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Astigmatism is one of the most common childhood vision problems. About 10% of preschool children have astigmatism, according to a study funded by the National Eye Institute (NEI), which is part of the National Institutes of Health (NIH). The same study found that it is particularly prevalent among very young children, with 23 percent of children between the ages of 6 months and 1 year old having astigmatism. But many grow out of it. By the times children are 5 to 6 years old, only 9 percent had astigmatism.1