Methods for determining a progressive ophthalmic lens

US9557578B2 · kind B2 · utility

Assignee

• Essilor International (Compagnie Generale d'Optique) · FR

Inventors

• Jérôme Moine · Charenton-le-Pont, FR
• Céline Benoit · Charenton-le-Pont, FR
• Guillaume Broutin · Charenton-le-Pont, FR
• Carlos Rego · Charenton-le-Pont, FR
• Olivier Roussel · Charenton-le-Pont, FR

Key dates

• Filing date: Sep 6, 2013
• Grant date: Jan 31, 2017
• Expiry date: Sep 6, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C2202/08
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Methods for determining a progressive ophthalmic lens are described, the lens comprising a near and a far vision area, a main meridian separating the lens into a nasal and a temporal area. The method includes determining a first and a second surface of the lens, determining the second surface to provide, in combination with the first surface, vision correcting properties, and determining a spherical area on the first surface of the lens having a constant sphere value and including a far vision diopter measurement position. The far vision diopter measurement position and a near vision diopter measurement position have substantially the same mean sphere value. The method also includes determining the first surface to reduce the lens distortion by defining a toric area extending outside the spherical area on the first surface in at least one of the nasal and the temporal area, in which characteristics of the toric area are related to the lens astigmatism.