( or ( ( the pupillary ) ( ( reflex ( -LRB- ( ( ( ( ( The ( baby 's ) ) pupil ) ( will ( ( constrict ( to ( ( a light ) ( shined ( at it ) ) ) ) ) ( ( as soon ) ( as ( ( the eyes ) open ) ) ) ) ) ) . ) -RRB- ) ) ) . ) ) )
(ROOT (S (CC or) (NP (DT the) (NN pupillary)) (VP (VP (VBZ reflex)) (PRN (-LRB- -LRB-) (S (NP (NP (DT The) (NN baby) (POS 's)) (NN pupil)) (VP (MD will) (VP (VB constrict) (PP (TO to) (NP (NP (DT a) (NN light)) (VP (VBN shined) (PP (IN at) (NP (PRP it)))))) (SBAR (ADVP (RB as) (RB soon)) (IN as) (S (NP (DT the) (NNS eyes)) (ADJP (JJ open))))))) (. .) (-RRB- -RRB-))) (. .)))
or the pupillary reflex (The baby's pupil will constrict to a light shined at it as soon as the eyes open.).
(ROOT (S (NP (DT The) (NN pupil)) (VP (VBZ is) (NP (NP (DT the) (NN opening)) (PP (IN in) (NP (NP (DT the) (NN front)) (PP (IN of) (NP (DT the) (NN eye))))))) (. .)))