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Medical Forum / General / Vision / December 2005color blindness
is there a way to correct color blindness? What causes color blindness? Why is it that I confuse only red and green, not other colors? Also, why is there a common belief that color blindness is always seeing in black and white? On 12/3/05 5:43 PM, in article 1133660616.994611.172850@o13g2000cwo.googlegroups.com, "pongo" <redeemedmen@aol.com> wrote: > is there a way to correct color blindness? What causes color blindness? > Why is it that I confuse only red and green, not other colors? Also, > why is there a common belief that color blindness is always seeing in > black and white? This is something you should google or look up in Wikipedia. To summarize, humans have three kinds of color receptors just as Maxwell said. You are missing one of them. It is genetic, and nothing can be done about that. Some color filters may change the way you do discriminate various colors, but I would suspect that filters will not be very helpful. Be thankful that you have two sets of color receptors. There are some people who are missing all three and essentially see in just black and white. Even worse, they have no central vision because they have no cones which contain the color pigments necessary for color vision. Bill -- Ferme le Bush > On 12/3/05 5:43 PM, in article > 1133660616.994611.172850@o13g2000cwo.googlegroups.com, [quoted text clipped - 18 lines] > have no central vision because they have no cones which > contain the color pigments necessary for color vision. I suspect there is more to it than that and more causes than genetic. I used to have no problem with colors. Now I don't do so well in lower light. For example I can't tell if my pants in the closet are navy blue or black in the morning. If I lay them next to each other I can tell them apart if the navy blue isn't really dark. In sunlight or office lighting I can tell. In short, my color sight has degraded from what it was. -Quick On 12/3/05 9:53 PM, in article Nvvkf.26875$q%.12869@newssvr12.news.prodigy.com, "Quick" <quick7135-news@NOSPAMyahoo.com> wrote: > I suspect there is more to it than that and more causes > than genetic. I used to have no problem with colors. Now [quoted text clipped - 4 lines] > lighting I can tell. In short, my color sight has degraded > from what it was. The inability to discriminate between navy blue and black cloth at low light levels is not what color blindness is about. It is the inability to discriminate between two colors far apart on the color triangle such as red and green. In my own situation, I seem to have lost some red receptors in my left eye so that I have trouble seeing red traffic lights. While that is probably irreversible, it is not genetic. True color blindness is genetic and sex linked. Bill -- Ferme le Bush nothing can be done with colorblind for now. I have read research where they can supposedly insert genes to make you grow new cones and youll suddenly see colors you never saw before! Of course anything like that could be decades away. In the meantime, one can learn to differenate colors by contrast, hue and other clues > In my own situation, I seem to have lost some red receptors in my left eye > so that I have trouble seeing red traffic lights. While that is probably > irreversible, it is not genetic. True color blindness is genetic and sex > linked. Decreased red saturation is a symptom of optic nerve disease. I've never heard "lost receptors" as an explanation before. -MT On 12/4/05 6:15 AM, in article 9SCkf.9626$wf.1023@newsread3.news.atl.earthlink.net, "Mike Tyner" <mtyner@mindspring.com> wrote: >> In my own situation, I seem to have lost some red receptors in my left eye >> so that I have trouble seeing red traffic lights. While that is probably [quoted text clipped - 5 lines] > > -MT The cause was central retinal vein occlusion. I guess where the optic nerve ends and the retina begins (distally) is a mater of definition. Bill -- Ferme le Bush do some reading on your own. there is lots of info on this topic. usually color blindnesses are not due to total loss of one of the three pigments-- oftentimes a pigment is genetically mutated to have a different absorption spectrum so it still functions but has an altered physiology. red-green discrimination is the most common type of problem encountered color blindness. because of the unfortunate name used-- i.e. "color blindness", a lay person would take that literally to mean that an affected person is blind regarding all color vision (i.e. sees only black and white). such a condition is extremely rare. |
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