Abstract
Purpose: To study the effects of air pollution on the eyes of persons staying in the metropolis of New Delhi. Materials and Methods: 400 healthy volunteers from within and outside the metropolis of Delhi were investigated for the presence of tear film abnormalities. All persons underwent slitlamp examination to rule out any ocular surface disorder. The tear break-up time (BUT) was assessed along with a Schirmer test and the tear lysozyme activity and the tear pH were determined. Results: Of the 210 persons staying in the metropolis, 50 (24%) had an abnormal BUT, 14 (6.6%) had an abnormal Schirmer test, and the tear lysozyme activity was found to be low in 12 (5%). In contrast, of those 190 persons living outside the metropolis, only 10 (5.2%) had an abnormal BUT, 4 (2%) had an abnormal Schirmer test, and none had a low lysozyme activity (p < 0.05). None of the persons in either group had significant eye symptoms. Conclusions: Tear film abnormalities are present in a large number of people staying within the metropolis of New Delhi who have apparently normal eyes. Air pollution over a long period of time could possibly be associated with their causation.
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