" if you mean that he will go to the store in addition to doing other things. "
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[ Subject + ALSO + Modal ], as in your first sentence, is not really idiomatic written English.
A small, final point: We English speakers say "cataracts" (plural) in this context.
"Sunglasses also can help reduce..." may mean that sunglasses can help reduce the risk of cataracts besides doing something else. You can say "Sunglasses will protect your eyes from direct sunlight. They also can help..."Say...how do you get q
"Sunglasses can also help..." may mean that they can do something else besides helpind reduce the risk of cataracts.