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| very simple question about color blindness but cant find any answer. I see greys as greens but not green as grey. green is green. no other colors or black and white are affected. This is not a burden to me I just want to make sure there is no underlying issue. Help please. |
| Answer |
Color blindness is a misleading term used since in reality most \"color-blind\" people have normal visual acuity. I assume your visual acuity is normal and you have no other eye complaints? It has been reported that approximately 8% of men and less than 1% of women interpret colors differently than the rest of the population. Color vision is mediated by the cones of the retina (retinal receptors), and color blindness is classified according to cone function. Cone monochromats are subjects with only one type of cone with an incidence of only about 1:1,000,000, whereas Dichromats are subjects that have 2 rather than 3 types of cones. This group is divided into 3 subgroups being 1. )Protanopes or red-blind subjects who are insensitive to deep red light and 2.) Deuteranopes who can conjuse shades of red, green, and yellow and 3.) Trianopes who are blue-blind and can conjuse blue and green shades. Anomalous trichromats is the largest group of color blind individuals with the same subgroups as described but milder defects. (sounds like you may be in this category).Then there are Rod monochromats which is a very rare disorder where there is a complete lack of cone function and is usually associated with clinical symptoms of photophobia (increased sensitivity to light), poor visual acuity, and nystagmus (an involuntary rapid movement of the eyeball). The common types of color blindness are generally inherited genetically and the acquired causes of color-blindness can occur from retinal disease and poisioning. In acquired cases, the subject may be color-blind in only one are of a visual field (a test of the function of the retina, optic nerve, and optic pathways, testing the peripheral and central fields of vision by focusing on a central point of fixation and testing for vision around that point of fixation). Color vision testing should be done early in life between the ages of 8-12), however doctors are usually wary of putting too much importance to hereditary common milder forms of color-blindness anomalies, which are little more than occassional social inconveniences for subjects. Generally treatment is of no value. If you haven\'t had a general eye examination in a while and especially if this is a recent change in your vision it would be of benefit to visit an ophthalmolgist for a thorugh eye exam. Hope this helps. Good luck. |
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