We don't have synonyms for phosphene yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are phosphate, phosphine and phosphane.
(n) :
A sensation of lights induced by mechanical, electrical, or magnetic stimulation (rather than optical) of the retina or visual cortex, or by random firing of cells in the visual system.
(n) :
A sensation of lights induced by mechanical, electrical, or magnetic stimulation (rather than optical) of the retina or visual cortex, or by random firing of cells in the visual system.