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 Silence The Eye of Silence The Eye of Silence (), 1943–44, is a painting by German dadaist and surrealist Max Ernst. For "The Eye of Silence" Ernst employed a technique called decalcomania to create arbitrary textures on the canvas, which he then reworked to resemble rock formations and forms of animals, plants, and architecture. The imagery on the surrealist canvas has been described as a primordial-like landscape, "in which rock-hard and gelatinous formations coexist under a forbidding sky." "The Eye of Silence" has also been described as, "part vegetation, part rock and part bejewelled baroque palace. A fusion of animal, mineral