Method for the determination of a progressive ophthalmic lens
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsMarie-Anne Berthezene, Céline Carimalo, Diane De Gaudemaris, Cyril Guilloux
Life of this patent
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Abstract
A method for the determination of a progressive ophthalmic lens for a given wearer comprises the states of: determining the axial length (LA) of the wearer's eye, determining an ergorama associating a sight point with each direction of viewing under wearing conditions, determining power and resulting astigmatism defect targets for each direction of viewing under wearing conditions, the targets being a function of the axial length of the wearer's eye, calculating the power required on the lens for each direction of viewing by successive iterations in order to obtain the target power defect and the target resulting astigmatism.
Claims3
A progressive ophthalmic lens personalized for the needs of a wearer, said lens having, under wearing conditions, a distribution of power defect and a distribution of resulting astigmatism depending on the axial length of the wearer's eye.
Dependencies are inferred from the claim text.