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Doctor insights on: Lantern Test For Color Blindness

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Taking my child to the optometrist to test for color blindness. How do we prepare?

Taking my child to the optometrist to test for color blindness. How do we prepare?

No need to: It's a simple test where they show the child a book (called an ishihara) with numbers hidden within colored dots. He/she will be asked to identify the numbers and based on that the doc will be able to tell if he/she is color blind. ...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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How are the eye doctors test for color blindness?

How are the eye doctors test for color blindness?

Color charts: Most eye doctors own an ishihara color vision test booklet which can be used to determine if you are color deficient. There are other booklets as well, color caps, and other more sophisticated means to determine the degree and type of color deficiency you might have. ...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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How do you pass a color blindness test?

Color blindness: You either look an images or put a set of colors in order. ...Read more

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How do they test a child for color blindness?

How do they test a child for  color blindness?

Color plates: Your pcp may have a copy of the ishihara plates that are used as a screening test for the various levels of color blindness. I seldom have a request for this screening but find the process helpful. My pcp found a mild issue with my vision with my pre college exam & i keep a copy of the book around to screen kids if asked. If he is old enough to answer questions this can pick it up. ...Read more

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What are the tests involved for color blindness?

Color plates: The most commonly available test is the ishihara color recognition plates which present numbers buried in dots of color over the axis of color confusion for the deficient. This can tell severe from mild color deficiency. Other tests are availbale to tell which type of color deficiency you have. This does have some occupational significance. ...Read more

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Are there any good online color blindness tests?

Are there any good online color blindness tests?

Try this one: http://www.youtube.com/watch?v=cwyrp3hu4ke then go to your eye doctor. Patients can fail this test due to refractive error problems (need glasses), corneal problems, optic nerve problems, and cataracts. ...Read more

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Do you know of tests for being a carrier of color blindness?

Do you know of tests for being a carrier of color blindness?

No: The easiest way is to ask your father. If he is color-blind then you are a carrier. Then ask your mother's father, if he is color-blind, then you have a 50% chance of being a carrier. If neither are color-blind, you cannot be a carrier. ...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

Dr. Lawrence Kale
99 doctors shared insights

Color Blindness (Definition)

Color blindness is a condition where an individual has a decreased ability or complete inability to detect differences between various colors. For example, red-green color blindness is the inability to distinguish between ...Read more


Dr. David Chandler
75 doctors shared insights

Color Blind (Definition)

Color differentiation difficulties are where a person has trouble distinguishing the difference between certain colors. One of the most common difficulties involves difficulty telling apart the ...Read more