Patent ID: 7742158

Claim:
A method of measuring at least one refractive characteristic of a lens (L) at at least one specific measurement point of said lens by measuring deflection, the method comprising: generating a collimated light beam ( 28 ) directed towards the lens (L); detaching a localized group of at least three non-coplanar light rays ( 35 ) from the light beam ( 28 ), these light rays being grouped together about a measurement axis ( 37 ) in a measurement cylinder of a section that is substantially smaller than that of the lens (L) under measurement; measuring the deflection imparted by the lens (L) on the light rays; and deducing therefrom a value of the refractive characteristic of the lens (L) at the measurement point; wherein the lens (L) under measurement remains stationary relative to the light beam, and a position of the measurement axis ( 37 ) is variable from one measurement to another in order to be adapted to a position of the measurement point.