Myopia is caused by a combination of genetic and environmental factors. Lifestyle changes such as reduced physical activity and more close-up work is thought to of great importance.4 Conversely, there is also evidence of a possible protective effect of outdoor presence in the development of myopia. We do not kwow if the protective effect is due to the total time spent outdoors per se or the increased physical activity, although a small study describe a slower development and lower degrees of myopia in children who used more time on outdoor activities and sports than children in a control group. In addition a Danish study of college students (physical education students -vs. medical students) found an association between physical activity, student activity and myopia suggesting a preventive effect of physical activity and less intense study activity on the development and progression of myopia.