A plano concave lens is an optical lens with one concave surface and one flat surface. It has a negative focal length, and can be used for light projection, beam expansion, or to increase focal length ...

Shanghai Optics manufactures high quality plano-convex lens; optical lenses with a positive focal length. These all-purpose lenses are available in a wide variety of sizes, substrates, and coatings, ...

Two pieces of legislation recently passed in Connecticut promise to improve patient care — one through the regulation of plano contact lens sales and the other through the legal delegation of eye ...