[Studies on the natural illumination of working areas and certain other etiological factors in a group of Sofia students with special reference to the prevention of myopia].
D006801:Humans; D007858:Learning; D008027:Light; D008029:Lighting; D009216:Myopia / Q000517:prevention & control*; D012572:School Health Services; D013334:Students
LEARNING; MYOPIA/prevention and control; SCHOOL HEALTH