These obviously are not at all as nice or authentic as yours but then I don't have as much ambition. I bought these on Amazon. There are others to chose from rather cheap and some more expensive. These served my purpose as a prop when I portrayed an 1830s school teacher for a cemetery walk. I only wore them as each group was approaching.
my period glasses are originals and I simply took them and had real glass lenses with a prescription. probably much safer to use modern lenses.
Tim Twiss has a pair of old glasses that he offered to loan me for the Cemetery Walk but I was afraid I'd do something to damage them and the sides were so short, I couldn't keep them on my head, anyway.
I know we tend to be larger people than they were 160 years ago but I probably would've been about average.