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Handing it to pterygium: Explaining pterygium laterality.

Minas T Coroneo1, Lien Tat2, Helen Chen2

  • 1Department of Ophthalmology, Prince of Wales Hospital, Randwick, NSW, Australia; The University of New South Wales, Sydney at the Prince of Wales Hospital, Clinical School, Randwick, NSW, Australia; Ophthalmic Surgeons, Randwick, NSW, Australia.

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|December 14, 2020
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Summary

Patient handedness is significantly correlated with pterygium laterality. Individuals with right-sided pterygia are more often right-handed, and left-sided pterygia are more common in left-handed individuals.

Keywords:
HandednessLateralityPterygiumPterygium pathogenesis

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Area of Science:

  • Ophthalmology
  • Ocular Surface Disease
  • Epidemiology

Background:

  • Pterygium is a common ocular surface condition.
  • Its etiology is multifactorial, with UV exposure being a primary risk factor.
  • The role of patient-specific factors like handedness remains less understood.

Purpose of the Study:

  • To investigate the potential correlation between a patient's dominant hand and the affected eye in pterygium.
  • To determine if handedness influences pterygium laterality in unilateral and bilateral cases.

Main Methods:

  • Retrospective observational study of 219 pterygium patients from two centers.
  • Assessment of patient handedness and comparison with pterygium laterality (right/left).
  • Correlation statistics and analysis of pterygium size in bilateral cases.

Main Results:

  • A significant association (p < 0.001) was found between handedness and pterygium laterality.
  • Right-handed patients were more likely to have right-sided pterygia (OR 2.327).
  • Left-handed patients were more likely to have left-sided pterygia (OR 5.717).
  • In bilateral cases, pterygia were larger and longer in the eye ipsilateral to the dominant hand.

Conclusions:

  • Handedness is a novel contributing factor to pterygium laterality.
  • Findings align with theories on asymmetrical ocular UV exposure and light focusing.
  • Further research may inform protective strategies against pterygium development.