Assertion: caecilian's eye | /r/HasProperty | covered with bone
Facets:
Source sentences:
text: The degenerate eyes are covered with bone or skin.
text: The eyes are covered by skin or bone so they can only sense light or dark, but more refined sight isn’t needed for a life underground (2).
text: They lack external ears and are entirely or partially blind because their eyes are covered with skin, bones, or both.