METHOD FOR THE DETERMINATION OF A PROGRESSIVE OPHTHALMIC LENS

摘要

A method for the determination of a progressive ophthalmic lens for a give n wearer comprises the stages 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 axi al length of the wearer's eye. - calculating the power required on the lens for each direction of viewing b y successive iterations in order to obtain the target power defect and the target resulting astigmatism.