Patent ID: 6134342
Filing Date: 2000-10-17
Classification: G01M

Abstract:
A method of inspecting the appearance of a contact lens in a contact lens container, comprising the steps of:filling a predetermined amount of preservation liquid into the contact lens container which does not contain the contact lens;using an imaging pick-up device to image the contact lens container holding the predetermined amount of preservation liquid to form mask image data including any defects of the contact lens container and/or debris present, the mask image data including data of mask area which covers an inspection area;inserting a contact lens into the contact lens container with the predetermined amount of preservation liquid;imaging the contact lens in the contact lens container with a predetermined amount of preservation liquid to obtain inspection image data, the inspection image data including data of the inspection area;processing said mask image data and said inspection image data to provide contact lens image data free of defect and/or debris data arising from the container holding the predetermined amount of preservation liquid, including subtracting the mask image data from the inspection data; anddetecting contact lens defects from the contact lens image data to complete the inspection of the appearance of the contact lens.