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A user interface device (105) comprising a camera (110, 205) that captures an image of a user's (115) face and fingers (125) and a processor (210, 230) that determines the spatial location of the user's (115) farcical features (120) and fingers (125) using the captured image, in which the processor (210, 230) further determines where on a screen (130) of the user interface device (105) the user (115) is viewing and in which the processor (210, 230) monitors the user's (115) facial features (120) and fingers (125) for indications of manipulation of on-screen content of the user interface device (105).