Studies on the incidence of refractive errors in Egypt.
D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000175:diagnosis; D002648:Child; D002675:Child, Preschool; D004534:Egypt; D005260:Female; D006801:Humans; D006956:Hyperopia / Q000175:diagnosis; D008297:Male; D009216:Myopia / Q000175:diagnosis; D012030:Refractive Errors / Q000175:diagnosis*