ret·i·na 
(rĕtn-ə)
(rĕtn-ə)n. pl. ret·i·nas or ret·i·nae (rĕtn-ē′)
A delicate, multilayered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain.
[Middle English, from Medieval Latin rētina, from Latin rēte, net.]
reti·nal adj.