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Related Experiment Videos

One gonioscopic fallacy.

R Mapstone

    The British Journal of Ophthalmology
    |April 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Traditional gonioscopy assumes angle closure increases intraocular pressure. However, this study shows angle closure initially involves iridocorneal contact, not iridotrabecular contact, before pressure rises.

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    Area of Science:

    • Ophthalmology
    • Anatomy
    • Physiology

    Background:

    • Traditional gonioscopy links gonioscopically observed angle closure with elevated intraocular pressure (IOP).
    • This practice assumes that a closed angle directly causes increased IOP.
    • The precise initial mechanism of angle closure requires further clarification.

    Observation:

    • Angle closure begins with iridocorneal contact on the corneal side of the limbus.
    • This iridocorneal contact occurs before the angle is truly closed or visible via gonioscopy.
    • Initially, there is no direct contact between the iris and the trabecular meshwork.

    Findings:

    • The assumption that gonioscopically observed angle closure immediately causes increased IOP is fallacious.
    • Early angle closure involves peripheral iris-cornea apposition without iridotrabecular apposition.

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  • Elevated IOP is a consequence, not the initial cause, of true angle closure.

    • Implications:

    • Revises the understanding of the pathophysiology of angle closure glaucoma.
    • Suggests potential for earlier detection and intervention strategies.
    • Highlights the importance of differentiating iridocorneal contact from iridotrabecular contact in glaucoma diagnosis.