Assertion: astigmatism's eye | /r/HasSubevent | headache
Facets:
Source sentences:
text: It causes the eye to have two focal points rather than one and can lead to strain and headaches if uncorrected.
text: Sitting too close to the TV or reading in the dark will not cause astigmatism, but it can weaken the eyes leading to eyestrain, tiredness and headaches.