Anisometropia that is severe enough to be a risk factor for amblyopia is fairly uncommon, according to a study by the Baltimore Pediatric Eye Disease Study (BPEDS), a population-based study of African-American and non-Hispanic white children aged 6 months to 71 months. The study was designed to estimate the prevalence and risk factors for pediatric ocular diseases such as anisometropia. For anisometropia of greater than 2.00 diopters, the Baltimore study found a prevalence of 1.5% among white children and 1.0% among African American children. More severe anisometropia of greater than 3.00 diopters was present in only 0.7% of whites and 0.2% of African-Americans.
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