“…In early studies, “microsaccade” referred to extremely small (less than 10–12 arc min, 0.16–0.20°) binocular eye movements and debate concentrated on whether these served any unique purpose for vision (Collewijn & Kowler, 2008; Hafed, 2011). However, the accepted definitional size of a microsaccade has increased (Martinez-Conde et al, 2009, 2013), such that microsaccades are now generally viewed as sitting at the small amplitude end of a microsaccade-saccade continuum (Ko et al, 2010; Martinez-Conde et al, 2013; Otero-Millan, Macknik, et al, 2013; Otero-Millan, Schneider, et al, 2013). For an alternative opinion see Collewijn and Kowler (2008).…”