( It ( ( is ( corrected ( by ( ( the use ) ( of ( a ( concave lens ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (VP (VBN corrected) (PP (IN by) (NP (NP (DT the) (NN use)) (PP (IN of) (NP (DT a) (JJ concave) (NN lens))))))) (. .)))
It is corrected by the use of a concave lens.
(ROOT (S (NP (JJ Concave) (NNS lenses)) (VP (MD can) (VP (VB correct) (NP (NN myopia)))) (. .)))