The face of a human subject (16) is alternately illuminated by first and second sources of active illumination (28, 30) disposed above and below a video camera (32) that captures images of the subject's face. Glare due to reflection of the active illumination from eyeglasses (24) worn by the subject (16) shifts up or down from one image to the next due to the different locations of the first and second sources (28, 30). Eye detection and tracking routines (50, 52) ignore images in which the eye (22) is occluded by eyeglass glare so that the glare does not interfere with the performance of the routines.
