Method for shaping an ophthalmic lens for eyeglasses

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 (A3) 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 (P1) 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 (P1), presents a non-zero intersection (Q21-Q22) with said inner cutting limit (12);
• d) defining as a final blocking position (PF), either the initial blocking position (P1) 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 (P1) 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 (PF);
• and
• f) shaping the ophthalmic lens (10) with the desired outline (11) using at least the first machining tool (220).