Patella oculus Born, 1778[1] Cymbula oculus is a species of sea snail, a true limpet, a marine gastropod mollusc in the family Patellidae, one of the families of true limpets.

The margin of the interior is broad and black, with a light pinkish brown centre.

Juveniles are yellow with iridescent green flecks.

Consumes algae, and large individuals defend themselves by clamping down their shell edges on the predators.

Commensal flatworm Notoplana patellarum lives in the gill cavity under the shell.