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Related Experiment Videos

Nonaccommodative convergence excess.

G K von Noorden, C W Avilla

    American Journal of Ophthalmology
    |January 15, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Nonaccommodative convergence excess, a condition causing large-angle esotropia at near, can be effectively treated with medial recti muscle recession or posterior fixation surgery. Surgical intervention significantly corrected esotropia at both distance and near.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Binocular Vision

    Background:

    • Nonaccommodative convergence excess presents as orthotropia or small-angle esophoria/esotropia at distance with large-angle esotropia at near.
    • This condition is characterized by a normal or subnormal AC/A ratio and is suspected to involve tonic convergence.
    • Distinguishing it from high AC/A ratio esotropia and hypoaccommodative esotropia is crucial for appropriate management.

    Purpose of the Study:

    • To evaluate the efficacy of surgical interventions for nonaccommodative convergence excess.
    • To assess the degree of esotropia correction achieved through medial recti muscle recession and posterior fixation techniques.

    Main Methods:

    • The study involved 24 patients diagnosed with nonaccommodative convergence excess.

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  • Surgical treatments included recession of both medial recti muscles, with or without posterior fixation, or posterior fixation alone.
  • Esotropia correction was measured at both distance and near visual acuities.

    • Main Results:

    • Surgical treatment resulted in a mean correction of 7.4 prism diopters for distance esotropia.
    • A mean correction of 17 prism diopters was achieved for near esotropia.
    • The surgical approaches demonstrated significant efficacy in correcting esotropia associated with this condition.

    Conclusions:

    • Medial recti muscle recession and posterior fixation are effective surgical treatments for nonaccommodative convergence excess.
    • These surgical methods provide substantial correction of esotropia, improving binocular vision at both distance and near.
    • Accurate diagnosis and timely surgical intervention are key to managing this complex binocular vision disorder.