PROGRESSIVE MULTIFOCAL OPHTALMIC LENS

PROGRESSIVE MULTIFOCAL OPHTALMIC LENS

A progressive multifocal ophtalmic 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...

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Hauptverfasser: AHSBAHS, FRANCOISE, HARSIGNY, CHRISTIAN, MIEGE, CHRISTIAN, CHAUVEAU, JEAN-PIERRE
Format: Patent
Sprache:eng ; fre
Schlagworte:
CONTACT LENSES
OPTICS
PHYSICS
SPECTACLES
SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES
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creator AHSBAHS, FRANCOISE
HARSIGNY, CHRISTIAN
MIEGE, CHRISTIAN
CHAUVEAU, JEAN-PIERRE
description A progressive multifocal ophtalmic 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.
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subjects CONTACT LENSES
OPTICS
PHYSICS
SPECTACLES
SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES
title PROGRESSIVE MULTIFOCAL OPHTALMIC LENS
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