Assertion: astigmatism | /r/HasProperty | the most common cause
Facets:
value: for discomfort
type: PURPOSE
Source sentences:
text: Astigmatism is the most common cause for discomfort when wearing glasses.
text: Astigmatism is one of the most common, yet least understood conditions for patients.
text: It is the most common vision problem and it may occur with nearsightedness and farsightedness.