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Doctor insights on: Testing For Color Blindness In Children

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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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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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What causes blindness in children in africa?

What causes blindness in children in africa?

Vit A deficiency,etc: Children in africa can be blinded by vitamin a deficiency, onchocerciasis, sometimes malaria, trachoma, injuries, congenital defects some of which might be corrected in a first world country like cataracts at birth, glaucoma, uveitis and a host of other conditions. ...Read more

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Who is at risk for color blindness?

Who is at risk for color blindness?

Males: Color blindness is most commonly a genetic condition. It is usually sex linked, and more common in males. Therefore males with a family history of color blindness would be at higher risk. ...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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What are the available genetic testing for detecting the carrier gene for colorblindness?

What are the available genetic testing for detecting the carrier gene for colorblindness?

Research tool: From my reading, it's been available for about a year as part of the reserach project for treating colorblindness with new genes. ...Read more

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How many chromosomes are in the color blindness disorder?

Typically one: The mutations in genes affecting color vision are typically on the x-chromosome, but it has been shown that occasionally other chromosomes may be involved (perhaps as many as 20 different ones). Since males have only one x-chromosome (females two), color deficit is much more common in males (second x-chromosome in the female may be normal, to compensate). ...Read more

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Is genetic testing available in other countries? Can people send samples to developed countries for testing?

Is genetic testing available in other countries?  Can people send samples to developed countries for testing?

Yes: There are many conditions for which genetic testing has become available, many laboratories have ways of receiving samples, but most rely on fed-ex, dsl as carriers. If you have access to this companies getting the sample to the lab should not be a problem. Most genetic testing companies have forms that you can downloadon-line. ...Read more

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Was my infant screened for dechenne muscular dystrophy? Born in NY - does PKU test for this. Does Viacord screen test for DMD/PKU? What is the difference between the two?

Was my infant screened for dechenne muscular dystrophy? Born in NY - does PKU test for this. Does Viacord screen test for DMD/PKU?  What is the difference between the two?

No: Neither test screens for Duchenne muscular dystrophy. Below are links to the disorders covered by Viacord: http://www.viacord.com/Images/HCNB_Panel_LSDs_121311_tcm117-151644.pdf and NYS covers:http://www.wadsworth.org/programs/newborn/screening/screened-disorders. At this point, Duchenne Connect gives information about testing.: https://www.duchenneconnect.org/understanding-genetic-testing.html ...Read more

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Does a genetic test exist for the disease achromatopsia, or colorblindess?

Does a genetic test exist for the disease achromatopsia, or colorblindess?

Yes: Mutations in one of these several genes will cause colorblindness. These are autosomal recessive mutations. The genes are: achm2-alpha subunit of the cone photoreceptor cgmp-gated cation channel, on chromosome 2q11; achm3- cngb3 gene, the beta subunit of the cone cyclic nucleotide-gated cation channel, on chromosome 8q21; achm4- gnat2 gene, Alpha subunit of cone transducing, on chromosome 1p13. ...Read more

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What is the rate of occurence for color blindness in various major racial groups?

What is the rate of occurence for color blindness in various major racial groups?

Color blindness: Most color blindness is congenital and linked to the w chromosome. The rate is aound 7 per cent for boys and less than 1 per cent for girls. I am unaware of any racial differences in this incidence. ...Read more

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When will there be a breakthrough in solving retinitis pigmentosa; is prenatal screening available?

When will there be a breakthrough in solving retinitis pigmentosa; is prenatal screening available?

No: Retinitis pigmentosa (rp) is a defect in the lining tissue under the retina called the retinal pigment epithelium (rpe). . Treatment options are still experimental involving stem cell implantation, or gene therapy but none of these treatments are available yet to the public. There is no prenatal screening available but genetic counselling may help in families with a strong family history. ...Read more

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What are new treatments for visual impairments in children?

What are new treatments for visual impairments in children?

Chiroprctic opthamol: Chiropractic opthamology can help with rehabilitating vision. Also valled " vision therapy". ...Read more

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What happens if a male hemophiliac (xhy) is crossed with a female carrier of both color blindness and hemophilia (xcxh),?

What happens if a male hemophiliac (xhy) is crossed with a female carrier of both color blindness and hemophilia (xcxh),?

Multiple possible: outcomes. They could have a daughter with hemophilia. They could have a son with hemophilia. They could have a daughter who is a carrier for hemophilia. Cannot say about color blindness without knowing about the male. Their sons have at least 50% chance of having colorblindness. ...Read more

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What tests in pregnancy look for disabilities in your child?

What tests in pregnancy look for disabilities in your child?

Disabilities ? : You get the most from this site when you provide the most detail about your concerns. Disabilities include a broad range of issues. More than half of infants who will have cerebral palsy & related impairments are products of normal pregnancies/labor/delivery. No pre-natal testing will identify this child. There are many tests for other issues.You are welcome to start over with why you are asking. ...Read more

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What is the most accurate and comprehensive color blindness test available nowadays?

Anomaloscope: The anomaloscope is the most complete and compreshensive way to test color vision. The farnsworth 100 test is the next in line. ...Read more

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If a color blind person is red-green color blind, can they still see most shades of those colors normally?

If a color blind person is red-green color blind, can they still see most shades of those colors normally?

Altered perception: They will see shades of color in all colored objects but will but see the full range, so colors that might appear bright to you will seem attenuated to the color deficient and some colors will seem what you might term brownish. The mixture seen depends upon the depth of the color blindness in each individual. Because of this most color deficient persons adopt rather bland wardrobes. ...Read more

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Dr. Jay Park Dr. Park
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What causes newborns to be born with parasites in their brain?

Dr. Jay Park Dr. Park
4 doctors agreed:
What causes newborns to be born with parasites in their brain?

Toxoplasmosis: Fetal infection follows when pregnant mother experiences primary infection during her pregnancy. The risk of fetal infection increases steeply with advancing gestational age at the time of maternal infection. Pregnant women should not dispose cat's litter box. ...Read more

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What are some gross motor delays to look for in year one?

What are some gross motor delays to look for in year one?

Not sitting, crawlin: A typically developing 1 yr old can get to sitting and maintain that position while playing, get back down and crawl, pull to stand, perhaps cruise along furniture, may walk with help orwalk independently, sometimes stoop and recover. ...Read more

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Dr. Damien Luviano
70 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
446 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