A power law for contrast discrimination.
D000221:Adaptation, Ocular; D000328:Adult; D004056:Differential Threshold; D004192:Discrimination, Psychological / Q000502:physiology*; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D010364:Pattern Recognition, Visual / Q000502:physiology*; D013028:Space Perception / Q000502:physiology*; D013997:Time Factors; D014792:Visual Acuity