( Light ( ( ( ( ( enters ( ( the front ) ( of ( the eye ) ) ) ) ( through ( the pupil ) ) ) and ) ( is ( ( focused ( by ( the lens ) ) ) ( onto ( the retina ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Light)) (VP (VP (VBZ enters) (NP (NP (DT the) (NN front)) (PP (IN of) (NP (DT the) (NN eye)))) (PP (IN through) (NP (DT the) (NN pupil)))) (CC and) (VP (VBZ is) (VP (VBN focused) (PP (IN by) (NP (DT the) (NN lens))) (PP (IN onto) (NP (DT the) (NN retina)))))) (. .)))
Light enters the front of the eye through the pupil and is focused by the lens onto the retina.
(ROOT (S (NP (NP (DT The) (NN pupil)) (PP (IN of) (NP (DT the) (NN eye)))) (VP (VBZ allows) (ADJP (JJ light) (S (VP (TO to) (VP (VB enter)))))) (. .)))
The pupil of the eye allows light to enter.