Aniseikonia: the Achilles heel of the classical theory of vision.
D000839:Aniseikonia; D003216:Conditioning, Operant; D003463:Cues; D003867:Depth Perception; D005123:Eye / Q000033:anatomy & histology; D005403:Fixation, Ocular; D006801:Humans; D007858:Learning; D009949:Orientation; D012054:Reinforcement, Psychology; D012160:Retina; D013997:Time Factors; D014785:Vision, Ocular; D014796:Visual Perception