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Eyeballing Your Eyeglasses - A guide to frame measurements
Spectacles:tortoiseshell, England 1740-1770: The 18th century saw great strides in the evolution of spectacles. One important development were frames and different lenses for different ranges of optical power. Circa 1730 Edward Scarlett of Soho advertised that he: 'Grindeth all manner of Optick Glasses (and)makes spectacles after a new method, marking the Focus of the Glass upon the Frame, it being approv'd of by all the Learned in Opticks as [the] Exactest way of fitting different Eyes'.