 For very distant object points, the eyes will be looking along essentially the same line of sight.For very near objects, the eyes may become excessively "cross-eyed".However, for scenes in the greater portion of the field of view, a realistic image is readily achieved by superposition of the left and right images (using the polarization method or synchronized shutter-lens method) provided the viewer is not too near the screen and the left and right images are correctly positioned on the screen.