| abstract |
An optical correction element uses a lenticular membrane (1) mounted tensioned on a frame (2), the membrane having a thickness less than that required to be self-supporting, so that radiation can pass even if the material in a self-supporting form came to obstruct the radiation, the corrective element (1, 2) being associated with a spherical mirror (3) or any other form of mirror or lens, and being independent or adhering to the surface of the mirror or lens. |