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Doctor insights on: Color Blindedness

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Dr. Damien Luviano
69 doctors shared insights

Blindness (Definition)

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


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Do color blind people lack cones?

Do color blind people lack cones?

No: Color blind people have a set of rhodopsin light receptive pigments that are shifted in spectrum, giving a narrower range of color perception. Except for a few very rare forms, they have a normal cone count and so their acuity is normal. ...Read more

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Whats "impaired" color vision?

Whats "impaired" color vision?

Imperfect perception: Impaired color vision is when a persons color perception is more limited than a "normal". The degree of impairment is related to the degree of inability to distinguish color differences. There are good tests to make this determination. in your ophthalmologist;s office ...Read more

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Can eye color change?

Can eye color change?

Unusual: Eye color change in adults can signal a specific type of glaucoma. But very often, it seems that the eye color lightens, but this is due to haze in the cornea that can come with aging. ...Read more

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What is "impaired color vision"? Something like color blindness?

What is "impaired color vision"? Something like color blindness?

Color perception: Color vision can be altered in the usual way by inherited defects in the color perceptive elements of the retina. But advanced retinal disease like diabetes can impair color recognition; and changes in the color of the lens, and a few odd types of strokes and optic nerve disease all can alter color recognition patterns. Your ophthalmologist can sort this out for you. ...Read more

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Whats ishihara color blindness test?

Whats ishihara color blindness test?

Color plates: The ishihara test plates are a series of dots of various colors with an embedded number or symbol which cannot be easily seen by the color deficient due to color confusion. They are the most commonly available test in ophthalmologists office although others are also available and some are better at separating the forms of color deficiency out. Ishihara is a good screening test. ...Read more

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Does eye color fade?

Does eye color fade?

No: Generally eye color , which is the color of the iris, after two years of age will be constant throughout life. It can fade from some uncommon diseases which can shred or attack the iris, but this is uncommon. Otherwise, what you have at age 19 is yours for life. ...Read more

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When is baby`s skin color eye color hair color all determined?

When is baby`s skin color eye color hair color all determined?

At conception: When the sperm and egg combine their genetic material, the eye and skin color are determined. ...Read more

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Is color blindness common?

Is color blindness common?

Sort of: About 8% of males and 1% of females have some degree of color perception dysfunction. So it is sort of common but not the majority. It is inherited so the family connection is important and can be traced. ...Read more

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Different color eyes genetic?

Different color eyes genetic?

Yes: The color of the iris is a pattern defined by a number of genes and it is the combination of these that leads to the color we see in the iris. The inheritance is not simple however, and prediction of color other than the browns, is tricky and unreliable. ...Read more

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Color blindness, is this normal?

Color blindness, is this normal?

Not quite: It is "normal" for those who have it. For those with actual normal color vision, it would be abnormal to lose it. ...Read more

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How is color blindness inherited?

How is color blindness inherited?

Sex linked: The most common form is carried on the X chromosome and so it manifests more commonly by far in males who lack a corresponding X (as women do ) to compensate (males have a sort Y chromosome). It is therefore passed on to a male child from his mother who carries a defective X (and most likely a normal X matching it so she is not color deficient.). ...Read more

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Someone became blind from cataract, would their eye color change?

Someone became blind from cataract, would their eye color change?

Might turn white: An advanced untreated cataract will eventually turn white in the pupillary space. If still untreated, some will dissolve and lose the white color but more often will rupture and set up a terrific inflammation inside the eye. In this era, cataract removal is so predictable and safe that advanced cataracts should be rare. ...Read more

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How common is light eye color in oriental asians?

How common is light eye color in oriental asians?

Depends: Depends on what you mean by light--if you mean blue or green eyes, never, unless their parents are of different descent. If you mean light brown vs dark brown, i don't think anyone knows. I have light brown eyes but my wife's are almost black. One of my two children has light brown, the other almost black. ...Read more

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What is impaired color vision?

What is impaired color vision?

Color mistakes: Mostly this is an impaired ability to recognize colors across certain color confusion axes. This is usually inherited and there is no treatment. It occurs mostly in males -7%- and also in females -1%-. But there are acquired forms in generalized retinal disease like diabetes or in optic nerve disease. Your ophthalmologist can sort this out. ...Read more

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Effects of being color blind?

Minor: Depending upon the degree of your deficiency, you will be able to function for most activities (for instance traffic lights are a color designed to be seen by the color deficient). Occupations with issues for you: painter, fruit grader, electronic assembly worker, gemology, appraiser, artist. Legal restrictions for police work, pilots, boat captains. ...Read more

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If a color blind person is red-green color blind, can they still see most shades of those colors normally?

If a color blind person is red-green color blind, can they still see most shades of those colors normally?

Altered perception: They will see shades of color in all colored objects but will but see the full range, so colors that might appear bright to you will seem attenuated to the color deficient and some colors will seem what you might term brownish. The mixture seen depends upon the depth of the color blindness in each individual. Because of this most color deficient persons adopt rather bland wardrobes. ...Read more

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What's the difference between poor color vision and born with color blindness?

Degree: Colorblindness is not necessarily all or nothing. There are varying degrees- thats all. ...Read more