Ophthalmic lens with progressive addition of power and prism

US7216977B2 · kind B2 · utility

Assignee

• Essilor International (Compagnie Generale d' O{circumflex over (p)}tique) · FR

Inventors

• Isabelle Poulain · Charenton-le-Pont, FR
• Björn Drobe · Singapore, SG
• Clotilde Haro · Créteil, FR
• Pascal Allione · Charenton-le-Pont, FR
• Francoise Ahsbahs · Châteauroux, FR

Key dates

• Filing date: Jan 30, 2004
• Grant date: May 15, 2007
• Expiry date: May 14, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C2202/24
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The lens presents horizontal prismatic refractive power that varies progressively along the main progression meridian (MM′) with the addition of horizontal prismatic power being greater than 2 prismatic diopters in absolute value, this addition of horizontal prismatic power being defined by the difference between the horizontal prismatic refractive power at the reference point (L) of the far vision zone and the horizontal prismatic refractive power at the projection point (P′) of the reference point (P) of the near vision zone (VP) on the vertical line passing through the reference point (L) of the far vision zone.