( BLINDNESS ( ( will ( result ( from ( looking ( at ( ( ( the sun ) , ) ( either ( ( directly or ) ( through ( a viewfinder ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS BLINDNESS)) (VP (MD will) (VP (VB result) (PP (IN from) (S (VP (VBG looking) (PP (IN at) (NP (NP (DT the) (NN sun)) (, ,) (UCP (DT either) (ADVP (RB directly)) (CC or) (PP (IN through) (NP (DT a) (NN viewfinder))))))))))) (. .)))
BLINDNESS will result from looking at the sun, either directly or through a viewfinder.
(ROOT (S (S (VP (VBG Looking) (ADVP (RB directly)) (PP (IN at) (NP (DT the) (NN sun))))) (VP (MD can) (VP (VB cause) (NP (NN blindness)))) (. .)))