Assertion: tuatara's lens | /r/HasProperty | cornea
Facets:
Source sentences:
text: The uncommon eye on their forehead is hidden by scales, has a lens, a cornea, a retina and even connects to the brain via primitive optic nerves.
text: But it’s far more developed and pronounced in the tuatara, containing a lens, a cornea, a retina (with rod-like cells) and a primitive optic nerve connecting it to the brain.