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An automated visual acuity testing computer program using the Apple II system.

D S Friendly, I P Weiss

    American Journal of Ophthalmology
    |February 15, 1985
    PubMed
    Summary
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    This study introduces an automated visual acuity test using an E optotype, suitable for children and adults. The computer program demonstrated reliability comparable to traditional letter charts for assessing visual acuity.

    Area of Science:

    • Ophthalmology
    • Computer Science
    • Human Factors

    Background:

    • Traditional visual acuity testing methods can be time-consuming and require specialized equipment.
    • Developing automated and accessible visual acuity testing is crucial for widespread screening and diagnosis.

    Purpose of the Study:

    • To develop and evaluate an automated visual acuity testing program using a computer-generated E optotype.
    • To assess the reliability and comparability of the automated test with standard methods.

    Main Methods:

    • An automated visual acuity testing program was developed using an E optotype with confusion bars on Apple II equipment.
    • The program featured response box and joystick versions, suitable for ages 3.5-4 years and adults.
    • Statistical analysis included t-tests for significance and correlation coefficients for test-retest reliability and method comparison.

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    Main Results:

    • Test-retest correlation coefficients for the automated E optotype were similar to traditional letter charts.
    • Visual acuity measurements from the automated E optotype correlated highly (+0.93) with a Ferris-type letter chart in amblyopic eyes.
    • The automated system demonstrated comparable reliability and validity to established visual acuity testing methods.

    Conclusions:

    • The developed automated visual acuity testing program is a reliable and valid tool for assessing vision in both normal and amblyopic individuals.
    • This computer-based approach offers a potentially more accessible and efficient alternative to conventional visual acuity tests.