Polyspherical lens description, 1702

Polyspherical lens description, 1702

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Caption: Polyspherical lens description. Diagram and Latin description of the polyspherical lens on a page from the 1702 edition of Oculus Artificialis. This book on optics and optical instruments and devices was published by the German monk and author Johann Zahn (1641-1707). It is thought that this lens design by Zahn was the first design of a trial lens, a type of lens used to test eyesight.

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