Patent ID: 11944381
Assignee: ESSILOR INTERNATIONAL
Field: Optics (Instruments)
Classification: CPC A  G | IPC A  G

Claim 7:
8. An optometry system comprising:
a phoropter comprising at least one active lens, 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; and
processing circuitry configured to
measure, using a temperature sensor arranged in and/or on the phoropter, temperature in the phoropter,
obtain, 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,
measure, in a further utilization phase of the phoropter, a current temperature by the temperature sensor, the active lens receiving 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 an expected optical power, and
obtain, 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.