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Phoria measurements using chromatic targets

G Strong, R Pace

    American Journal of Optometry and Physiological Optics
    |June 1, 1982
    PubMed
    Summary
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    Background color affects eye alignment in prepresbyopic individuals. Green backgrounds at near distances shift phoria measurements towards exophoria, unlike red or white backgrounds.

    Area of Science:

    • Ophthalmology
    • Optometry
    • Vision Science

    Background:

    • Prepresbyopia affects visual function and binocular vision.
    • Understanding phoria is crucial for diagnosing and managing binocular vision disorders.
    • Target background color can potentially influence visual measurements.

    Purpose of the Study:

    • To investigate the effect of different target background colors on Von Graefe phoria measurements.
    • To assess potential differences in phoria at near (40 cm) and distance (6 m) viewing conditions.

    Main Methods:

    • Von Graefe phoria measurements were taken from ten prepresbyopic subjects.
    • Testing was conducted at 40 cm and 6 m.
    • Stimuli consisted of a vertical column of black letters on red, green, and white backgrounds.

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    Main Results:

    • At 40 cm, phoria measurements with red and white backgrounds were similar.
    • A green background at 40 cm resulted in a significant shift towards greater exophoria.
    • No significant differences in phoria measurements were observed across background colors at 6 m.

    Conclusions:

    • Target background color can influence near phoria measurements in prepresbyopic individuals.
    • Green backgrounds may induce or exacerbate exophoria at near viewing distances.
    • Distance phoria measurements appear less susceptible to background color variations.