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Benjamin Franklin is credited for invention of bifocal lens. With a bifocal lens bottom half is used for reading and top half is for seeing objects that re further in distance.
The first lenses in prescription eyeglasses were made from quartz crystal and very low in quality and durability. Then in early 1900's, Bausch and Lomb created glass lens. Today most prescription eyeglasses are made from a plastic material that can be polished and tinted like glass lenses. The advantage to plastic lens is lighter weight of prescription eyeglasses as well as durability is greatly increased.
Timothy Gorman is a successful Webmaster and publisher of Vision-Doctor.com. He provides more discount sunglasses, contact lenses, LASIK information and discount prescription eyeglasses information that you can research in your pajamas in your home.