Process for preparation of spectacles

US4762407A · kind A · utility

Assignee

• Wilhelm Anger · AT

Inventors

• Wilhelm Anger · Sankt Moritz, CH
• Eric Steinhauer · Tustin, US

Key dates

• Filing date: Nov 29, 1984
• Grant date: Aug 9, 1988
• Expiry date: Nov 29, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C13/003
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The process in accordance with the present invention is especially well-suited for the preparation of spectacles with a correction effect which are adapted both optically and mechanically, whereby the mechanical adaptation is objectified to at least a considerable degree and the mechanical adaptation depends to a lesser extent or not at all on subjective evaluations of the fits of the spectacles on the part of the fitter or the spectacle wearer. For each nose piece of the spectacles the location of at least one nose point on or near the contact surface at which the bridge reposing surface touches the nose, is measured in space relative to two reference points, for example, the eye centers. From this nose point measurement the location of the pad nose piece reposing surface which the latter is to occupy in space on the completed spectacles is determined, which occurs, for example, under the assumption of pressureless contact between the contact surface and the reposing surface. Corresponding to this determination the nose piece of the spectacles are physically shaped, specifically in their correct relative position with respect to the lenses since a target position has been predeter…