Patent ID: 9743833
Date: 2017-08-29
CPC Classifications: A61B,G02C,G05B,Y02P

Claim:
1. A method for acquiring and computing geometrical data of at least one pattern associated with an ophthalmic object, such as a presentation lens, an ophthalmic lens or a template for manufacturing ophthalmic lenses similar to the object or complementary thereto, wherein a device for acquiring and computing geometrical data is used, said device comprising: a transparent support adapted for bearing an ophthalmic object; on one side of the support, means for illuminating this support: on the other side of the support, a video camera oriented towards the support and adapted for producing a video signal representative of at least one pattern associated with the ophthalmic object laid on the support; and signal processing and analysis means receiving as input the video signal produced by the camera, and adapted so as to compute and provide geometrical data intended for making the lens, and wherein: (a) a verification pattern independent of said geometrical data is traced on the ophthalmic object, this verification pattern being chiral, wherein the verification pattern has no symmetry around any axis; (b) the ophthalmic object is positioned on the transparent support of the acquisition and display device; (c) by means of said device, said verification pattern is optically captured and analyzed; and (d) from the analysis of the verification pattern, the face of the ophthalmic object on which rests the ophthalmic object positioned on the support is determined.