Most vision researchers believe that<unk> s result from the normal activity of the visual system after stimulation of one of its parts from some stimulus other than light. For example, Grüsser et al. showed that pressure on the eye results in activation of retinal ganglion cells in a similar way to activation by light. An ancient, discredited theory is that light is generated in the eye. A version of this theory has been revived, except, according to its author, that<unk>  lights are supposed to be due to the intrinsic perception of induced or spontaneous increased biophoton emission of cells in various parts of the visual system (from retina to cortex)"
Phosphene
Magnetophosphene
Theobromine
Toxaphene
Desmethylchlorotrianisene
Chlorotrianisene
Menthol
Esthiomene