OPHTHALMIC LENS DESIGNING DEVICE AND OPHTHALMIC LENS DESIGNING METHOD

摘要

A method for designing an ophthalmic lens includes establishing a B-spline curved surface of the ophthalmic lens. A merit function is established according to a preset dioptric power distribution on the target curved surface and a curvature distribution corresponding to the preset dioptric power distribution. A plurality of control points of the B-spline curved surface is selected. Coordinates of all the selected control points are substituted into the merit function, and a value of the merit function is calculated. Whether the calculated value is less than or equal to a preset value is determined. If yes, the optimized B-spline curved surface is determined as representing the target curved surface. Otherwise, at least one selected control point is moved to optimize the B-spline curved surface.