Visual performance of children in Norwegian special schools.
D000293:Adolescent; D002648:Child; D003118:Color Perception; D006233:Persons with Disabilities; D005133:Eye Movements; D005260:Female; D006801:Humans; D008297:Male; D009664:Norway; D014786:Vision Disorders / Q000453:epidemiology; D014787:Vision Tests; D014785:Vision, Ocular; D014792:Visual Acuity