Assertion: contact lens | /r/HasProperty | worn at time
Facets:
value: for a few hours
type: TEMPORAL
Source sentences:
text: It wasn’t until the late 19th century, however, that a German glassblower produced a lens that could be seen through and reasonably tolerated, and a German ophthalmologist came up with and fitted the first contact lens, which could be worn for a few hours at a time.