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eyeglasses, spectacle, “readingglasses”, “polishinglenses”, lenses, “eyeexamination”, ophthalmology, vision, ocular, view, perception, seeing, monocle, eye, “visualreceptor”, optic, “convexlenses”, “concavelenses”, “refraction, “transmissionofimages”, optical, “humaneye”, “printsandphotographs”, pp, nationallibraryofmedicine, nlm, imagesfromthehistoryofmedicine, ihm, historyofmedicinedivision, hmd, “nationalinstitutesofhealth”, nih, stillimage, eyewear, handlens, candle, monkey, publicdomain, archivesofmedicine, nlmdigitalcollection, primate
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