title: Reply to Johnson and Wright.
authors.forename: David
authors.initials: D
authors.lastname: Philipona
authors.forename: J Kevin
authors.initials: JK
authors.lastname: O'Regan
mesh_terms: D003116:Color; D003118:Color Perception / Q000502:physiology*; D006801:Humans; D008027:Light; D017949:Retinal Cone Photoreceptor Cells / Q000528:radiation effects*; D012542:Scattering, Radiation; D009626:Terminology as Topic