Patent ID: 7628487

Claim:
A method of centering a target ophthalmic lens ( 11 , 12 ) of target eyeglasses ( 10 ) on a target frame ( 13 ) of the rimless type presenting a final outline ( 21 ) of known shape, with a bridge ( 14 ) and arms ( 15 , 16 ) fastened to the target lens at anchor points ( 17 , 18 , 19 , 20 ) defined relative to the final outline ( 21 ), the method comprising the steps of: a) fitting the wearer with presentation eyeglasses ( 30 ) comprising a presentation frame ( 33 ) identical to said target frame ( 13 ) and at least one presentation lens ( 31 , 32 ) associated with the same eye as said target lens; b) pointing out manually, or identifying automatically, on the presentation lens ( 31 , 32 ) the pupillary point (Pu 2 ) with which the pupil ( 50 ) of the corresponding eye ( 51 ) of the wearer is in register; c) measuring the pupillary height of the pupillary point (Pu 2 ) of the presentation lens ( 31 , 32 ); d) measuring the pupillary distance or half-distance (Eg, Ed) of the wearer; e) identifying the optical frame of reference of the target lens ( 11 , 12 ) and in particular the centering point (Pc 1 ) of the target lens ( 11 , 12 ) that is to come into register with the pupil ( 50 ) of the wearer when the wearer is wearing the target eyeglasses ( 10 ); f) transferring the pupillary height and the pupillary distance or half-distance onto the target lens ( 11 , 12 ) from said centering point (Pc 1 ) of the target lens ( 11 , 12 ); and g) deducing therefrom the centering position of the target lens ( 11 , 12 ) relative to the target frame ( 13 ), or vice versa; characterized in that, for the presentation lens ( 31 , 32 ) presenting an outline ( 41 ) of shape and/or position relative to the presentation frame differing from the shape and/or position intended for the final outline ( 21 ) of the target lens ( 11 , 12 ) after edging and mounting on the target frame, the following steps are performed: directly or indirectly measuring in step c), the height (h) of the pupillary point (Pu 2 ) of the presentation lens ( 31 , 32 ) in a frame of reference based on the presentation frame ( 33 ) and independent of the shape of the outline ( 41 ) of the presentation lens ( 31 , 32 ); and deducing, in step g), the centering position of the target lens ( 11 , 12 ) relative to the target frame ( 13 ), or vice versa, so that the centering point (Pc 1 ), in a frame of reference based on the target frame ( 13 ) corresponding to the frame of reference of the presentation frame ( 33 ), is situated at the same height (h) as the pupillary point (Pu 2 ) in the frame of reference of the presentation frame ( 33 ).