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Cortical lenticular opacification: distribution and location in a longitudinal study
1Dana Center for Preventive Ophthalmology, Wilmer Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Investigative Ophthalmology & Visual Science
|February 1, 1994
Summary
The inferonasal quadrant is the primary site for cortical opacification in the lens. This distribution pattern suggests sunlight exposure may be a significant risk factor for developing this age-related eye condition.
Area of Science:
- Ophthalmology
- Epidemiology
Background:
- Age-related cataracts, specifically cortical opacities, affect vision.
- Understanding the spatial distribution of lens opacities is crucial for etiological research.
Purpose of the Study:
- To investigate the specific distribution patterns of cortical opacification within different lens quadrants.
- To analyze the longitudinal changes in cortical opacification over a five-year period.
Main Methods:
- A cohort of Chesapeake Bay watermen (437 subjects, 834 eyes) was assessed in 1985 and 1990.
- Cortical photographs were graded for total area and predominant quadrant of opacification.
- Statistical analysis compared opacification distribution against expected values.
Main Results:
- Cortical opacification prevalence and severity increased with age.
- The inferonasal quadrant was the most frequent site (63.8%) of opacification, significantly more than other quadrants (P < 0.001).
- Both new opacification development and progression showed a strong preference for the inferonasal quadrant over five years.
Conclusions:
- The inferonasal quadrant is the principal location for cortical opacification in this population.
- These findings support the hypothesis that cumulative sunlight exposure is a major risk factor for cortical lens opacities.