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 Mind's Eye & Mission of the Viyrans husband are causing problems to her domestic bliss. This story leads directly into the audio drama "The Bride of Peladon". The hallucinogenic plants in this story reappear in "Brotherhood of the Daleks". Mission of the Viyrans is a Big Finish Productions audio drama based on the long-running British science fiction television series "Doctor Who". It is a one-part story written by Nicholas Briggs and was released alongside a three-part story, "The Mind's Eye". The Doctor and Peri encounter the time travelling Viyrans on a holiday planet. "Mission of the Viyrans" completes the "Virus Strand" story arc, which also includes the