On a slightly different but related topic, check this out: from Alfred Yarbus, 'Eye movements and vision'. Springer; 2013 Nov 11. p.107 "The drift of the axes

On a slightly different but related topic, check this out: from Alfred Yarbus, 'Eye movements and vision'. Springer; 2013 Nov 11. p.107 "The drift of the axes of the eyes was first discovered, and on the whole correctly described, by Dodge (1907). He considered that there is no constant point of fixation and suggested the term 'fixation field." Subsequently, nearly all authors studying eye movements confirmed the presence of drifting movements of the eyes (Glezer and Tsukkerman, 1961)." I did a bit of work on a project that examined the difference between the way that artists and laymen look at images. For this we used eye trackers. This is where I first saw how restless normal eye movement is. The figures in that chapter and preceding it bear this out. So... attention drifts from one eye to the other, though one eye is dominant, and defines the 'pan' angle of the other. In addition, generally the eyes scan points within an object rather than look directly at the object as a whole. As someone who teaching drawing (and therefore perhaps analytical looking) this was an 'eye opener'. Edit: link to referenced book: http://wexler.free.fr/library/files/yarbus%20(1967)%20eye%20movements%20and%20vision.pdf http://wexler.free.fr/library/files/yarbus%20(1967)%20eye%20...