US 12,265,281 B2
Head freedom area of an optical lens
Isabelle Poulain, Charenton-le-Pont (FR); Guillaume Giraudet, Charenton-le-Pont (FR); Laurent Calixte, Charenton-le-Pont (FR); Alain Goulet, Charenton-le-Pont (FR); and Sébastien Fricker, Charenton-le-Pont (FR)
Assigned to Essilor International, Charenton-le-Pont (FR)
Appl. No. 17/621,344
Filed by Essilor International, Charenton-le-Pont (FR)
PCT Filed Jun. 25, 2020, PCT No. PCT/EP2020/067877
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2020/260481, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 19305852 (EP), filed on Jun. 26, 2019.
Prior Publication US 2022/0373823 A1, Nov. 24, 2022
Int. Cl. G02C 7/02 (2006.01); G02C 7/06 (2006.01)
CPC G02C 7/027 (2013.01) [G02C 7/066 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A device for determining a head freedom area of an optical lens adapted for a wearer looking at a specific point in a scene through the optical lens, comprising:
at least one input adapted to:
obtain optical lens data representing optical features of an optical lens,
obtain wearing data and fitting data representative of wearing conditions and fitting parameters of the optical lens, and
obtain a specific threshold value for an optical performance criterion; and
at least one processor configured to:
determine the head freedom area that corresponds to head positions of the wearer that provide optical performances greater than or equal to the specific threshold value when the wearer is wearing the optical lens in given wearing conditions upon given fitting parameters and looking at the specific point in the scene through the optical lens.