( ( ( Phakic ( intraocular lens ) ) ( -LRB- ( PIOL -RRB- ) ) ) ( ( is ( ( a ( special kind ) ) ( of ( ( ( intraocular lens ) ( that ( is ( ( implanted surgically ) ( into ( the ( eye ( to ( correct myopia ) ) ) ) ) ) ) ) ) ( -LRB- ( nearsightedness -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Phakic) (JJ intraocular) (NN lens)) (PRN (-LRB- -LRB-) (NP (NNP PIOL)) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (DT a) (JJ special) (NN kind)) (PP (IN of) (NP (NP (JJ intraocular) (NN lens)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN implanted) (ADVP (RB surgically)) (PP (IN into) (NP (DT the) (NN eye) (S (VP (TO to) (VP (VB correct) (NP (NN myopia))))))))))) (PRN (-LRB- -LRB-) (NP (NNP nearsightedness)) (-RRB- -RRB-)))))) (. .)))
Phakic intraocular lens (PIOL) is a special kind of intraocular lens that is implanted surgically into the eye to correct myopia (nearsightedness).
(ROOT (S (NP (JJ Concave) (NNS lenses)) (VP (MD can) (VP (VB correct) (NP (NN myopia)))) (. .)))