Repeatability and Intercorrelations of Standard Vision Tests as a Function of Age
Purpose: We assessed repeatability and intercorrelations of five standard vision tests in subjects with normal vision. Methods: Seventy-eight subjects (aged 21 to 68 years) completed five measurements each of high- and low-contrast visual acuity, near visual acuity and contrast sensitivity (Pelli-Robson chart). Results: Except for correlations between high- and low-contrast visual acuity (r = 0.78), intercorrelations between tests were low to moderate (r < 0.5). For each measure, variability for the group was about one line on the chart (one triplet for the Pelli-Robson chart) and the minimum variability for an individual subject was about one third of this. On average, 1 to 2 lines can be expected to be lost over the normal lifespan on each test. Variability in responses did not increase significantly with age for any test. Conclusions: The criterion for judging change on commonly used clinical vision tests is about one line for subjects over a wide age range.
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|Item Type:||Journal Article|
|Additional Information:||The contents of this journal can be freely accessed online via the journal's web page (see link) 12 months after publication. Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal's website or contact the author. Author contact details: firstname.lastname@example.org|
|Keywords:||visual acuity, high contrast, low contrast, contrast sensitivity, clinical tests, aging, repeatability, logarithm of the minimum angle of resolution (logMAR)|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 2000 Lippincott Williams & Wilkins|
|Deposited On:||01 Dec 2006|
|Last Modified:||15 Jan 2009 17:16|
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