who discovered color blindness in patients,and what causes color blindness?
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*   Color blindness (color vision deficiency) is a condition in which certain colors cannot be distinguished, and is most commonly due to an inherited condition. Red/Green color blindness is by far the most common form, about 99%, and causes problems in distinguishing reds and greens. Another color deficiency Blue/Yellow also exists, but is rare and there is no commonly available test for it.\n    * Depending on just which figures you believe, color blindness seems to occur in about 8% - 12% of males of European origin and about one-half of 1% of females. I did not find any figures for frequency in other races. Total color blindness (seeing in only shades of gray) is extremely rare.\n    * There is no treatment for color blindness, nor is it usually the cause of any significant disability. However, it can be very frustrating for individuals affected by it. Those who are not color blind seem to have the misconception that color blindness means that a color blind person sees only in black and white or shades of gray. While this sort of condition is possible, it is extremely rare. Being color blind does keep one from performing certain jobs and makes others difficult.\n\n The human eye sees by light stimulating the retina (a neuro-membrane lining the inside back of the eye). The retina is made up of what are called Rods and Cones. The rods, located in the peripheral retina, give us our night vision, but can not distinguish color. Cones, located in the center of the retina (called the macula), are not much good at night but do let us perceive color during daylight. Colour blindness is an inherited disease
219289
Well, rainbows (which are a spectrum) have been known for ages and ages. That crystals will produce rainbows has also been known for ages. Newton was the first person to seriously investigate the properties of light using prisms. The discovery of spectral *lines* was later, but I'm not sure by whom. But it was mostly done by the late 1800's. As a point of interest, Helium was first discovered through the spectrum of sunlight and only later found on earth.
709683
Color blindness is a sex-linked thing (giggles from the 5th grader)\nThe gene is on the X chromosome.  Men get one X and one Y chromosome.  If their X has the gene for color blindness, there is no matching gene on the Y chromosome to "cover" for the defective gene.  The color blindness is expressed.\n\nWomen, however, are blessed with 2 X chromosomes.  If they get a gene for color blindness, the other X usually has a normal gene that can "do the work" that the abnormal gene cannot.  Color blindness is not expressed, and she is a carrier of the gene.\n\nWomen can be color blind if their color blind Dad marries a carrier Mom, and she gets 2 defective genes.\n\nHow's that?
444857
It has been pondered back to ancient times, including ancient greeks who believe vision was actually light emanating from the eyes and hitting objects. The first accurate accounting of light was from Newton who discovered that white light is made up of all the colours.
547187
Color blindness may be partial (affecting only some colors), or complete (affecting all colors).  Complete color blindness is very rare.  Those who are completely color blind often have other serious eye problems as well. Red/Green color blindness is by far the most common form, about 99%, and causes problems in distinguishing reds and greens. Another color deficiency Blue/Yellow also exists, but is rare and there is no commonly available test for it.
788423
No one can know its first occurence. But the microfilaria that causes river blindness was first observed in West Africa in the year 1875 by John O'Neill.
198724
Color Blindness is recessive and only found on the X chromosome.\nMales have XY, females have XX.\nSo, for a person to be color blind, they must have both alleles for color blindness. But, since it is only carried on the X chromosome, if a male's X chromosome has the allele for color blidness on it, he has it, since there is no other allele in the Y chromosome to cancel it out. However, on a female, she can have a color blind allele on one X chromosome and a normal vision allele on the other, which overpowers the recessive color blindness.\n\nIn this problem, for two people (a male and female) to have normal vision, but one of the sons is color blind, that means the father has a normal allele on his X, but the mother has one color blind allele on one of her X chromosomes. Since males only need one allele, this leaves the possibility that the mother gives her color blind allele to one son, but not to the other, with the father giving a Y to both. But for a girl, they would need two color blind alleles. The mother can give one, but the father's X chromosome holds the normal allele. This means every daughter in the family will have normal vision.
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Johann Wolfgang!\n\nHe discovered furfural, worked on the use of platinum as a catalyst, and invented a lighter, known as Döbereiner's Lamp.\n\n:)
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Waldeyer discovered chromosome\nHans krebs propounded kreb's cycle\nAnton van leewenhoek invented simple microscope\nWagner discovered nucleolus\nRobert Brown discovered nucleus\ncell theory propounded by  Schleiden(botanist)&Schwann(zoologist)
239842
yes multiple sclerosis can cause red/green color distortion to arise spontaneously
82598
alfred wegener\njust learned this myself (:
237598
Color blindness is dependent on the visual spectra.  OK..thats lots of jargon so here is simple way to look at it.  You visual light is while however if you put a prism you will see rainbow colors (remeber prism experiemnt?).  Well, your eye is designed to synthesize white visual light into optical shades (rainbow) and hence one can see colors.\n\nNow two ends of this color spectra are Blue and Red and everything in between.Depending upon, where there is a deficiency in your prism (eye), it can vary in color interpreation.  Hence, it varies with ansers below. There have been examples in the history that baristors (lawyers in English court) went to court with Red coat (instead black) and judges thought that person was a prankster...this is before color blindness was identified..
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Yeah.\n\nActually, I think he wasn't born blind. I read somewhere (I don't remember where) that there were some complications right after he came out of the womb and something wrong happened when the doctors tried to fix it. He was given too much oxygen, and that caused him to go blind.\n\nTry searching the net for his biography. I think he has one in Yahoo! Music.
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see: http://en.wikipedia.org/wiki/Color_vision\nhttp://en.wikipedia.org/wiki/Color_blindness
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sorry, I agree that D is correct. (\nhttp://www.abledata.com/abledata_docs/Night_Vision.htm )\n\nAs perception of white (or any gray levels) is the equal stimulation of all three different photopigments/photoreceptors, you can see all grey levels using your cones only. No mystery about it. If you understand additive color mixing you can use Photoshop to prove this on your computer. Or you can use colored transparencies and a projector. Research additive color mixing if you are not familar with it. So you can have no rods (look up night blindness) and still see black (no stimulation) and white (equal stimulation of all three cones) during the day time using your cones only. So the answer is no, you can not be "black, grey, white blind" , but it doesn't have to do anything with the presence or absence of rods in your eyes. \n\nThough there seems to be a really minor effect of rods on the perceived hue, colors could be somewhat less saturated,and it seems to rely on interaction of nerve cells other than the primary photoreceptor cell. Generally Pubmed or Google Scholar should both allow you to search large databases of science publications which haven't made it into textbooks.
237518
It is an ailment that works much the same way as vertigo, (I am not sure that I am spelling that right.)  The disease that Micheal Jackson reports that he has.  The pigment in the skin cells is activated however instead of the other way around.
4502
There is a test where there are a bunch small circles within a larger circle. A number is written in the small circle with a different color. If you can't read the number then you are color blind. It's called the Ishihara test.