Assertion: astigmatism's cornea | /r/HasProperty | the lens
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: A condition when the Cornea, (sometimes the lens) curves differently in different directions (a slice through a football).
text: Astigmatism is a condition in which the cornea (or, much less often, the lens) is unevenly curved, causing light to be unevenly refracted.