Assertion: irregular astigmatism | /r/CreatedBy | damage
Facets:
value: to the eye
type: OTHER
value: usually
type: TEMPORAL
Source sentences:
text: Irregular astigmatism, on the other hand, is usually caused by damage to the eye and often requires surgery or contacts to improve.
text: Severe cases of “irregular” astigmatism caused by damage to the eye may require a corneal graft.