Accommodation (Stereoscopic)

The ability of our eyes to refocus onto a new point of interest. In normal vision, the processes of focusing on objects at different distances (accommodation) and convergence/divergence (the angle between the lines of sight of our eyes) are linked by muscle reflex. A change in one creates a complementary change in the other. However, watching a stereoscopic film or TV program requires the viewer to break the link between these different processes by accommodating at a fixed distance (the screen) while dynamically varying eye convergence and divergence (something we don’t do in life and can quickly lead to headaches if over-used in stereo3D) to view objects at different stereoscopic distances.