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Doctor insights on: Tests For Color Blindness

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What is colour blindness, how do you test for it?

What is colour blindness, how do you test for it?

Color perception: Normal eyes detect a full range of spectrum in the color blind, the spectrum is limited and colors will be confused. It is most commonly inherited and permanent.Testing charts are available in all ophthalmologists office designed to have symbols made with dots that fall on the axis of confusion in a way that the color blind will make the wrong answer and establish the diagnosis. ...Read more

Dr. Damien Luviano
50 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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Can you tell me how colour blindness occurs?

Can you tell me how colour blindness occurs?

Yes: Most cases are caused by a lack of one of three types of cones in the retina, and is a genetic disorder. The most common type is red-green colorblindness and it is x-linked recessive, meaning it occurs in males every other generation. It is carried by females. ...Read more

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What can you do when you have colour blindness?

Adapt: Color blindness of the usual kind (inherited) is not terribly handicapping. You may make unusual color matches in your attire, and certain occupations will be closed to you such as law enforcement, color matching as a painter, fruit grading, etc. But most do well and many do not even know of their deficiency until tested. Advanced retinal disease like in diabetes can also affect color. ...Read more

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Please explain what are some symptoms of colour blindness?

Please explain what are some symptoms of colour blindness?

Color loss: Certain colors such as green and red may be difficult to distinguish while others such as blue and yellow may not. I suggest you read the book by oliver sacks, M.D. Called the "island of the colorblind." his insight is fantastic as both a neurologist and one who had experienced occasional bouts of colorblindness associated with ocular migraines. ...Read more

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Is it possible for colour blindness to be of different intensities?

Yes: You are referring to the depth of loss in color deficiency. Many different patterns are inherited with some being unable to discriminate strong colors from one another and others who can see the strong colors but will have trouble with weaker (desaturated) colors. ...Read more

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Would it be normal for someone with colour blindness to think the wrong colours are right?

Would it be normal for someone with colour blindness to think the wrong colours are right?

Yes: Someone who is colorblind will see colors differently than everyone else. There are certain colors they cannot distinguish. In the most common kind, red-green colorblindness, greens and browns seem identical, for example. ...Read more

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Is it colour blindness when you can't tell whither or not a colour is darker than another or if you have a problem with colour hues?

It is: People who are color-blind cannot tell the difference between certain colors. For example, in red-green color blindness, greens and browns look the same. ...Read more

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Why natural selection hasn't eliminated colour blindness.?

Not needed: Normal color vision is not necessary for reproduction or survival. If we lived in a society where your necktie had to match your shirt in order to allow you to have children, then ultimately color blindness would be eliminated. However, we do not. ...Read more

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Can there be such a thing as orange-green colour blindness?

Can there be such a thing as orange-green colour blindness?

Testing: The most common type of "color blindness" is red-green color deficiency. Blue-yellow deficiency or true color blindness (achromatopsia) are rare. Color testing can identify which. The problem is a lack of certain types of cones or their opsins (light-sensitive compounds). Red-green deficiency can be adapted to fairly easily and is not very limiting, but the others can significantly impact vision. ...Read more

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Is colour blindness genetic? And is there really a cure?

Is colour blindness genetic? And is there really a cure?

Yes: Yes, color blindness is genetic. There are different types. Red-green is the most common. No actual treatment. Orange is added to red, and blue is added to green in order to make them easier for the color blind person to see. ...Read more

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Dr. Tim Conrad
616 doctors shared insights

Vision Loss (Definition)

Vision loss is where a person becomes unable to see to the extent that they were previously able. This can include a total loss of vision, a loss of visual acuity, or a loss of part ...Read more


Dr. Tim Conrad
425 doctors shared insights

Loss Of Vision (Definition)

Loss of vision is a symptom in which a person loses some or all ability to see, either in one or both eyes. Loss of vision can be temporary or permanent, and ...Read more