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[Vertical and tortional deviations in early strabismus].

A Spielmann

    Bulletin Des Societes D'Ophtalmologie De France
    |April 1, 1990
    PubMed
    Summary

    Eye occlusion can cause deviations like heterophorias and dissociated deviations, particularly in infantile strabismus. Dissociated torsional deviation (DTD) is complex, with extorsion indirectly proven by other eye movement studies.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Vision Science

    Context:

    • Eye occlusion can induce two main types of ocular deviation: heterophorias and dissociated deviations.
    • Dissociated deviations, including horizontal (DHD), vertical (DVD), and torsional (DTD), are characteristic of infantile strabismus.
    • Unlike heterophorias, dissociated deviations result from an imbalance in binocular retinal stimulation, not a return to an abnormal resting position.

    Purpose:

    • To differentiate between heterophorias and dissociated deviations triggered by eye occlusion.
    • To explore the characteristics and diagnostic challenges of dissociated torsional deviation (DTD).
    • To investigate the relationship between dissociated deviations and infantile strabismus.

    Summary:

    • Eye occlusion can lead to heterophorias (where fusion corrects deviation) or dissociated deviations (seen in infantile strabismus).
    • Dissociated deviations stem from imbalanced binocular stimulation, with the deviation being smaller than the occluded eye's movement.
    • Dissociated torsional deviation (DTD) is challenging to measure directly; its presence, often an extorsion, is inferred from associated horizontal/vertical deviations and symptoms like bilateral elevation in primary gaze.

    Impact:

    • Clarifies the mechanisms underlying different types of eye deviation induced by occlusion.
    • Highlights the diagnostic complexities of dissociated torsional deviation (DTD).
    • Reinforces the association of dissociated deviations with infantile strabismus and related phenomena.

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