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Heterophoria: a vergence adaptive position.

B Sethi

    Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
    |January 1, 1986
    PubMed
    Summary
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    Phoria, an adapted eye position, decays slower during monocular occlusion (MO) as prism adaptation increases. This decay rate is inversely related to prism adaptation speed, confirming phoria as an adapted vergence system position.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Vision Science

    Background:

    • Prolonged prism wear leads to slower adaptive decay during monocular occlusion (MO) and faster adaptation to new prism disparities.
    • Phoria, the resting position of the eyes, is hypothesized to be an adapted state of the oculomotor system.

    Purpose of the Study:

    • To investigate the adaptive decay of phoria during MO.
    • To determine the relationship between the rate of phoria decay and the rate of prism adaptation.

    Main Methods:

    • Horizontal and vertical phorias were measured during 4 hours of MO.
    • Adaptation rates to various horizontal and vertical prism disparities were monitored.

    Main Results:

    • Phoria demonstrated adaptive decay during MO.

    Related Experiment Videos

  • The rates of prism adaptation were found to be inversely related to the rates of phoria decay during MO.

    • Conclusions:

    • Phoria represents an adapted position of the vergence system.
    • The findings support the concept of phoria as an adaptive state influenced by visual experience.