Viewing any kind of stereogram properly may cause the viewer to experience vergence-accommodation conflict. The 3D scene in an autostereogram is often unrecognizable until it is viewed properly, unlike typical stereograms. Autostereograms use only one image to accomplish the effect while normal stereograms require two. The top and bottom images produce a dent or projection depending on whether viewed with cross- ( ) or wall- ( ) eyed vergence.Īn autostereogram is a two-dimensional (2D) image that can create the optical illusion of a three-dimensional (3D) scene.
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