Patent ID: 8953176
Filing Date: 2015-02-10
Classification: G01B,G01M

Abstract:
1. A method for measuring an un-hydrated ophthalmic lens comprising: providing an apparatus for measuring said un-hydrated ophthalmic lens including a displacement sensor having a laser source capable of generating a laser beam, an objective lens for focusing said laser beam, an oscillator for oscillating the objective lens, and a camera for determining a relative sharpness of a focal point of the laser beam; positioning a forming optic mandrel having a convex surface in the path of the laser beam; obtaining a reference measurement of the shape of the optic mandrel using the apparatus for measuring; forming the un-hydrated ophthalmic optic lens on the convex surface of the optic mandrel; positioning the forming optic mandrel and formed ophthalmic lens in the path of the laser beam; measuring the optic mandrel with the formed ophthalmic lens using the apparatus for measuring; and calculating an axial thickness of the ophthalmic lens by comparing the reference measurement to the measurement of the optic mandrel with the formed ophthalmic lens.