Patent ID: 8632177
Filing Date: 2014-01-21
Classification: G02C

Abstract:
1. A progressive addition lens manufacturing method, comprising: providing an order request comprising at least the wearer prescription, determining the design and optical parameters of at least one progressive addition lens according to the wearer data, determining the value of the inset of at least one progressive addition lens to be placed before a wearer's eye in a given spectacle frame, manufacturing at least one progressive addition lens having the determined inset and the calculated design and optical parameters, wherein the value of the inset of a progressive addition lens is determined using a determination method implemented by computer means, the determination method comprising: providing convergence data, determining from the convergence data the inset of the progressive addition lens considering at least the convergence data, the prismatic effect of the progressive addition lens and at least one criteria in the list consisting of: the monocular pupillary distance of the wearer's eye in far vision, the distance between the center of rotation and the cornea of the wearer's eye, the distance between the cornea of the wearer's eye and a plan defined for the measurement of the monocular pupillary distance, the distance between the cornea of the wearer's eye and the lens at the level of the fitting cross of the progressive addition lens when the wearer is wearing the lens in the given spectacle frame, and the thickness of the progressive addition lens at the prism reference point, and wherein the right inset (I where EP r and EP l are the monocular pupillary distance of right and left eyes of the wearer in far vision, with ΔEP CC DVO_MES DVO DVO e f is, for each of the left and right eyes and lenses, a function of: the distance between the centre of rotation and the cornea of the eye, the distance between the cornea of the eye and the lens at the level of the fitting cross of the progressive addition lens when the wearer is wearing the lens in the given spectacle frame, the thickness e the progression length LP the pantoscopic angle T g is, for each of the left and right eyes and lenses, a function of: the value of the base B the index n the value of the parameter P C is a parameter, its value is comprised between −0.5 and −0.05; and G