Invention Patent
ITRM930802D0
未知
- Patent Title:
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Application No.: ITRM930802Application Date: 1993-12-03
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Publication No.: ITRM930802D0Publication Date: 1993-12-03
- Inventor: HARSIGNY CHRISTIAN , MIEGE CHRISTIAN , CHAUVEAU JEAN-PIERRE , AHSBAHS FRANCOISE
- Applicant: ESSILOR INT
- Assignee: ESSILOR INT
- Current Assignee: ESSILOR INT
- Priority: FR9214929 1992-12-11
- Main IPC: G02C7/06
- IPC: G02C7/06 ; G02C7/02 ; G02C
Abstract:
A progressive multifocal ophthalmic lens is provided having an aspherical surface comprising a distance vision portion, a near vision portion and an intermediate vision portion, in which the maximum mean sphere gradient value is situated in the intermediate vision portion of the principal meridian of progression of the lens, and the cylinder gradient over the whole aspherical surface of the lens is less than the product obtained by multiplying the power addition value at each point by a constant value coefficient.
Public/Granted literature
- IT1266442B1 Public/Granted day:1996-12-30
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