Pärssinen O, et al. - Researchers sought to investigate the correlations of near work, outdoors time, and parental myopia with the prevalence of myopia, defined as poor uncorrected distant vision, among different aged school children, and the mutual impacts of these factors on the prevalence of myopia by reanalyzing data collected by questionnaire for a study conducted in 1983 in Central Finland. School children (n = 4,961) from the 1st, 5th and 8th grades of school (7-, 11- and 15-year-olds) in Central Finland were screened for vision followed by a questionnaire, which was returned by 4,352 (87.7%) candidates. Myopia prevalence was 3%, 15%, and 27% among 7-, 11-, and 15-year-olds, respectively, and if daily near work at home was ≤ 1 hr, myopia prevalence was 0.5%, 3.3% and 17.6%, respectively. Myopic parents, more near work time, less outdoor time, a higher near work/outdoors ratio, and being a girl all increased the risk of myopia. Myopia was uncommon in 7- and 11-year-olds whose daily near work at home did not exceed one hour or whose near work/outdoors ratio did not exceed 0.5. Outdoor time was linked to the prevalence of myopia at all levels of near work, though the link was weaker at the highest level.