The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 2011
Filed:
Dec. 12, 2006
Bjorn Drobe, Kerrisdale, SG;
Claude Pedrono, Briis-Sous-Forges, FR;
Bjorn Drobe, Kerrisdale, SG;
Claude Pedrono, Briis-Sous-Forges, FR;
Essilor International (Compagnie Générale d'Optique), Charenton Cedex, FR;
Abstract
A method for determining a progressive ophthalmic lens for a given user for whom a near vision power addition has been prescribed includes the following steps: measuring the user's downward and the vertical horopter on a near-vision target point; measuring the user's near-vision head elevation and/or eye elevation; determining a coefficient of the user's near-vision vertical head participation (Ptv); determining a user-specific progressive length (LP) defined by the relationship LP=H (1−Ptv), the progressive length being defined as the downward look angle between the mounting cross and the meridian point for which the power achieves the power addition; determining the lens by optimizing in optical computation in worn conditions, using as target a power variation along the meridian with a progressive length equal to said user-specific progressive length.