Three dB-scales for the standardized visuogram.
D005556:Form Perception / Q000502:physiology*; D006801:Humans; D010364:Pattern Recognition, Visual / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology; D013016:Sound; D014787:Vision Tests / Q000379:methods*; D014792:Visual Acuity