The eye-tracker device is mounted on the bottom of screens and responds to precise and subtle eye movements. The technology is less effective with users who wear glasses. (Product image via Tobii.com)

Sara McCaslin is an editor and visual journalist for The Seattle Globalist. She worked for several daily midwest newspapers including The Flint Journal, The Columbia Missourian and The Boone County Journal before moving to Seattle. Sara trains the next generation of journalists through the Globalist Apprenticeship Program and is a graduate of the Journalism School at the University of Missouri.