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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: J Vis. 2008 Mar 28;8(3):33.1–3330. doi: 10.1167/8.3.33

Figure 1.

Figure 1

Vergence and focal distance with real stimuli and stimuli presented on conventional 3D displays. (A) The viewer is fixated and focused on the vertex of a hinge. Vergence distance is the distance to the vertex. Vergence response is the distance to the intersection of the eyes’ lines of sight. Focal distance is the distance to which the eye would have to focus to create a sharply focused image. Accommodative response is the distance to which the eye is accommodated. (B) The viewer is fixated on the simulated hinge vertex on a computer display screen. Vergence distance is the same as in panel A. Focal distance is now the distance to the display. (C) The appearance of the stimulus when the viewer is accommodated to the vertex of a real hinge. In the retinal image, the joined planes (the sides) of the hinge are blurred relative to the vertex. (D) Appearance when the viewer is accommodated to the vertex of a simulated hinge. The sides and the vertex are equally sharp in the retinal image.