Limiting factors in threshold and suprathreshold vision.
D006801:Humans; D008027:Light; D008266:Macula Lutea / Q000502:physiology; D009622:Noise; D055095:Optics and Photonics; D010786:Photoreceptor Cells / Q000502:physiology; D014785:Vision, Ocular; D014792:Visual Acuity