Abstract: A method for inspecting an ophthalmic lens for the presence of an unacceptable semi-opaque defect in a lens body thereof comprises the steps of: illuminating the lens body with laser light in an area bounded by an edge of the lens body; detecting the intensity of laser light scattered by the illuminated lens body in a predetermined detection direction which is different from a direction of reflection; comparing the detected intensity of the scattered laser light with a predetermined threshold intensity; determining a size of at least one coherent area in which the detected intensity of the scattered laser light is higher than the predetermined threshold intensity; determining whether the size of the at least one coherent area is larger than a predetermined threshold size, and rejecting the ophthalmic lens in case the size of the at least one coherent area is larger than the predetermined threshold size.

Abstract: A method for generating a dark-field inspection image of an ophthalmic lens includes acquiring at least a first dark-field image, a second dark-field image, and a third dark-field image of the ophthalmic lens, determining a brightness value of each pixel of the at least first, second, and third dark-field images, comparing the determined brightness value of each corresponding pixel of the at least first, second, and third dark-field images and determining for each of the corresponding pixels a lowest brightness value, and generating the dark-field inspection image by setting the brightness value of a pixel of the dark-field inspection image to a brightness value representative of a dark pixel in case the determined lowest brightness value is representative of a dark pixel, otherwise setting the brightness value of the pixel of the dark-field inspection image to a brightness value representative of a bright pixel.

Abstract: A method for inspecting an ophthalmic lens for the presence of an unacceptable semi-opaque defect in a lens body thereof comprises the steps of: illuminating the lens body with laser light in an area bounded by an edge of the lens body; detecting the intensity of laser light scattered by the illuminated lens body in a predetermined detection direction which is different from a direction of reflection; comparing the detected intensity of the scattered laser light with a predetermined threshold intensity; determining a size of at least one coherent area in which the detected intensity of the scattered laser light is higher than the predetermined threshold intensity; determining whether the size of the at least one coherent area is larger than a predetermined threshold size, and rejecting the ophthalmic lens in case the size of the at least one coherent area is larger than the predetermined threshold size.