Effect of humming on vision.
D003624:Darkness; D005133:Eye Movements; D006801:Humans; D008027:Light; D012160:Retina / Q000502:physiology; D009435:Synaptic Transmission / Q000502:physiology; D014732:Vibration; D014785:Vision, Ocular / Q000502:physiology*; D014831:Voice / Q000502:physiology*