Variations in brightness at two retinal locations.
D000221:Adaptation, Ocular; D005260:Female; D005584:Fovea Centralis / Q000502:physiology; D006801:Humans; D008027:Light; D010783:Photometry; D012160:Retina / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*