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Cataract and latitude

J C Javitt1, H R Taylor

  • 1Worthen Center for Eye Care Research, Georgetown University, Washington, DC, USA.

Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1994
PubMed
Summary
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Exposure to sunlight increases senile cataract risk. Living further south, with higher UV-B exposure, significantly increases cataract surgery likelihood, highlighting the need for eye protection.

Area of Science:

  • Ophthalmology
  • Environmental Health
  • Epidemiology

Background:

  • Senile cataract risk is linked to sunlight exposure, specifically ultraviolet (UV) radiation.
  • Geographic and physical factors influence UV light entry into the eye.
  • Ocular exposure to UV radiation is a significant concern for eye health.

Purpose of the Study:

  • To examine variables affecting UV light entry into the eye.
  • To review epidemiologic evidence linking cataract risk to UV light exposure.
  • To assess the efficacy of protective measures like sunglasses and hats.

Main Methods:

  • Analysis of epidemiologic data from Australia, China, Tibet, and the United States.
  • Utilized data from the Maryland Watermen study.

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  • Examined cataract surgery rates among Medicare beneficiaries in the U.S.

    • Main Results:

    • Latitude of residence was the strongest predictor of cataract surgery likelihood in Medicare beneficiaries.
    • Higher latitude (less direct sunlight) correlated with lower cataract surgery rates.
    • A 3% increase in cataract surgery probability was observed for each degree decrease in latitude (moving south).

    Conclusions:

    • Geographic location and associated UV-B exposure are critical factors in senile cataract development.
    • Personal protective measures are essential to mitigate ocular UV exposure.
    • Further research into UV-related eye conditions is warranted.