Assertion: ortho k lens | /r/HasProperty | worn
Facets:
value: at night
type: TEMPORAL
Source sentences:
text: Overnight Ortho-K lenses are commonly prescribed to be worn while sleeping for at least eight hours each night.
text: Ortho-K lenses must continue to be worn every night or on some other prescribed maintenance schedule in order to maintain the treatment effect.
text: Most ortho-k lenses are worn at night to reshape the front surface of the eye while you sleep.