Patent ID: 7876428
Filing Date: 2011-01-25
Classification: G01M

Abstract:
1. A method of measuring a local power of an ophthalmic lens at a measurement point, comprising a step of contactless optical measuring of a local value of a position of a focus of said lens at said measurement point of said lens, this step of contactless optical measuring, comprising: overall optical measuring during which local values of the position of the focus of the lens are measured at a plurality of local zones around a plurality of points of the lens, including the measurement point in question and other points; selecting the measurement point desired for the lens; and deducing the local value of the position of the focus at said measurement point of the lens from the overall measurement, the method further comprising at least one step of determining an axial position of said measurement point on one of faces of the lens by feeling the face concerned with a means for feeling, and one step of combining the axial position of the measurement point as obtained with the local value of the position of the focus of the lens at the measurement point as determined from the contactless optical measurement, in order to deduce at least one vertex optical power of the lens at the measurement point.