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Early recorded evidence demonstrates that glasses first appeared near Pisa, Italy about the year 1286.

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Bacon's experiments confirmed the principle of the , described by Alhazen (965-1038), "Father of Modern Optics", Arabian mathematician, optician and astronomer at Cairo, and even earlier by the Greeks.They were then manufactured in England beginning in the 15th century.Other centers of production like Germany, France, and Netherlands began to appear more frequently in the sources only by the sixteenth century but they never produced anything near the quantity of the Florentine documentation until well into the seventeenth century.e., about a half century before the latter were thought to have been developed); 2.Florence had become the leading manufacturer of readily available and affordable good-quality spectacles; 3.

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