Two eyes can measure relative distance to scene point, using geometric triangulation {triangulation, eye}. See Figure 1.
comparison
Comparing triangulations from two different distances does not give more information. See Figure 2.
movement
Moving eye sideways while tracking scene point can calculate distance from eye to point, using triangulation. See Figure 3.
Moving eye sideways while tracking scene points calibrates distances, because other scene points travel across retina. See Figure 4.
Moving eye from looking at object edge to looking at object middle can determine scene-point distance. See Figure 5.
Moving eye from looking at object edge to looking at object other edge at same distance can determine scene-point distance. See Figure 6.
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Date Modified: 2022.0224