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Optom Vis Sci. 2000 Aug;77(8):412-20.

Repeatability and intercorrelations of standard vision tests as a function of age.

Author information

1
Centre for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Australia. j.lovie-kitchin@qut.edu.au

Abstract

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.

[Indexed for MEDLINE]

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