( ( ( ( The ( concave ( lens -RRB- ) ) ) -LRB- ) ( bends ( ( the lasers ) apart ) ) ) . )
(ROOT (NP (NP (NP (DT The) (JJ concave) (NN lens) (-RRB- -RRB-)) (-LRB- -LRB-) (NP (RB bends) (NP (DT the) (NNS lasers)) (ADVP (RB apart)))) (. .)))
The concave lens )( bends the lasers apart.
(ROOT (S (NP (JJ Concave) (NNS lenses)) (VP (MD can) (VP (VB correct) (NP (NN myopia)))) (. .)))