First of all, in the OP, it's absurd to think the glasses remained in the same antique store for 300 years. They could've been bought, used, and resold a 1000 times in the intervening time for all we kow.
Secondly, it is a bit silly the lenses would be cracked. Even today glasses lenses -and even in 1987- are made of plastic. It seems plausible in the 23rd century they'd be made of some plastic-like material or even transparent aluminium. So that they cracked during the battle with Khan is a bit silly.
Thirdly, the implication to me was that the glasses were part of a closed time loop, that they have no "real" origin which, adimitedly, is silly but that's the implication I got.
Secondly, it is a bit silly the lenses would be cracked. Even today glasses lenses -and even in 1987- are made of plastic. It seems plausible in the 23rd century they'd be made of some plastic-like material or even transparent aluminium. So that they cracked during the battle with Khan is a bit silly.
Thirdly, the implication to me was that the glasses were part of a closed time loop, that they have no "real" origin which, adimitedly, is silly but that's the implication I got.
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