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. Author manuscript; available in PMC: 2013 Mar 6.
Published in final edited form as: Curr Biol. 2012 Feb 9;22(5):426–431. doi: 10.1016/j.cub.2012.01.033

Figure 1.

Figure 1

Geometry of disparity and blur. A. Two eyes separated by interocular distance I fixate at a distance z0. The object at distance z1 projects to locations indicated by XL and XR on the two retinas. Disparity is XL - XR. B. An eye is focused at distance z0. Objects at other distances will be blurred on the retina. The object at distance z1 is blurred over a circular region with diameter c. The edges of the blur circle are geometrically analogous to the projections of z1 on the two retinas in A. C. Side view of a person fixating and focusing at an object at distance z0 while reaching for another object at distance z1. D. Cross-fusable stereo pair of the observer’s point of view in C. 3D models for C and D were created with AutoDesk Maya, using objects from [18] and The Andy Rig (http://studentpages.scad.edu/~jdoubl20/rigsScripts.html).