Essilor International (compagnie Generale D'optique)

Essilor International Cie Generale D'optique

Jean Thiebaut

Christian Harsigny

Daniel Cornu

Guy Lapeyre

A positive power ophthalmic lens has a central optically active area the diameter of which is at most equal to the diameter of its geometrical contour. It has an optional peripheral merging area around the central optically active area, between the latter and the geometrical contour. The diameter D.sub.1 in millimeters of the central optically active area is related to the power P of the lens in diopters by a general equation of the type:

Large diameter positive power ophthalmic lens

A spectacle cleaning device for domestic use comprises an open-ended container adapted to contain a liquid detergent and the spectacles to be cleaned, a movable cover for sealing the container, means for agitating the liquid detergent and means for actuating said agitating means. The latter may comprise either an air diffusor fed by a pressurized air generator, or a propeller driven by an electric motor.

Growing community of inventors

Paris, France

Jean Thiebaut