Assertion: cornea | /r/CapableOf | affect 1 in 500 people
Facets:
value: in the u.s.
type: LOCATION
value: in their teens
type: TEMPORAL
value: in 20s
type: OTHER
Source sentences:
text: Keratoconus is a progressive thinning of the cornea that affects 1 in 500 people in the U.S., usually in their teens and 20s, but it can occur in nearly every decade of life.