Editing Saccade (section)

==Function==
Humans and many organisms do not look at a scene in steadiness; instead, the eyes move around, locating interesting parts of the scene and building up a three-dimensional 'map' corresponding to the scene (as opposed to the graphical map of [[Bird vision|avians]], which often relies upon detection of angular movement on the retina).{{Citation needed|date=October 2016}}

When scanning immediate surroundings or reading, human eyes make saccadic movements and stop several times, moving very quickly between each stop. The speed of movement during each saccade cannot be controlled; the eyes move as fast as they are able.<ref>Neil R., Carlson, and Donald Heth C. "5." ''Psychology: the science of behaviour'', fourth Canadian edition. Toronto: Pearson, 2010. 140–141.</ref> One reason for the saccadic movement of the human eye is that the central part of the [[retina]]—known as the [[Fovea centralis|fovea]]—which provides the high-resolution portion of vision is very small in humans, only about 1&ndash;2 degrees of vision, but it plays a critical role in resolving objects.<ref>{{cite journal |doi=10.1016/j.preteyeres.2013.01.005|pmid=23500068|pmc=3658155|title=Adaptation of the central retina for high acuity vision: Cones, the fovea and the avascular zone|journal=Progress in Retinal and Eye Research|volume=35|pages=63–81|year=2013|last1=Provis|first1=Jan M|last2=Dubis|first2=Adam M|last3=Maddess|first3=Ted|last4=Carroll|first4=Joseph}}</ref> By moving the eye so that small parts of a scene can be sensed with greater [[Optical resolution|resolution]], body resources can be used more efficiently.{{how|date=February 2023}}