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How good is normal ...
How good is normal visual acuity?. A study of letter acuity thresholds as a function of age.
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- Frisén, Lars, 1939 (author)
- Gothenburg University,Göteborgs universitet,Medicinska institutionen,Department medicine
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Frisén, M (author)
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(creator_code:org_t)
- 1981
- 1981
- English.
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In: Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie. Albrecht von Graefe's archive for clinical and experimental ophthalmology. - 0065-6100. ; 215:3, s. 149-57
- Related links:
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https://gup.ub.gu.se...
Abstract
Subject headings
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- Visual acuity levels were studied in 100 normal subjects of different ages, using a finely graduated letter chart under carefully optimized test conditions. Each line on the chart contained 10 letters of similar difficulty, arranged in random order. A statistical analysis of different response criteria showed a clear superiority of fractional criteria (e.g. 50% correct responses) over the traditional 100% correct requirement. The average difference between right and left eyes was 0.04 +/- 0.15 (decimal notation). Regression analysis of the dependence of visual acuity on age showed a monotonic rise towards the age of 25 years, and a gradual decline thereafter. The most marked decline occurred after the age of 60. Age-dependent confidence intervals were tabulated. The results indicate that minor modifications of the conventional test procedure can enhance the diagnostic potential considerably.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Oftalmologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Ophthalmology (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Neurologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Neurology (hsv//eng)
Keyword
- Adolescent
- Adult
- Aged
- Aging
- Child
- Female
- Humans
- Male
- Middle Aged
- Sensory Thresholds
- Vision Tests
- Visual Acuity
Publication and Content Type
- ref (subject category)
- art (subject category)
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