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Related Experiment Videos

Hemianopic Fresnel prisms.

J L Smith, I G Weiner, A J Lucero

    Journal of Clinical Neuro-Ophthalmology
    |March 1, 1982
    PubMed
    Summary

    Fresnel prisms offer a practical solution for visual field defects like homonymous hemianopia. This accessible prism treatment can improve patient vision and is easier to obtain than specialized mirrors.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Visual Rehabilitation

    Background:

    • Homonymous hemianopia results in the loss of half of the visual field in the same eye.
    • Existing treatments for visual field defects can be complex or difficult to obtain.

    Observation:

    • A 30-diopter Fresnel prism applied to eyeglasses can be used to treat homonymous hemianopia.
    • The prism is placed on the temporal side of the spectacle lens, potentially with a small central cutout to avoid double vision.

    Findings:

    • This method provides a readily available and simpler alternative to other visual aids like hemianopic mirrors.
    • The Fresnel prism effectively compensates for the visual field loss in patients with homonymous hemianopia.

    Implications:

    • This accessible prism treatment offers a viable option for improving visual function in patients with homonymous hemianopia.
    • The use of Fresnel prisms represents a cost-effective and practical approach to visual rehabilitation for this patient population.

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