Assertion: strabismus's cause | /r/HasProperty | any need
Facets:
value: for glasses
type: PURPOSE
Source sentences:
text: Other causes of headache related to the eye include difficulty converging both eyes simultaneously to focus on reading, any misalignment of the eyes ( strabismus ) and any need for glasses (for example, nearsighted (myopic), farsighted (hyperopic), or astigmatism.