Sex and rural-urban differences in the prevalence of childhood visual impairment in Taiwan: A nationwide population-based study

Visual impairment (VI) is a major developmental disability in children, but data at the national level are limited. We conducted a nationwide study in Taiwan to assess the sex and rural-urban differences in VI. Using data from the national disability registry, we calculated prevalence rates by age, sex, and geographic area and assessed changes from 2004 to 2010. We excluded cases under 3 years old because the government discourages certification...