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Ophthalmic prisms. Deviant behavior at near.

J T Thompson, D L Guyton

    Ophthalmology
    |May 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Accurate strabismus deviation measurement is crucial for successful surgery. Holding prisms further from the eye during near measurements can inflate readings, potentially leading to surgical overcorrection.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Surgical Science

    Background:

    • Strabismus surgery outcomes can be unpredictable.
    • Measurement errors in strabismic deviations may contribute to unpredictability.
    • Accurate measurement of deviations is essential for effective surgical planning.

    Purpose of the Study:

    • To highlight the impact of prism distance on near deviation measurements in strabismus.
    • To explain how incorrect near measurements can lead to surgical overcorrection.
    • To provide a basis for calculating and correcting prism measurements at near.

    Main Methods:

    • The study discusses the principles of prism measurement in relation to eye deviation.
    • It emphasizes the importance of accounting for the distance between the prism and the cornea.

    Related Experiment Videos

  • Calculations for prism effects at near and with Fresnel prisms are considered.

    • Main Results:

    • Prism power required to neutralize near deviations increases with prism distance from the cornea.
    • A specific example shows a 50 prism diopter deviation measuring 62 prism diopters when the prism is 4 cm from the eye.
    • This effect can lead to overestimation of the deviation and subsequent surgical overcorrection.

    Conclusions:

    • Failure to account for prism-to-cornea distance during near fixation measurements can lead to inaccurate strabismus deviation values.
    • Surgical plans based on these inflated measurements risk overcorrection.
    • Accurate calculations and corrections for near prism measurements are necessary for optimal strabismus surgery outcomes.