| 摘要 |
<p>A method for determining the shape of the bevel of an ophthalmic lens so as to have the ophthalmic lens fit a given spectacle frame, the method comprising the steps of:
€¢ providing the three-dimensional (xi, yi, zi) internal profile of the groove of at least a rim of the spectacle frame expressed in the principal axes (Xf, Yf, Zf) of the spectacle frame and the length Pf of the periphery of the groove of the rim,
€¢ providing the blocking point of the ophthalmic lens and the horizontal direction X1 of the ophthalmic lens,
€¢ projecting the three-dimensional (xi, yi, zi) internal profile of the groove of the rim on the front face surface of the ophthalmic lens so as to obtain a three-dimension projected groove shape (xp, yp, zp),
€¢ modifying the coordinates of each point of the two-dimensional groove shape (xp, yp) based on two correction coefficient, Rx for the coordinate xp and Ry for the coordinate yp, with Rx+Ry= 1 so as to have the length Pp of the three-dimensional groove projected shape (xp, yp, zp) equal to the length Pf of the periphery of the internal profile of the groove of the rim.</p> |
