Chronic vision problems of school-age children.
D002648:Child; D002908:Chronic Disease; D006801:Humans; D007859:Learning Disabilities / Q000175:diagnosis; D009468:Neuromuscular Diseases / Q000175:diagnosis; D009801:Oculomotor Muscles; D012030:Refractive Errors / Q000175:diagnosis; D013285:Strabismus / Q000175:diagnosis; D014786:Vision Disorders / Q000175:diagnosis*