Eye tracking white sclera (limbus tracking). It presents another challenge for vertical eye movements due to obstruction of eyelids. Eye-tracking setups vary greatly: some are head-mounted, some require the head to be stable (for example, with a chin rest), and some function remotely and automatically track the head during motion. Most use a sampling rate of at least 30 Hz. Although 50/60 Hz is more common, today many video-based eye trackers run at 240, 350 or even 1000/1250 Hz, speeds needed in order to capture fixational eye movements or correctly measure saccade dynamics. Eye movements are typically divided into fixations and saccades
The Eye of the Giant wasteland as the Constitution begins to warp into a monstrous living being. The contents of the ampoule have merged Nancy, Brokk's eye, and the organic components of the ship itself into a voracious living entity, part animal, part vegetable, and part mineral; the transition has driven the new entity insane, and it will consume all life on Earth. The Doctor is unable to fight this new life form, and when Liz and Osgood try to cut it to pieces using the time bridge, the pieces reconstitute on the other side and attack them. They are forced to flee beyond the