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This study provides the first population-based estimate of the prevalence of keratoconus in Iran. The prevalence of topographic keratoconus was high among citizens of Tehran districts 1 to 4. To confirm the hypothesis of a high rate of keratoconus in Iran, more extensive studies are needed which would examine the role of genetics and the environment.
Hashemi et al. (Tue,) studied this question.
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