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One of the biggest reasons most "glasses" use a plastic and not glass lens is weight. Many if not a majority of prescriptions will be pretty heavy if the lenses are very large. If you can handle John Lennon style glasses, then glass is the easy answer.
My glasses are a titanium Flexon frame and plastic lenses with UV, and scratch resistance coatings. No line bifocals. They are not cheap by anyone's thinking. I usually get three or so years out of the lenses before I got new lenses in my same frames. I have a cheap set of backup glasses that use a same size lens, so the old lenses get put in the cheap backup glasses.
Look into the Flexon frames. I left them in the seat of my 911, and sat on them. No damage at all. And they got a butt cheek full force.
And try on a pair of glass lens glasses to see if they are heavy. It will all come down to what is comfortable for you. And have them fit to your head by a professional optometrist.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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