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etching, lookingglass, oldman, holdingthelensetotheeye, stillimage, nationallibraryofmedicine, imagesfromthehistoryofmedicine, ihm, historyofmedicinedivision, seeingclearly, “printsandphotographs”, pp, nlm, hmd, “nationalinstitutesofhealth”, nih, eyeglasses, spectacle, “readingglasses”, “polishinglenses”, lenses, “eyeexamination”, ophthalmology, vision, ocular, view, perception, seeing, monocle, eye, “visualreceptor”, optic, “convexlenses”, “concavelenses”, “refraction, “transmissionofimages”, optical, “humaneye”, eyewear, publicdomain, britain, unitedkingdom, albion, britannica, kingdom, england, uk, english, archivesofmedicine, nlmdigitalcollection
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