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<p><strong>Miosis</strong> is a medical term for constriction of the <a title="Pupil" href="http://en.wikipedia.org/wiki/Pupil">pupil</a>. It is the opposite of <a title="Mydriasis" href="http://en.wikipedia.org/wiki/Mydriasis">mydriasis</a>. It is seen in a variety of medical conditions, and can also be caused by certain drugs and chemicals. Eye drops used to intentionally cause miosis are known as &quot;miotics&quot;. Extreme miosis is commonly called &quot;pinpoint pupils&quot;, a situation that can be caused by use of opiates.</p>

<p><a id="Physiology_of_the_photomotor_reflex" name="Physiology_of_the_photomotor_reflex"></a></p>

<h2><span class="mw-headline">Physiology of the photomotor reflex</span></h2>