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Glass or polycarbonate?

depends what you're doing...

also, glass for windows or glass on eyeglasses? windows - i'd go with glazed or annealed, double-paned glass. better looking, insulates, toughened/tempered glass can be strong as hell.

eyeglasses? polycarb for sure. lighter, cheaper to replace, doesn't SHATTER into a zillion pieces that will turn your cornea into pulp, etcetc
 
I have had tons of polycarbonate and now have had a pair of glass sun glasses for the past 2 years.

Hands down glass>polycarbonate.

They are much harder to scratch and I personally like the weight they have.

 
Glass
slighly heavier than poly but you aren't trying to support your coke bottles up there just the basic thickness for sunglasses
 
Glass is heavier and can shatter.
Polycarbonate is shatter resistant but scratches pretty easily. It also can't be tinted as darkly (according to the folks who just made my glasses)
Plastic isn't as shatter resistant but can be tinted more darkly than polycarb. Both are lighter than glass.

Edit: and I don't care what they say, those "anti-scratch" coatings still scratch easily. Next time, I'm going to tell the opticians to give it 3 or 4 anti-scratch coats 🙂

 
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