“…Research on developing eye trackers investigates reducing the cost of existing infrared-based trackers (e.g., Seeing Machines, n.d.; Tobii, n.d.) as well as increasing their accuracy. Researchers also worked on developing customized eye trackers for tasks that do not require precise x and y coordinates as input from the tracker (Dostal, Kristensson, & Quigley, 2013;Zhang, Bulling, & Gellersen, 2013). On a different set of applications, eye trackers often help individuals to design better billboards, traffic signs, and advertising posters through analysis of users' eye-gaze patterns (Donegan et al, 2009;Duchowski, 2007;Majaranta & Raiha, 2002).…”