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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
61 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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Colour blindness: what is its treatment and its effect on a person's career?

No treatment: You were born with this condition, like millions of other people. There are some things that you might be limited from doing-- like being a pilot. But in general this should not affect your life in any way. ...Read more

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Can you tell me how are individual human characteristics eg. colour blindness a product of our genetic makeup?

Can you tell me how are individual human characteristics eg. colour blindness a product of our genetic makeup?

Genetics-Epigenetics: We have 46 chromosomes. These contain our genetic make-up-The 46 chromosomes are identical in all 50 Trillion cells.We got 23 from mom and 23 from dad-These 46 chromosomes have 30,000 genes-These genes make up the DNA that instructs each/every cell on what to do, what to specialize in, and when to do it (when to turn on and when to turn off and when to die)-Color blindness (or eye color)is fixed ...Read more

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I have color blind and wearing spexes also, will i pass the medical test..No blood desease?

I have color blind and wearing spexes also, will i pass the medical test..No blood desease?

Depends: There is no relationship between ordinary color deficiency and acuity or the need for spectacles. Color blindness is not tested for instance on obtaining a driver's license. Some occupations do require this testing and if you are color deficient, you likely will fail that. There is no correlation with blood diseases or other systemic diseases. Most medical tests are not color dependent. ...Read more

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What tests would the doctor order to detect premie blindness?

Visual EPs: One can place eeg type leads over back of head and flash led light, recording whether or not the visual cortex of brain receives any signal from flash light stimulus... ...Read more

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How is it that children could not take colour blind tests?

How is it that children could not take colour blind tests?

Who said so ?: Children under school age do not all have the level of understanding to do the standard ishihara plates to screen for color deficiencies.Those that are older do. It is available (i can do it ) but seldom requested. I don't believe i've had more than 1 or 2 requests in 3 decades. ...Read more

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What is a color blind test?

What is a color blind test?

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. ...Read more

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Could you see the 2 in this color blind test?

Could you see the 2 in this color blind test?

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. ...Read more

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Could a retina detachment test make me blind ?

Could a retina detachment test make me blind ?

No: The dilated eye exam is necessary to detect retinal detachments. It is uncomfortable due to bright lights needed for the doctor to exam the retina properly. The bright lights will temporally cause you to see funny colors. ...Read more

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What's a good test to determine the level one is color blind?

Color plates: Standardized testing of color vision can be performed by your eye doctor using specific color plates. Blue-green blindness is very common and usually easy to over come. Many people lead normal lives and never realize that they are color blind. Specific forms may cause more problems. A thorough evaluation by your eye doctor can determine the specific type and offer suggestions about management. ...Read more

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Dr. Tim Conrad
439 doctors shared insights

Loss Of Vision (Definition)

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


Dr. Tim Conrad
632 doctors shared insights

Vision Loss (Definition)

Vision loss = ...Read more