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Hi. I'm online and happy to answer your question today.
There is nothing that you need to do or can do to keep "really good vision" ie: not needing glasses. Already, by getting good genes from your parents you already have an very good chance of keeping excellent vision just like they have.
Ok, understood. Thank you :)
I would be that they only use glasses to read with......presbyopia is a natural thing that was designed by whoever is in charge to sell glasses to old folks! lol.