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Related Experiment Videos

Squint in monozygotic twins.

B de Vries, W A Houtman

    Documenta Ophthalmologica. Advances in Ophthalmology
    |March 15, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Strabismus, or squinting, affects both twins in only half of identical twin pairs. Even when both twins have strabismus, its presentation can vary significantly.

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    Area of Science:

    • Ophthalmology
    • Genetics
    • Twin Studies

    Background:

    • Strabismus is a common ocular misalignment.
    • Monozygotic (identical) twins share nearly 100% of their genetic material.
    • Previous studies suggest a genetic component to strabismus.

    Purpose of the Study:

    • To investigate the concordance rate of strabismus in monozygotic twins.
    • To explore the variability in strabismus manifestation among affected twin pairs.

    Main Methods:

    • Study included monozygotic twin pairs where at least one twin had strabismus.
    • Observed and recorded the presence and type of strabismus in both twins.

    Main Results:

    • Strabismus was present in both twins in approximately 50% of the studied monozygotic twin pairs.

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  • Among concordant pairs, the specific manifestation of strabismus showed considerable variation.

    • Conclusions:

    • While genetics play a role in strabismus, environmental factors likely contribute significantly.
    • The incomplete concordance and variable expression highlight the complex etiology of strabismus.