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Doctor insights on: Color Blindess Test

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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. 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


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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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How is this color vision test taken?

How is this color vision test taken?

Using a color chart: Using a standard color chart with colors easily distinguishable they are pointed to and you are asked to identify the colors. This test is done to identify color blindness which is a hereditary condition. ...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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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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How does color blindness affect the way an individual looks during a color blind test?

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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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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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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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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Are evaporation lines on a EPT pregnancy test blue or gray?

Are evaporation lines on a EPT pregnancy test blue or gray?

I don't know: specifics about the EPT test but the evaporation lines that I have seen were gray. ...Read more

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Could a change in urine color mean overdose on vitamins?

Could a change in urine color mean overdose on vitamins?

NOOOOOOOOOOOOOOOOOO: Not at all. Watery- xs fluids Yellow- concentrated. ...Read more

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How come black eyes don't cause permanent eye color changes?

How come black eyes don't cause permanent eye color changes?

The darkness of : Skin around the eyes that comes from bruising is eventually absorbed back into the body. ...Read more

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What does the green color chips show in urine dipstick for blood?

What does the green color chips show in urine dipstick for blood?

Depends: there are multiple chips that are green depending on what is in the urine. If there is blood in the urine it will turn the yellow chip anywhere from light green to dark green depending on the amount of blood present. The pH chip will also turn green with a higher pH. If protein is present in the urine, the chip will turn a shade of green ...Read more

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If you have red-green color blindness, does red look the same as green?

If you have red-green color blindness, does red look the same as green?

Somewhat: The colors in color deficiencies lose their distinctive character (technically become desaturated) so that distinctions are blurred and many greens and reds in the most common form become poorly distinct. The actual color is not know as this is a psychological phenomenon and the color deficient identify many colors the same that a 'normal' would call distinct. ...Read more

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Does intensity of color of a urin gonorrhea test correlate automaticaly with time that one was infected? Light color=recent, intense color=long time?

Does intensity of color of a urin gonorrhea test correlate automaticaly with time that one was infected? Light color=recent, intense color=long time?

Unreliable test: These tests are not reliable. Whether weakly or strongly positive, speak with your doctor or clinic about more accurate testing, especailly a nucleic acid amplification test (NAAT). If you do have gonorrhea, for sure the color intensity of the test says nothing at all about how long the infection has been present. Onset of symptoms or when you had a high risk exposure are the only ways to know. ...Read more

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OPK test & ferning positive yesterday. OPK test positive, but no ferning today. What does this mean? What is estimated time of ovulation?

OPK test & ferning positive yesterday. OPK test positive, but no ferning today. What does this mean? What is estimated time of ovulation?

Use the OPK: ferning is a very outdated way to assess ovulation, it is really of historical interest only. When the OPK turns positive, intercourse for the next few days is recommended. Good wishes. ...Read more

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How does color deficiency differ from color blindness?

How does color deficiency differ from color blindness?

The same: Color blindness was the original term for conditions in which color recognition was impaired. Since "blindness" is a very charged termed, deficiency has been substituted as the politically correct term since most people with defects in color recognition are not blind at all. ...Read more

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