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Here you get background information on spectacle lenses. This chapter provides clear, straightforward information on the basics of ophthalmic optics, surface geometry and progressive lenses, lens materials, lens production and coatings, with concrete pictures and some interesting flashbacks to the history of ophthalmic lenses over the centuries.
The solution - a good appearance and good vision with one and the same lens - came in the form of the asphere and the atorus. In 1986 Carl Zeiss was the first manufacturer - and still is the only manufacturer - to offer a single vision lens with an atoroidal front surface: the Hypal lens