Alcon Inc.
METHOD FOR PROVIDING A MALE MOLD HALF FOR MOLDING A TORIC OPHTHALMIC LENS AT A PREDETERMINED TARGET ROTATIONAL ORIENTATION

Abstract:

A method of providing a male mold half (1) for molding a toric contact lens at a predetermined target rotational orientation is disclosed. The male mold half comprises a front face (10) having a toric convex lens-forming surface (100) and a rear face (11) The method comprises the steps of: providing the male mold half (1) at a predetermined rotational orientation (PROM), picking the male mold half (1) up with a gripper (5) having a central axis (55), rotating the gripper (5) with the male mold half (1) about the central axis (55) of the gripper (5) by a predetermined rotational angle (.alpha.) towards the predetermined target rotational orientation (TROM), and releasing the rotated male mold half (1) from the gripper (5). Prior to picking the male mold half (1) up, the method comprises centering the gripper (5) and the male mold half (1) relative to each other such that the central axis (55) of the gripper and a central axis (113) of the male mold (1) half coincide.