Abstract
In the interest of maintaining singular binocular vision, the external muscles of the eye can cooperate as an independent muscular synergy, so as to provide cyclotorsion of the 2 eyes about their visual axes, which may themselves remain fixed. These cyclo-fusional movements, a normal physiologic aspect of eye movement, together with a stable retinal correspondence can account for the more striking of Werner''s binocular depth contrast phenomena as shown by a series of expts. involving various degrees of declination of images introduced by -inclinations of lines from each other.

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