Assertion: single lens | /r/HasProperty | useful
Facets:
value: for children
type: TRANSITIVE-OBJECT
value: for people
type: TRANSITIVE-OBJECT
Source sentences:
text: Single-use lenses are also useful for people who wear contact lenses infrequently, or when losing a lens is likely or not easily replaced (such as when on vacation).
text: They are also considered useful for children because cleaning or disinfecting is not needed, leading to improved compliance.