The PureCel®Plus architecture also utilizes thicker silicon to improve quantum efficiency when capturing images using near-infrared light outside the visible spectrum. This is accomplished with only 1.3MP, which is a quarter of the OV5678 sensor's full resolution. This IR performance enables machine vision applications such as Windows Hello facial authentication. It can also be used to perform eye tracking for reduced power consumption when the user is not viewing the screen. Eye tracking can also enable user warnings about eye fatigue from looking at the screen for an extended period of time.