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How To Detect Color Blindness In Children
4 or 5 years old: Or as soon as the child can recognize colors. ...Read more
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
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
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
Many or none: Everyone is different. I've had pts with very poor vision who says they have no symptoms. Then there are people who have 20/20 vision with symptoms usually the first symptoms are trouble with small prints and glare at night. Next complaint is they can't see the scores or words on tv, followed by not being able to read or see the signs very well when driving or see the numbers on the bus. ...Read moreSee 2 more doctor answers
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
Normally: This is the fortunately typical case. The eye takes in the visual input, converts it to an electrical signal which goes to the brain for interpretation and the picture of the world is generated in your consciousness. If the color vision is normal, than the image is fully color. ...Read more
Blindness: A person without cones would be blind. ...Read more
Probably not: If you are strongly color deficient ( such as deuteranopia) you cannot pass the Ishihara test. If you have weaker deficiency such as deuteranomaly, you will see the richer color plates but may miss some of the subtle plates. If you have color deficiency , and want to enter an occupation requiring color normality, you should respect that standard as someone thought it meaningful. ...Read moreSee 2 more doctor answers
DNA: For the most part, eye color is determined by genetics. There are very rare conditions and some glaucoma eye drop medications that can change iris color, but yellow is most likely a genetic variant where there are a mix of dark and light genes in combination. ...Read moreSee 1 more doctor answer
Dear doctors, what will happen to our eyes,when we forcibly stare at a bright source of light? Does it cause any damage to the eye?
Usually nothing: Most light sources (except the sun and lasers) are not sufficiently intense to do any damage. You of course will find staring at bright light to be uncomfortable, but your pupils will get automatically smaller and the retina involuntarily moves in little rapid motions which minimize the intensity for any one point. ...Read more
Blindness in preemie: Retinopathy of prematurity (rop) is a disease that affects immature blood vessels in the eyes of preterm babies. It can be mild with no visual defects, or it may become aggressive and progress to retinal detachment and blindness. As smaller and younger babies are surviving, the incidence of rop has increased. The incidence is inversely proportional to the gestational age of the infant. ...Read more
If you have red-green color blindness, what colors in everyday life are difficult to distinguish?
Varies: In red-green color deficiency there is a shift in the perceived spectrum of colors and some reds and greens appear the same while others can be distinguished. A more common form which is a deficiency instead of absolute blindness causes a saturation shift in perception of colors but a full palette of colors is possible with mistakes made in some recognition. ...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
Sensory Rooms: A sensory room is a place where children use multi-sensory experiences to explore, to calm themselves, and to practice important social skills. There are many types of sensory rooms. Some multi-sensory rooms have bright lights, loud sounds, popping colors and fragrances. These rooms are designed to encourage language skills and emotions. Other rooms offer a calming environment." ...Read more
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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