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tion of hypertension. To study the effect of smoking on tear film parameters and retinal nerve fiber layer thickness (RNFL) in chronic smokers. This was a cross-sectional study, which included 60 (120 eyes) smokers who have smoked at least 10 pack-year and an equal number of healthy subjects as a control for comparison. In addition to history, a detailed slit-lamp examination was done to evaluate the anterior and posterior segments. All patients underwent Schirmer's I test (SIT) with Whatman-41 filter paper, tear meniscus height (TMH), an