Patent ID: 8300983

Claim:
A method of determining the position of a target drill hole ( 210 ; 250 ) to be drilled in a target corrective lens ( 200 ) having an expected target outline ( 220 ) after shaping, the position being determined from a reference lens ( 100 ) that presents a reference outline ( 120 ) and at least one reference drill hole ( 110 ; 150 ), the method comprising the following steps: acquiring an image of the reference lens ( 100 ) in an acquisition plane (P 1 ; P 2 ), in particular including an image of its reference outline ( 120 ) and an image of its reference drill hole ( 110 ; 150 ); deducing therefrom the position relative to the target outline ( 220 ) of the target drilling point (C 10 ; C 15 ) for a target drill hole ( 210 ; 250 ) of the target corrective lens ( 200 ); the method being characterized in that it further comprises the following steps: acquiring at least one characteristic (ALPHA 100 ; ALPHA 150 ) of the curvature of the reference lens ( 100 ); determining, in the acquisition plane (P 1 ; P 2 ), the reference distance in projection (R 1 ; R 4 ) between the projection (MO 1 ; MC 1 ) of a reference anchor point (O 1 ; C 1 ) of the reference lens ( 100 ), this reference anchor point being associated with the reference outline ( 120 ), and the projection (MC 1 ; MC 5 ) of a reference drilling point (C 1 ; C 5 ) of the reference drill hole ( 110 ; 150 ); calculating the three-dimensional reference distance (R 2 ; R 5 ) between the reference anchor point (O 1 ; C 1 ) of the reference lens ( 100 ) and the reference drilling point (C 1 ; C 5 ) of the reference drill hole ( 110 ; 150 ) as a function of said characteristic (ALPHA 100 ; ALPHA 150 ) of the curvature of the reference lens ( 100 ) and of the determined reference distance (R 1 ; R 4 ) in projection; and determining the position of the target drilling point (C 10 ; C 15 ) for the target drill hole ( 210 ; 250 ) of the target corrective lens ( 200 ) as a function of the calculated three-dimensional reference distance (R 2 ; R 5 ).