"Unlike human eyes, which work best in daylight, the cat’s eyes must function well in extremely low light conditions and as such are well suited to an animal that is predominantly nocturnal and crepuscular in activity. In darkness, cats' eyes are able to function in approximately one-sixth of the light needed for human vision. However, they must also be able to function well in daylight – so just how is this achieved?  In low light levels the cat's pupil must be able to open as wide as possible, but also be able to contract to very small size to protect the sensitive retina in bright sunlight. In human eyes, this size variation of the pupil is controlled by a circular ciliary muscle, but this limits the amount of size variation. In cats however, the same process is controlled by two, shutterlike ciliary muscles, which gives the cat its characteristic slitlike pupil in bright light conditions. "
<ul><li><a href="//commons.wikimedia.org/wiki/File:Olhos_de_um_gato-2.jpg" title="File:Olhos de um gato-2.jpg">Olhos_de_um_gato-2.jpg</a>: *<a href="//commons.wikimedia.org/wiki/File:Olhos_de_um_gato.jpg" title="File:Olhos de um gato.jpg">Olhos_de_um_gato.jpg</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/71865026@N00">Mark Sebastian</a> from San Jose</li>
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