( ( ( Looking ( at ( the Sun ) ) ) ( through ( ( any kind ) ( of ( ( optical aid ) ( -LRB- ( ( ( ( ( ( binoculars , ) ( a telescope ) ) , ) or ) ( even ( ( a ( camera 's ) ) viewfinder ) ) ) -RRB- ) ) ) ) ) ) ) ( ( ( ( ( is ( extremely dangerous ) ) , ) and ) ( can ( cause ( permanent blindness ) ) ) ) . ) )
(ROOT (S (S (VP (VBG Looking) (PP (IN at) (NP (DT the) (NNP Sun))) (PP (IN through) (NP (NP (DT any) (NN kind)) (PP (IN of) (NP (NP (JJ optical) (NN aid)) (PRN (-LRB- -LRB-) (NP (NP (NNS binoculars)) (, ,) (NP (DT a) (NN telescope)) (, ,) (CC or) (NP (ADVP (RB even)) (NP (NP (DT a) (NN camera) (POS 's)) (NN viewfinder)))) (-RRB- -RRB-)))))))) (VP (VP (VBZ is) (ADJP (RB extremely) (JJ dangerous))) (, ,) (CC and) (VP (MD can) (VP (VB cause) (NP (JJ permanent) (NN blindness))))) (. .)))
Looking at the Sun through any kind of optical aid (binoculars, a telescope, or even a camera's viewfinder) is extremely dangerous, and can cause permanent blindness.
(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)))) (. .)))