Eyeglasses that can adapt on the fly to different ... The design is small, light, can produce plano-convex or plano-concave lenses, and can do so quickly (within 15 ms) and with low power ...

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 ...