Assertion: eye's lens | /r/CapableOf | become thicker to focus
Facets:
Source sentences:
text: Through the action of small muscles (called the ciliary muscles), the lens becomes thicker to focus on nearby objects and thinner to focus on distant objects.
text: Through the action of small muscles (called the ciliary muscles), the lens becomes thicker to focus on nearby objects and thinner to focus on distant objects.