The British journal of ophthalmology
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To analyse the factors associated with myopia in school-aged children with preterm birth and with or without retinopathy of prematurity (ROP). ⋯ Among preterm children with or without ROP, more time spent outdoors was associated with lower odds of myopia. The serum 25(OH)D concentration was not associated with myopia, but a high proportion of the participants had insufficient levels.