Beware of the straight-ahead shift--a nonperceptual change in experiments on adaptation to displaced vision.
D000221:Adaptation, Ocular; D003951:Diagnostic Errors; D005556:Form Perception; D006801:Humans; D007088:Illusions; D055095:Optics and Photonics; D011434:Proprioception; D014787:Vision Tests; D014796:Visual Perception