( ( ( This ( normal ( aging process ) ) ) ( of ( the lens ) ) ) ( ( ( can also ) ( be ( combined ( with ( myopia ( , ( ( hyperopia or ) astigmatism ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT This) (JJ normal) (VBG aging) (NN process)) (PP (IN of) (NP (DT the) (NN lens)))) (VP (MD can) (ADVP (RB also)) (VP (VB be) (VP (VBN combined) (PP (IN with) (NP (NN myopia) (, ,) (NN hyperopia) (CC or) (NN astigmatism)))))) (. .)))
This normal aging process of the lens can also be combined with myopia, hyperopia or astigmatism.
(ROOT (S (NP (JJ Concave) (NNS lenses)) (VP (MD can) (VP (VB correct) (NP (NN myopia)))) (. .)))