Patent · US Active

Progressive lens for ophthalmic spectacles, having an additional zone for intermediate vision

US8061838B2 · kind B2 · utility

22Cited by

3References

17Claims

0Family size

Assignee

Essilor International (Compagnie Generale d'Optique) · FR

Inventors

Guillaume Giraudet · Charenton-le-Pont, FR
Isabelle Poulain · Charenton-le-Pont, FR

Key dates

Filing date	Dec 3, 2008
Grant date	Nov 22, 2011
Priority date	—
Expiry date	Dec 17, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG02C7/061
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A progressive lens for ophthalmic spectacles has an additional zone for intermediate vision. This additional zone is located beneath a near-vision zone. It enables objects located at a distance of between 1.0 and 1.5 meters, in a direction inclined at about 35 degrees to a line of sight passing through a cross mark (CM) on the lens, to be seen clearly. To achieve this, the optical power progression between a far-vision point (FV) and a near-vision point (NV) of said lens has a power-increase threshold which is located approximately at the cross mark.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.