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Testing For Color Blindness In Children
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 moreSee 2 more doctor answers
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
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 moreSee 1 more doctor answer
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 moreSee 1 more doctor answer
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
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
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 moreSee 1 more doctor answer
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
Red-green color blindness is caused by an x-linked recessive gene. In a family, the mother is a carrier of this gene while the father does not have the gene. What are the possible effects on their children?
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
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
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 moreSee 2 more doctor answers
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 moreSee 1 more doctor answer
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
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
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