An absolute threshold defect in the inferior retina.
D000221:Adaptation, Ocular; D005403:Fixation, Ocular; D006801:Humans; D010786:Photoreceptor Cells / Q000502:physiology; D012160:Retina / Q000196:embryology / Q000294:innervation / Q000502:physiology* / Q000503:physiopathology