Color Deficiency 14 Plate Book Download |BEST|
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In this study, the authors recommended that all patients with color vision deficiency be tested to determine if they have a color deficiency before undertaking an eyeglass correction procedure that may require an entire change of spectacles.
Based on the above incidence and prevalence data, the authors concluded that the majority of color blind persons would be deuteranomalous. There is no known incidence or prevalence data for deuteranomaly, which is a recessive trait. The authors also concluded that, of the subjects with color blindness, those with color deficiency had higher color vision scores than those without color deficiency.
According to a survey conducted by the National Institutes of Health, approximately 3 million people in the U.S. have color blindness. The authors estimated that 10 million people, or 30% of the population, have some form of color vision deficiency.
Color blindness is more common among males than females. Color blindness is often erroneously attributed to aging. Color blindness is not age-related. Color blindness is not a form of dementia.
Color blindness is due to an inherited disorder in which there is a defect in the color vision system. There are known genes for protanomalous and deuteranomalous color blindness. These genes are all X-linked. Males are typically protanomalous, and females are typically deuteranomalous. The female-to-male ratio for protanomalous color blindness is about 1:3. The frequency of females is 1:500. The female-to-male ratio for deuteranomalous color blindness is about 1:17. The frequency of females is 1:100.
The questionnaire given to 36 color blind subjects shows that the most common complaint is lack of adequate color vision, followed by eye strain. The percent prevalence of color blindness for females was 2.7 times higher than for males.
A score of 8 or more correct plates is interpreted as normal color vision. A score of 12 or less correct plates is interpreted as color vision deficiency, or milder cases may not be identified by this test.
Test - The patient answers the color plates in the first row as quickly as he or she can. No checking of the answers is allowed; the patient gets no time to self-check. The Ishihara plates should be answered first; if there are any reading errors on the demonstration plates, the patient should be allowed more time to answer the Ishihara plates.
The test has shown that the subjects tested have good skills in basic geometry, and can quickly learn new color palettes. This is particularly important if you have a large number of subjects, and don't have time to try and teach them.
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