About using eyeglasses as symbols and metaphors in early modern Europe: One could use giant eyeglasses in broadsides to zoom into a topic, like here: https://mastodon.social/@dbellingradt/109624672307990094
One could use calligram-glasses to attract readers to your message, like in this example: http://bdh-rd.bne.es/viewer.vm?id=0000139678&page=1
Or you could use eyeglasses as a metaphor to strengthen the argument in a printed pamphlet: look closer, see better, examine with more quality, you stupid fellow human.
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About forgetting or losing your eyeglasses in early modern Europe: Poor thing, have you lost your glasses again? Have you checked the book you were reading? Most often, when you forgot where you put your eyeglasses to, someone found them between the pages...
The history of reading had a chapter about forgetting eyeglasses in books, and about historians and librarians finding traces of these lost eyeglasses.
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About using your eyeglasses: Mostly, eyeglasses were needed for reading and writing purposes. In this sense, eyeglasses were part of a cultural practice of writing and reading (and drawing to be honest), near books, with books, at a desk, in a library, at an artist's worktable etc.
It is not by chance that Saint Jerome, patron Saint of librarians, is often sitting at a writing desk surrounded by books and papers, with eyeglasses hanging at his desk.
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Daniel Bellingradt
Daniel Bellingradt 