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Doctor insights on: Color Blindness Test Online

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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

Dr. David Chandler
78 doctors shared insights

Color Blind (Definition)

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


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Hemochromatosis color blindness DNA testing influence, can you tell me?

Hemochromatosis color blindness DNA testing influence, can you tell me?

What are you asking?: Can you clarify? Genetic testing for DNA isn't subject to much in the way of outside influences. Genetic work on colorblindness is available but we're not sure what to do with the data. The former is life-and-death. The latter is perhaps a target for gene therapy that will give fullcolor vision to those who haven't enjoyed it. ...Read more

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Before the color blindness test, how did doctors determine if people were color blind?

They asked them.: Since the color blindness tests have been around for at least a few hundred years, an ancient physician would just have had to ask. ...Read more

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Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?

Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?

Usually it is fine: You have defects in the central visual portion of your field of view - an area poorly outlined by most field testing devices. Field tests will define major defects which largely will register from the peripheral areas tested. Have you had a field tested in the past? Is there some condition being sought for with a field.? Your ophthalmologist would not order a field if he doubts the result. ...Read more

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Please describe the most accurate and comprehensive color blindness test?

It is: The anomaloscope which is a rarely used research instrument. The farnsworth 100 test is accurate and comprehensive but rarely used because the time it takes to do it and the extreme difficulty of the test. ...Read more

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How can color blindness affect the way an individual looks at a color blind test?

How can  color blindness affect the way an individual looks at a color blind test?

Color confusion: The tests are designed usually with dots of color along the axis which a color deficient person might confuse them. So by lacking the ability to pick out certain colors, the number or figure will not stand out from the background of dots and so will not be recognized. Some tests are sophisticated enough to indicate which type of color blindness is present. ...Read more

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Ophtamo couldn't find anything wrong, went in cause my vision fluctuates and colors change,he did blood sugar test ,even tested for optic neuritis?

2nd opinion: Time to get another opinion. Some symptoms are fleeting and not easily picked up in one visit. Dr. Milne is an excellent ophthalmologist in Silver Springs, MD. ...Read more

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Do blue dye pregnancy test cause false negatives compared to the pink dyed ones?

Do blue dye pregnancy test cause false negatives compared to the pink dyed ones?

Possibly : Any pregnancy test through urine can result in a false positive or negative result. However, the vast majority of the time they are very accurate if done properly. ...Read more

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What does blood ++++ (plus 4) mean in urine dipstick test?

What does blood ++++ (plus 4) mean in urine dipstick test?

Blood...: It means that a significant amount of blood was present in the urine. If you were going through, had recently finished or about to start your period this could be the reason. However, there are other reason like infection, kidney stones, irritation. You would need to follow up with your doctor on the results if having your period was not the reason. ...Read more

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Where can regular consumers (me) can purchase the orasure hiv/hepatitis instant test kits?

Where can regular consumers (me) can purchase the orasure hiv/hepatitis instant test kits?

Pharmacy: Most national chain pharmacies, such as cvs or walgreens, will carry the oraquick. ...Read more

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How does color blindness affect the way an individual looks during a color blind test?

Loss of color vision: In the retina of your eye, there are rods (for seeing in the dark) and cones (for seeing color and fine detail). There are three types of cones, similar to the three primary colors, and the color blindness test checks subtle differences between shades to see if you are missing cones of one of the color types (usually red or green). But usually you are not aware of any problem seeing things. ...Read more

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How accurate are the new clear blue weeks estimator pregnancy tests?

How accurate are the new clear blue weeks estimator pregnancy tests?

Accurate for HCG: Clear plan is a good product for detecting the HCG hormone. These tests do not guarantee anything, however . You need to be seen by a provider and get checked out. ...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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What is the reason that normal vision people cannot see anti-colorblind test plates in the ishihara test.Can it be an advantage for colorblind people?

Colorblind testing: Ishihara testing is done to evaluate for color perception. People with normal color vision should see the numbers or patterns in the test. People with certain types of color deficit will not see them properly. There is a certain "normal or abnormal" binary determination with ishihara testing. There are newer tests which can also be used. ...Read more

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Coq10 can change urine color?

Coq10 can change urine color?

Coq 10: The taking of coq 10 can turn your urine orange. ...Read more

Dr. Damien Luviano
64 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


Dr. Tim Conrad
442 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