Abstract: An ophthalmic lens scanner includes an inspection platform configured to receive an ophthalmic lens thereon. A camera is spaced apart from the inspection platform and is arranged to, in response to an activation signal, capture an image of the ophthalmic lens. A light source is spaced apart from the inspection platform and is configured to emit light when the camera is activated to capture an image of the ophthalmic lens. The inspection platform is located between the camera and the light source. A first Fresnel lens is located between the inspection platform and the camera. A second Fresnel lens is located between the inspection platform and the light source. The ophthalmic lens scanner may be incorporated in an ophthalmic lens scanner system that includes a computing device and a display device.

Abstract: An ophthalmic lens scanner includes an inspection platform configured to receive an ophthalmic lens thereon. A camera is spaced apart from the inspection platform and is arranged to, in response to an activation signal, capture an image of the ophthalmic lens. A light source is spaced apart from the inspection platform and is configured to emit light when the camera is activated to capture an image of the ophthalmic lens. The inspection platform is located between the camera and the light source. A first Fresnel lens is located between the inspection platform and the camera. A second Fresnel lens is located between the inspection platform and the light source. The ophthalmic lens scanner may be incorporated in an ophthalmic lens scanner system that includes a computing device and a display device.

Abstract: A method and system are provided for reliably detecting localized birefringence defects of an object such as an optical media substrate in a dynamic local birefringence field created during cooling of the optical media substrate at an inspection station. A birefringence digital filter filters out high frequency defect data while eliminating background birefringence data in a digital image created by a camera adapted to respond to the birefringence of the optical media substrate under control of a computer. Resulting filtered high frequency defect data is then processed to determine the localized birefringence defects in real-time. In one embodiment, the birefringence digital filter includes an addressable storage device such as a PROM which stores a lookup table which is able to produce filtered data in real-time at a data rate in excess of 8 million pixels per second.