US 11,944,381 B2
Process of correction of the shift due to temperature of the optical power of an active lens of a phoropter and related phoropter and optometry system
Didier Grand-Clement, Charenton-le-Pont (FR); Philippe Pinault, Charenton-le-Pont (FR); and Yones Sidiq de Labrusse, Toulouse (FR)
Assigned to Essilor International, Charenton-le-Pont (FR)
Appl. No. 17/295,363
Filed by Essilor International, Charenton-le-Pont (FR)
PCT Filed Nov. 20, 2018, PCT No. PCT/IB2018/001446
§ 371(c)(1), (2) Date May 19, 2021,
PCT Pub. No. WO2020/104826, PCT Pub. Date May 28, 2020.
Prior Publication US 2022/0015623 A1, Jan. 20, 2022
Int. Cl. A61B 3/028 (2006.01); A61B 3/00 (2006.01); G02B 3/14 (2006.01); G02B 7/02 (2021.01)
CPC A61B 3/0285 (2013.01) [A61B 3/0016 (2013.01); G02B 3/14 (2013.01); G02B 7/028 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A process of correction of a shift of an optical power of an active lens in a phoropter due to a temperature change over time, the active lens comprising a container filled with a liquid and having a deformable curvature membrane under an action of an actuator controlled by an optical power control command, the shift being that the active lens provides an actual optical power that is different from an expected optical power corresponding to the optical power control command, the process comprising:
measuring, using a temperature sensor arranged in and/or on the phoropter, the temperature in the phoropter;
obtaining, in a preliminary phase, a static curve or function of the actual optical power of the active lens as a function of measured temperatures for at least one constant value of optical power control command and in steady state condition;
in a further utilization phase of the phoropter, measuring a current temperature by the temperature sensor, and receiving, by the active lens, an optical power control command that is corrected using the static curve or function of the actual optical power of the active lens to bring back the actual optical power equal to the expected optical power; and
obtaining, in the preliminary phase, a further dynamic curve or function of the actual optical power of the active lens as a function of a time for at least one constant value of optical power control command and for at least one defined step of temperature change, the actual optical power becoming constant after a settle time as from a start of the step of temperature change, and, in the further utilization phase of the phoropter, the active lens receiving an optical power control command that is further corrected using the dynamic curve or function of the actual optical power of the active lens to bring back the actual optical power equal to the expected optical power.