the present invention provides devices and methods for detecting and tracking fast - moving - object . in one application , the present invention can be employed to detect and track fast eye movements . an example device of the present invention tracks a moving object by generating , within a single frame of a detector two or more images of the moving object . the images are generated by illuminating the moving objects with sequentially activated light sources . the rate at which the light sources are sequentially activated exceeds the frame rate of the detector , resulting in generating multiple images of the moving object within a single frame of the detector . the devices and methods described herein , including a saccadometry system , can utilize off - the - shelf components and does not require expensive high - frame - rate video equipment . these devices and methods can be used to track a moving object with a temporal resolution far greater than that normally achievable with standard 15 fps to 30 fps frame - rate imagers .