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<p>points in space.</p>

<p>As other quantities that describe the functional principles of the visual system, it is possible  to provide a theoretical description of the phenomenon.  The measurement with psycho-physical experiments usually provide an empirical definition that slightly deviates from the theoretical one. The underlying theory is that this deviation represents an adaptation of the visual system to the regularities that can be encountered in natural environments.</p>

<p><big> History of the term </big></p>
<p>The horopter as a special set of</p><p>
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