Glasses with multilayered, color-switchable lenses (102) and (104) for blocking harmful radiation include a rim (100) connected to temples (108) and (110). The rim contains a photosensor (116), a color-changing switch (118), a dry-cell power source (120), solar cells (121) and (123), an electronic driver...http://www.google.es/patents/US5184156?utm_source=gb-gplus-sharePatente US5184156 - Glasses with color-switchable, multi-layered lenses
Glasses with color-switchable, multi-layered lenses
