The association between breastfeeding and subsequent development of myopia was examined in a cross-sectional study of 797 children aged 10-12 years in Singapore. The prevalence of myopia was significantly lower in children who had been breastfed than in those who had not (62% vs. 69.1%; p = 0.04). A history of being breastfed was associated with a decreased risk of myopia (odds ratio = 0.73; 95% confidence interval, 0.54-0.98). The duration of breastfeeding (three months or less vs. more than three months) was not associated with myopia risk.

Comment: The results of this study suggest that breast-feeding, even for a relatively short period time, can reduce the incidence of nearsightedness among children. Presumably, certain substances in human milk influence the shape of the developing eyeball or cornea. Prevention of myopia can now be added to the long list of potential benefits to be derived from breast-feeding, including better brain development, improved immune function, and lower risk of allergies.

Chong YS, et al. Association between breastfeeding and likelihood of myopia in children. JAMA. 2005;293:3001-3002.