Opthalmic progressive addition lens for a presbyopic wearer; method for providing such a lens

US10712590B2 · kind B2 · utility

Assignee

• Essilor International · FR

Inventors

• Benjamin Rousseau · Somerville, US
• Melanie Heslouis · Charenton-le-Pont, FR
• Sébastien FRICKER · Charenton-le-Pont, FR
• Nacer Lakhchaf · Charenton-le-Pont, FR
• Guilhem Escalier · Charenton-le-Pont, FR
• Thierry Bonnin · Charenton-le-Pont, FR
• Isabelle Poulain · Charenton-le-Pont, FR
• Valerie Jolivet · Charenton-le-Pont, FR
• Juliette Wierzbicki · Charenton-le-Pont, FR

Key dates

• Filing date: Oct 11, 2016
• Grant date: Jul 14, 2020
• Expiry date: Oct 18, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/066
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An ophthalmic progressive addition lens for a presbyopic wearer which has a prescribed far vision mean refractive power a non nil prescribed addition, ADDp, the lens having a far vision reference point, a mean refractive power, PPO(α, β), a module of resulting astigmatism, ASR(α, β), a meridian line, ML(α, β), the (α, β) functions being determined in as-worn conditions of the lens by the wearer for gaze directions (α, β) joining the center of rotation of the eye, CRE, and the lens, wherein α is a lowering angle in degree and β is an azimuth angle in degree, and wherein α lens criterion, CRIT, fulfils following requirement: 0.38≤CRIT≤4.50, where: CRIT=NumeratorCRIT/DenominatorCRIT, NumeratorCRIT=(A1/A2)+(PPO(αFV, βFV)/(100·ADDp)); A1=α100%−α85%; A2=α100%−α60%; DenominatorCRIT=[(PeaksMean/ADDp)+(PPO(αFV,βFV)/(8·ADDp))]3.