Anti-dazzle spectacles for night driving has zones of different opacity in the lenses increasing from the top to the bottom to give total transparency in the upper section and a dazzle shield in the lower section

摘要

The anti-dazzle spectacles (10) has lenses (12,13) where the opacity increases from the top to the bottom with an exponential function at the center of the lens. The opacity change is produced by metal deposition on the lens glass to give zones (12',12,13',13) of a different opacity. The transit between the opacity zones is a hysterisis curve. The lens is a plano convex lens, of glass or a transparent plastics material.