Extraction opening position and/or transversal dimension determining device for ophthalmic lens of spectacles, has processing system determining position or transversal dimension of opening corresponding to required transversal dimension

摘要

The device has an acquisition device (53) e.g. camera, for capturing an image set of an extraction opening (110) of an ophthalmic lens (100) along a lighting direction (D51, A52) or capturing an image (A53). A processing system (54) processes the image when the lens is carried by a support (55), and determines a center position of a mouth of the opening from the image set of the opening and/or transversal dimension of the mouth of the opening corresponding to a required transversal dimension, where the mouth emerges on front surface (98) of the lens.