Synopses & Reviews
Synopsis
Excerpt from Ophthalmic Lenses and Accessories: Lenses, Frames, Magnifiers and Readers
The first lenses seem to have been of the convex form only. We find among the ancients no reference to diverging lenses, although short sight was well known as a defect of the eye. It is not until the end of the seventeenth century that we learn of concave lenses being ground.
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