The hinged temple-pieces would suggest a later date. Those appear to have developed in the 18th century, at least in the West.
The internet tells me that museums of eyeglasses exist, but good luck visiting one right now.
and cites Science & Civilisation in China, for which I cannot find an online text.
I linked it in my comment:
"The Sung people, however, did have two techniques which may be considered introductory to spectacle lenses; one was the magnifying glass, and the other dark glasses as eye-protection. Regarding the former, Li Chhi wrote, in his Hsia Jih Chi (Records of Leisure Hours) some time before his death in +1117, that his contemporary, Shih Khang, and other judges, used to use various magnifying lenses of rock crystal (shui ching) for deciphering illegible documents in criminal cases. The judges also used to use dark glasses made of smoky quartz (e.g. chha ching), not, as we do, for driving against the sun, but so as to disguise from litigants their reactions to the evidence." This last sentence is footnoted: "This piece of information, which I fully believe to be true, comes from a paper on fire-pearls and spectacles by Pi (1), which, though interesting, is full of serious and misleading mistakes. The same applies to the paper by Rakusen (1)." No further information is given on the two interesting but misleading papers.
[edit] I went to all the trouble of typing that text out, so I'm leaving it!
no subject
The internet tells me that museums of eyeglasses exist, but good luck visiting one right now.
and cites Science & Civilisation in China, for which I cannot find an online text.
I linked it in my comment:
"The Sung people, however, did have two techniques which may be considered introductory to spectacle lenses; one was the magnifying glass, and the other dark glasses as eye-protection. Regarding the former, Li Chhi wrote, in his Hsia Jih Chi (Records of Leisure Hours) some time before his death in +1117, that his contemporary, Shih Khang, and other judges, used to use various magnifying lenses of rock crystal (shui ching) for deciphering illegible documents in criminal cases. The judges also used to use dark glasses made of smoky quartz (e.g. chha ching), not, as we do, for driving against the sun, but so as to disguise from litigants their reactions to the evidence." This last sentence is footnoted: "This piece of information, which I fully believe to be true, comes from a paper on fire-pearls and spectacles by Pi (1), which, though interesting, is full of serious and misleading mistakes. The same applies to the paper by Rakusen (1)." No further information is given on the two interesting but misleading papers.
[edit] I went to all the trouble of typing that text out, so I'm leaving it!