yellow and passes less light as we age which may contribute to what some call night blindness.
http://stlplaces.com/night_vision.html   (2526 words)

  
 New Page 1
Disease progression is rapid leading to a central scotoma, reduced central vision leading to legal blindness and some loss of color vision by the age of 20 years.
In ocular albinism, visual acuity ranges from 20/40 to 20/200 (legal blindness), the eyes may dance (nystagmus) and the person is very sensitive to sunlight.
Optic nerve hypoplasia is one of the leading causes of vision loss and blindness in infants and children.
http://www.ohiolionseyeresearch.com/dictionary.htm   (6158 words)

  
 OptiBoard Discussion Forums - Night Blindness
The only thing I could envision being of any help would be some kind of night scope which intensifies light in a color display.
There are specs out there being touted as useful for "night blindness" but it is counter-intuitive to me to use a spec with a tint--that further cuts the transmission of lite--to help the already low transmission of lite.
I have found success for many of our patients with these lenses but you need to know what you are doing.
http://www.optiboard.com/forums/showthread.php?t=3172   (749 words)

  
 Color variant vision
I hope you found this section if you are interested in "color blindness" or "color defective vision." I hesitate to use this terminology because in some instances it is just plain wrong and in others not quite correct.
The problem is that there is considerable variation among those who test normal for color vision.
Now you may be thinking what is wrong with the term color defective vision?
http://www.yorku.ca/eye/cvv.htm   (749 words)

  
 Color Blindness Check
olor blindness is an inaccurate term for a lack of perceptual sensitivity to certain colors.
nother form of color blindness -- yellow-blue is the second most common form, but it's extremely rare.
Red-green color blindness is a result of a lack of red receptors.
http://www.geocities.com/Heartland/8833/coloreye.html   (749 words)

  
 Night Vision; The Terminal Visual Threshold
Night vision shows several characteristics at variance with those of day vision: (1) Under low levels of illumination, the eye is color blind; rod vision provides no physiologic basis for the discrimination of colors.
However, a sharp distinction must be made between night blindness as indicated by such reported difficulties and nyctalopia, or true night blindness, which may be diagnosed only on the basis of an accurate measurement of retinal sensitivity.
As an example of the serious consequences of failure to use a properly designed instrument and a reliable method of measuring the threshold, the results on one adaptometer may be cited.
http://web.utk.edu/~wverplan/biblio10.html   (3840 words)

  
 Change Blindness
So the phenomenon of change blindness demonstrates a limited capacity short-term memory, not a limited capacity conscious experience.
The only reason the subject did not notice that the parrot changed color was not because he never experienced its color until asked about it, but because he never bothered to remember the color he experienced before it changed to red.
The change blindness task requires comparison of a currently experienced scene with one recalled from short-term memory.
http://cns-alumni.bu.edu/~slehar/changeblind/chbl5.html   (111 words)

  
 Color Blindness
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.
But because the cone cells of the retina are also used to see fine details, people who are colorblind tend to have vision that is less sharp.
http://www.webmd.com/content/article/81/96833.htm   (649 words)

  
 Ishihara Test for Color Blindness
Most of these circles are nothing but spots to me. Below are the correct answers to what a person with normal color vision would see - and what I see (and most people with Red-Green color blindness).
An individual with Red/Green (the most common) color blindness will see a 2 revealed in the dots.
The individual with normal color vision will see a 5 revealed in the dot pattern.
http://www.toledo-bend.com/colorblind/Ishihara.html   (227 words)

  
 Macular Degeneration
(Legal blindness means that a person can see 20/200 or less with eyeglasses.) Even with a loss of central vision, however, color vision and peripheral vision may remain clear.
The "wet" form accounts for ninety percent of all cases of legal blindness in macular degeneration patients.
Macular degeneration is the leading cause of legal blindness in people over age 55.
http://www.nsvc.com/knowledgecenter/maculardegeneration.htm   (1742 words)

  
 Search: Blindness - Info.co.uk
An individual with Red/Green (the most common) color
Blindness is a non-profit national organization that funds research for macular degeneration, retinitis pigmentosa (RP),...
Allows the user to see the world as color blind people see it.
http://dpxml.infospace.com/infocom.uk/results?otmpl=dog/webresults.htm&qkw=Blindness&CMP=KNC-3LS480536328&infoad=1   (320 words)

  
 blindness - Columbia Encyclopedia® article about blindness
About 8% of men and 0.5% of women experience some difficulty in color perception.
Blindness caused by infectious diseases, such as trachoma trachoma (trəkō`mə), infection of the mucous membrane of the eyelids caused by the bacterium Chlamydia trachomatis.
Snow blindness is a temporary condition resulting from a burn of the cornea caused by the reflection of sunlight on snow.
http://columbia.thefreedictionary.com/blindness   (601 words)

  
 blindness. The Columbia Encyclopedia, Sixth Edition. 2001-05
Color blindness, an hereditary problem, is an inability to distinguish colors, most commonly red and green.
Blindness may be caused by injury, by lesions of the brain or optic nerve, by disease of the cornea or retina, by pathological changes originating in systemic disorders (e.g., diabetes) and by cataract, glaucoma, or retinal detachment.
Blindness caused by infectious diseases, such as trachoma, and by dietary deficiencies is common in underdeveloped countries where medical care is inadequate.
http://www.bartleby.com/65/bl/blindnes.html   (313 words)

  
 Online papers 3: Science of Consciousness
Arien Mack and Irvin Rock, Inattentional blindness: An overview (and commentaries by Braun, Dulany, Moore, Most et al, Tzelgov, Humphreys, Noe & O'Regan, Rensink, and reply)
Most, D. Simons, B. Scholl, & C. Chabris, Sustained inattentional blindness: The role of location in the detection of unexpected dynamic events
Cathleen Moore, Inattentional blindness: Perception or memory and what does it matter?
http://consc.net/online3.html#neurovisual   (4590 words)

  
 J.R. Tucker Psychology
Color blindness: some people lack the long (red), medium (green) or short-wavelength (blue) cones.
Color & intensity: We perceive color from reading lengths of different wavelengths (distance of one wave peak to another) of light; we perceive brightness or dimness by the amplitude (height of peak) of the wavelength
What's more, these neurons are in different parts of the brain that all work together (parallel processing) at the same time to help you see what you see in a single moment.
http://myschoolonline.com/page/0,1871,51520-187695-53-43581,00.html   (4590 words)

  
 Which colors do cats see? : Cats
If one only had color receptors, you would see the world as a blur of colors, and some people who are born with grey receptors only (a rare form of color blindness, see the world as we see black and white movies and photos.
Cats appear to see less saturation in colors than humans, meaning cats do not see colors as intensely or vibrantly.
Also complete color vision with grey vision requires a lot of brain that only humans have.
http://www.answerbag.com/q_view.php/5369   (4590 words)

  
 The University of Iowa - College of Education - Employment ePortfolio
Color Blindness in Education: Anti-Discrimination Doctrine or Hegemonic Reproduction of Racial Inequality?
Letters of recommendation regarding my teaching experience are available from the Education Placement Office.
Slideshow on Rethinking the History of Education (07B:210 Education and Social Change)
http://employment.education.uiowa.edu/lalowe/standards.html   (700 words)

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