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Sunlight and cortical cataract

Y R Sharma1, R B Vajpayee, S G Honavar

  • 1Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, Ansarinagar, New Delhi.

Archives of Environmental Health
|September 1, 1994
PubMed
Summary
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Cortical opacities rarely appear in the upper lens without lid retraction. This finding suggests the upper eyelid offers protection against lens opacities, potentially due to thermal damage.

Area of Science:

  • Ophthalmology
  • Lens biology
  • Geriatric medicine

Background:

  • Senile cortical opacities are common age-related changes in the eye's lens.
  • The distribution and potential causes of cortical opacities are not fully understood.
  • The role of external factors, such as eyelid coverage, in lens health is an area of interest.

Purpose of the Study:

  • To investigate the prevalence of cortical opacities in the upper lens segment.
  • To determine the relationship between upper eyelid position and the presence of upper lens opacities.
  • To explore the potential protective role of the upper eyelid against cortical opacities.

Main Methods:

  • Prospective clinical study design.
  • Analysis of 174 eyes with diagnosed cortical opacities.

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  • Assessment of opacity location (specifically the 10- to 2-o'clock positions) and upper eyelid position relative to the limbus.

    • Main Results:

    • Only 15 out of 174 eyes (8.62%) exhibited cortical opacities in the upper lens segment.
    • Lid retraction (upper eyelid at or above the limbus) was present in 13 of these 15 eyes (88.66%).
    • Cortical opacities were rarely observed in the upper lens segment when the upper eyelid was not retracted.

    Conclusions:

    • The upper eyelid appears to have a protective effect against the development of cortical opacities in the normally covered upper lens area.
    • The findings indirectly support the theory that senile cortical opacities may result from cumulative thermal damage to the lens.
    • Further research could explore the specific mechanisms of this protective effect and the role of thermal factors.