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Subjective and objective visual acuity testing techniques

S G Khan, K F Chen, M Frenkel

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |December 1, 1976
    PubMed
    Summary
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    Objective visual acuity testing using the Catford apparatus showed varying results. While normal vision correlated with optokinetic response, poor vision did not, suggesting limited clinical use for this objective method.

    Area of Science:

    • Ophthalmology
    • Optometry
    • Vision Science

    Background:

    • Objective visual acuity assessment is crucial for clinical diagnosis.
    • The Catford apparatus is an established method for objective visual acuity testing.
    • Previous studies have indicated varying reliability of objective methods.

    Purpose of the Study:

    • To evaluate the efficacy of the Catford apparatus for objective visual acuity determination.
    • To assess the correlation between optokinetic response and visual acuity in normal and abnormal eyes.
    • To determine the clinical utility of the Catford apparatus in diverse patient populations.

    Main Methods:

    • The Catford apparatus was utilized to test visual acuity in 20 normal and 40 abnormal eyes.
    • Neutral-density filters and convex lenses were used to simulate reduced vision in normal subjects.

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  • Optokinetic response was measured and compared against visual acuity outcomes.

    • Main Results:

    • A good correlation was observed between optokinetic response and visual acuity in eyes with normal or near-normal vision.
    • No significant correlation was found between optokinetic response and visual acuity in eyes with poor vision.
    • Findings differed from previous reports by Catford.

    Conclusions:

    • Objective visual acuity testing via the Catford apparatus demonstrates limited utility for general clinical purposes.
    • The nystagmoid response method shows poor reliability in eyes with significantly reduced vision.
    • Further research may be needed to refine objective visual acuity assessment tools.