title: A continuously recording retinal densitometer.
mesh_terms: D003623:Dark Adaptation; D003720:Densitometry / Q000295:instrumentation*; D006801:Humans; D008027:Light; D008991:Monitoring, Physiologic; D012168:Retinal Pigments / Q000502:physiology*; D013997:Time Factors
chemical_list: D012168:Retinal Pigments