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Related Experiment Videos

Handedness in strabismics. Etiological implications

A Y Firth1

  • 1University Department of Ophthalmology and Orthoptics, Royal Hallamshire Hospital, Sheffield, UK.

Acta Ophthalmologica Scandinavica
|December 1, 1995
PubMed
Summary

This study found a higher incidence of non-right-handedness in strabismus patients compared to controls, suggesting a developmental defect contributes to strabismus. This link between handedness and strabismus supports theories of developmental origins.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Developmental Biology

Background:

  • Strabismus, or eye misalignment, is a common condition with complex etiologies.
  • Previous research suggests a potential link between developmental factors and the occurrence of strabismus.
  • Handedness, typically lateralized to the right hemisphere, may offer insights into underlying developmental processes.

Purpose of the Study:

  • To investigate the relationship between handedness and strabismus.
  • To determine if non-right-handedness is more prevalent in individuals with strabismus.
  • To explore the implications of handedness patterns for understanding the developmental origins of strabismus.

Main Methods:

  • A comparative study involving 228 strabismic patients and a control group of neurologically normal, non-strabismic individuals.

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  • Assessment of handedness in both groups.
  • Exclusion of strabismic participants with known neurological issues, general health problems, or premature birth to isolate the effect.

    • Main Results:

    • A significantly higher incidence of non-right-handedness was observed in the strabismic group compared to the control group.
    • This difference persisted even after excluding participants with confounding health factors.
    • No significant differences in handedness were found based on the type of retinal correspondence or binocular vision status in strabismic individuals.

    Conclusions:

    • The findings support the hypothesis that a developmental defect underlies strabismus.
    • The observed association between non-right-handedness and strabismus suggests a shared developmental pathway.
    • The severity of the developmental defect may influence the type of strabismus, with external factors also playing a role.