These are typically mounted on an eyeglass frame or custom-fit onto eyeglasses. Eyeglass lenses that combine spherical and cylindrical correction are toric lenses. He invented the eyeglass lens designs that became the Zeiss Punktal lenses. These polycarbonates are used in eyeglass lenses, compact discs, and bulletproof glass. Eye relief can be particularly important for eyeglass wearers. An example is eyeglass lenses that are used to correct astigmatism in someone's eye. They are trained and licensed to cut, fit and adjust eyeglass frames/lenses. Eye relief distance can be particularly important for eyeglass wearers and shooters. Eye care professionals use prism correction as a component of some eyeglass prescriptions. When the war prevented import of eyeglass frames, demand for his hard rubber frames skyrocketed. However, strong eyeglass prescriptions create distortions such as prismatic movement and chromatic aberration. The Muslimeen stepped in, offering food, eyeglass frames, and organised medical and dental appointments. Eyeglass frames made from titanium-containing SMAs are marketed under the trademarks Flexon and TITANflex. This can be resolved with a proper eyeglass prescription. Over-the-counter medical devices, such as bandages, crutches, and eyeglass repair kits, are allowable.