BRILLE MIT VARIABLEN FOKUS

摘要

The invention concerns variable focus spectacles in which the electro-wetting effect is utilized to provide a manually or automatically variable focal length. The variable focus spectacles (200) comprise a spectacle frame (210) and at least one variable power lens (100A, 100B). The lens (100) comprises a transparent rear wall (110), a transparent front wall (120), a cavity (140) formed between the transparent front wall (120) and the transparent rear wall (110), first and second immiscible fluids of differing refractive index contained within said cavity, and electrodes (150, 160) for applying an electric field to said fluids to change a contact angle between an interface layer (M) of the two fluids and the front wall of the lens.