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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