My worry is that if someone is unscrupulous enough to produce fakes it's not too much of a jump for them to just use coloured glass for the lenses with no real protection.
Except that glass is more expensive than polycarbonate and would likely break as soon as you tried to put them on with most wraparound style lenses.
@jv started
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My worry is that if someone is unscrupulous enough to produce fakes it's not too much of a jump for them to just use coloured glass for the lenses with no real protection.