Myopia and night-time lighting during sleep in children and adults

This cross-sectional study investigated the relationship between different lighting conditions experiments during sleep in the first two years of life and development of myopia after age two as reported retrospectively by parents in a total of 469 individuals, including 252 children aged 2-16 yr., and 217 adults aged 17-40 yr. There were no significant differences in incidence of myopia in children who had slept from 0-2 yr. in darkness, with a night light, room light, or hall light. Adults who were reported by their parents to have slept with a night light on from 0-2 yr. were significantly more likely to be myopic than those who were reported to have slept from 0-2 yr. in any other lighting condition.