We don't have synonyms for retinas yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are retina, retinal and retinae.
(n) :
(ophthalmology) The thin layer of cells at the back of the eyeball that contains rods and cones sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.
(n) :
(ophthalmology) The thin layer of cells at the back of the eyeball that contains rods and cones sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed.