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Repeatability and intercorrelations of standard vision tests as a function of age.
1Centre for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Australia. j.lovie-kitchin@qut.edu.au
Summary
Standard vision tests show moderate repeatability, with about one line of change expected over a lifetime. Variability is consistent across different ages, establishing a benchmark for clinical assessment.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- Assessing visual function relies on standardized tests.
- Understanding test repeatability is crucial for accurate clinical interpretation.
- Normal vision changes over the lifespan require established benchmarks.
Purpose of the Study:
- To evaluate the repeatability and intercorrelations of five standard vision tests.
- To establish benchmarks for assessing visual changes in normal vision subjects.
- To determine if age impacts the variability of vision test results.
Main Methods:
- Seventy-eight subjects (aged 21-68) underwent five measurements each.
- Tests included high- and low-contrast visual acuity and near visual acuity.
- Contrast sensitivity was measured using the Pelli-Robson chart.
Main Results:
- Intercorrelations between tests were generally low to moderate (r < 0.5), except for high- and low-contrast visual acuity (r = 0.78).
- Group variability was approximately one line (or triplet for Pelli-Robson), with individual minimum variability around one-third of that.
- No significant increase in response variability was observed with increasing age.
Conclusions:
- A change of approximately one line is a suitable criterion for judging clinical vision test changes across a wide age range.
- The study provides a reliable benchmark for tracking visual function changes.
- Findings support the consistent application of these vision tests in clinical settings.