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Gr 1–4—Glasses are nearly ubiquitous now, but who actually invented them? It turns out the first attempt to change a person's vision came around 45 AD and people have been improving them ever since. This book is an illustrated time line of that process and includes diagrams of the eye as well as explanations of why a person might need glasses. There are also diagrams using the nomenclature of gl...Log In or Sign Up to Read More