( ( Concave lens ) ( ( see ( Bi-concave lens ) ) . ) )
(ROOT (S (NP (JJ Concave) (NN lens)) (VP (VBP see) (NP (JJ Bi-concave) (NN lens))) (. .)))
Concave lens see Bi-concave lens .
(ROOT (S (NP (JJ Concave) (NNS lenses)) (VP (MD can) (VP (VB correct) (NP (NN myopia)))) (. .)))