Doctor insights on:
Physical Characteristics Of Color Blindness
About 8%: The standard statistics for inherited color deficiency is about 7.5% in males and 1/2 % in females. This can vary somewhat with different racial groups. The degree of color deficiency and the type are variable so your ophthalmologist can test you and see in which category you are if that is important to you and also give you information about your family possibilities.See 1 more doctor answer
Ophthalmologist prefer to use the term color deficit as blindness conveys other meanings. Lowered color perception can be inherited (many forms), can result from advanced loss of retinal cells, inherited retinal disease, and some forms occur due to CNS injury. There are excellent tests for the various types and they can be functionally ...Read more
Testing device: These are a group of color vision recognition and confusion plates, discs and lights to determine the degree and type of color deficiency that is present in a test subject. Some are standard in ophthalmologists office and others are in laboratories. And some are available on line for anyone to test themselves.See 1 more doctor answer
Mostly inherited: The most common forms of color blindness are inherited. They are that way from birth. Less common is developmental such as advanced diabetic retinal disease which fades out color recognition. Retinal degeneration like retinitis pigmentosa lead to color blindness and there is a rare form of stroke which can cause cortical color blindness.See 1 more doctor answer
No cure: Most color blindness comes from a genetic alteration in your light receptive pigments in the retina. This cannot be altered by current knowledge and technology. If you are 45 years, you probably will have adapted by now and chosen an occupation in which color recognition is not critical.See 1 more doctor answer
Are you female?: Color deficiency is most common in males as it is carried on the X chromosome. Your brother has an equal chance of getting one or the other X from your Mom and one of these had the deficient gene. If you are male, then you got the other one. If you are female then you might have one deficient X gene but your other, from your father, is normal.
Almost anything: Being colorblind should not limit a person much in life - even some famous artists have been colorblind! The only restriction I can think of is that colorblind people are not allowed to get a commercial driver's license, so cannot become a professional trucker, but otherwise colorblind people can usually learn to recognize traffic light signals and drive a car without difficulty.See 1 more doctor answer
If color normal: The tests are designed with little dots that are shaded along the axes of confusion for the color deficient. A color normal will see the indicated symbol or number while the deficient will miss it.
Not too bad: Many color deficient persons never know about it. There are a few occupational limitations such as paint matching, artistry, printing, and fruit and vegetable grading to name a few. Some occupations such as certain police jobs, pilots and commercial ship skippers require color normality. Most occupations do not require this and color deficiency is not a handicap.See 2 more doctor answers
Psychometric testing: Psychologists have devised testing using an animal preference choice to determine which colors they can discrimminate. They can also observe the colored light absorption by individual photoreceptors with highly sophisticated laboratory apparatus. So we now have a good idea of the color perception (or lack of perception) of most major animal groups.
Apparently normal: The color blind see well and though they might make mistakes in color recognition that a color normal would not, they see everything out there as normal to them and few have any difficulty.
Color perception low: Ophthalmologist prefer to use the term color deficit as blindness conveys other meanings. Lowered color perception can be inherited (many forms), can result from advanced loss of retinal cells, inherited retinal disease, and some forms occur due to CNS injury. There are excellent tests for the various types and they can be functionally significant and affect employment.
Testing: You can compare your color perception with someone known to be color normal. An ophthalmologist has available color perception test booklets to determine whether it is present, and what spectrum the deficiency lies within. This is important for certain occupations.See 1 more doctor answer
It's in the genes: Color blindness is a genetic mutation that causes the receptors in the film layer of the eye (retina) to be unable to differentiate certain colors (blue, green etc.). There are several different forms of color blindness, related to the different mutations that can arise. Since most of us do not get the mutation, we have "normal" color perception.See 2 more doctor answers
No: Color deficiency is an internal perception of the person with the problem. The external appearance of the face and eyes will not clue you to that deficiency.See 1 more doctor answer
Yes: There is no driver's licensing testing or criteria that includes testing for color recognition. This includes commercial driver's licenses as well. Traffic lights are set with a spectrum that the color deficient will not make a mistake. So ---- the color blind can drive.See 1 more doctor answer
You cannot: By definition a person with color deficiency lacks some degree of photoreceptive color recognition capacity. The problem is that he will see dissimilar colors as the same. If you identify a specific color as red, he will call it red but will also call a green on the spectrum of his color confusion the same thing.
Not a problem: Color recognition is not a job requirement for this job. If your goal is to be an aircraft refueler, and you happen to be color deficient, this is not barrier. Go for it!See 2 more doctor answers
Color blindness: Color blindness is a congenital or acquired condition whereby a person cannot see certain colors well because the parts of the eye that receive those wavelengths of light do not function well. For example, some people are born with red=green color blindness. They cannot see the color red or green well. Those colors would look gray or "washed out". Special tests can determine color blindness.See 1 more doctor answer
Vision impairment and blindness are conditions in which a person cannot see well or see at all, even with glasses or contact lenses. If a person's best vision (with correction) out of either eye is only 20/70 - 20/200, he is impaired. If he can see no better than 20/200 or his visual field is no more than 20 degrees (severe "tunnel" vision), ...Read more
Loss of vision reflects the inability to perceive images. Such a phenotype can be due to occlusive or barriers to light (e.g. cataracts) through retinal alterations (e.g. wet macular degeneration) to optic nerve lesions (e.g. from a pituitary adenoma) to central nervous system ...Read more