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90%; 95% CI 0.85%-0.95%). The average prevalence of keratoconus in the United States in 2016 may be higher than previously reported. Living in Western states and male sex were associated with high prevalence. The average prevalence of keratoconus in the United States in 2016 may be higher than previously reported. Living in Western states and male sex were associated with high prevalence. To assess the potential effects of switching to online lecture format on dry eye symptoms and dry eye disease (DED) risk factors. An anonymous cross-sectional online surve