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Distribution of spherical powers of refractive errors measured by Spot vision screener in 813 right eyes and 813 left eyes of all 813 children. Five measurements with a value indicated as >+7.5 diopters in both eyes of two children and the right eye of another child are not plotted. Red horizontal lines indicate borderlines outside the normal range set by Spot vision screener at the age of 36–72 months: hyperopia greater than +2.5 diopters and myopia greater than −1.25 diopters.
