Patent ID: 8747187

Claim:
A method of shaping an ophthalmic lens ( 10 ) for eyeglasses to have a desired outline ( 11 ) by means of a machining device ( 200 ) including a blocking support ( 210 ) for the ophthalmic lens ( 10 ) and at least one first machining tool ( 220 ) that is rotatable about a first axis (A 3 ) that is movable relative to the blocking support ( 210 ), the method comprising the steps of: a) obtaining an inner cutting limit ( 12 ) of said first machining tool ( 220 ), defined in a frame of reference of the machining device ( 200 ); b) defining an initial blocking position (P 1 ) for the ophthalmic lens ( 10 ) and its desired outline ( 11 ) on the blocking support ( 210 ) in the frame of reference of the machining device ( 200 ); c) calculating whether at least a fraction of the desired outline ( 11 ), when positioned using the initial blocking position (P 1 ), presents a non-zero intersection (Q 21 -Q 22 ) with said inner cutting limit ( 12 ); d) defining as a final blocking position (P F ), either the initial blocking position (P 1 ) without change if the intersection calculated in step c) is zero, or else, a blocking position that is modified relative to the initial blocking position (P 1 ) so that the desired outline ( 11 ) as repositioned to the modified blocking position does not present any intersection with the inner cutting limit ( 12 ) associated with the first tool; e) blocking the ophthalmic lens ( 10 ) on the blocking support ( 210 ) in the final blocking position (P F ); and f) shaping the ophthalmic lens ( 10 ) with the desired outline ( 11 ) using at least the first machining tool ( 220 ).