Process of correction of the shift of the 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 the 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 the expected optical power corresponding to the optical power control command, wherein a temperature sensor is arranged in and/or on the phoropter to measure the temperature in the phoropter, wherein in a preliminary phase, a static curve or function of the actual optical power of at least one determined active lens as a function of measured temperatures is obtained for at least one constant value of optical power control command and in steady state condition, wherein in a further utilization phase of the phoropter, the current temperature is measured by the temperature sensor and the active lens receives 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, characterized in that, in the preliminary phase, a further dynamic curve or function of the actual optical power of the active lens as a function of the time is obtained 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 the start of the step of temperature change, and wherein in the further utilization phase of the phoropter, the active lens receives 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. wherein a temperature sensor is arranged in and/or on the phoropter to measure the temperature in the phoropter, wherein in a preliminary phase, a static curve or function of the actual optical power of at least one determined active lens as a function of measured temperatures is obtained for at least one constant value of optical power control command and in steady state condition, wherein in a further utilization phase of the phoropter, the current temperature is measured by the temperature sensor and the active lens receives 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, characterized in that, in the preliminary phase, a further dynamic curve or function of the actual optical power of the active lens as a function of the time is obtained 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 the start of the step of temperature change, and wherein in the further utilization phase of the phoropter, the active lens receives 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.