David Baker explains the link between optics and one of the founding fathers of the United States of America
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Franklin was a confirmed spectacle wearer by his 30s. His real problems began, of course, when he became presbyopic. It was a straightforward process to order reading glasses of various powers at that time. A wealthy person, such as Franklin, who realised the reading power would need increasing over the years, could purchase an entire set of lenses. This he certainly did for other people.
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