The Prevalence of Eyelid Ptosis in Tehran Population: The Tehran Eye Study

To determine the prevalence of ptosis and its correlation with vision-related variables in Tehran population Through a stratified cluster random sampling, 160 clusters were selected proportional to the population of each municipal district of the city. All consented participants were transferred to the clinic and underwent thorough eye examination. Here we report the prevalence of ptosis with 95% confidence intervals (CI), and its associations with age, gender, amblyopia, astigmatism and previous cataract surgery. The prevalence of ptosis in the studied population was 0.90% (95% CI: 0.58 to 1.21). The prevalence rates of bilateral and unilateral ptosis were 0.46% (95% CI: 0.23 to 0.69) and 0.44% (0.95% CI: 0.21 to 0.66), respectively. The prevalence of ptosis was higher in men (P=0.008) and showed a significant increase with age (P=0.023). The odds of amblyopia was 3.24 times higher among cases of ptosis than those free of the condition (P=0.048). The mean cylinder error in ptotic patients was significantly higher (P=0.006). The prevalence was more in those with previous history of eye surgery (P<0.001). In this study, we found that the prevalence of ptosis in Tehran’s population was low, and is more common in men than women. Age was associated with its prevalence. Also, in accordance with some other studies, amblyopia was shown to be the most serious visual disorder in these cases.