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

Claim 4:
5. The process according to claim 4, wherein in the further utilization phase of the phoropter, the global function is defined relatively to a reference temperature Tref and to a related reference optical power Pref:

Pcurrent=Pref+α*(Tcurrent−Tref+γ*(TswitchOn−TlastSwitchOff)*e−(t/δ))

where Pcurrent is the actual optical power, α a sensitivity to the temperature, γ a temperature coefficient, δ a coefficient related to a dynamic of reactivity of a system, essentially related to the one of the liquids of the active lens, and TswitchOn the measured temperature when the phoropter was switched on and TlastSwitchOff the temperature when the phoropter was switched off for the last time.