Contrast sensitivity and increment threshold.
D000221:Adaptation, Ocular; D000328:Adult; D004056:Differential Threshold; D004192:Discrimination, Psychological / Q000502:physiology*; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D007257:Information Theory; D009474:Neurons / Q000502:physiology; D009949:Orientation / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D012160:Retina / Q000502:physiology; D012858:Size Perception / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology; D014794:Visual Fields; D014795:Visual Pathways / Q000502:physiology*