How can an owl see clearly at night?

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<blockquote><p><strong>How can an owl see clearly at night?</strong></p></blockquote>
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Owl and its vision at night

What is peculiar about owl is that they can see more clearly at night than during the day. In fact they come to life at night and are an apt example of nocturnal birds. Birds which can see more clearly at night rather than during the day are known as nocturnal birds. Light scattered by an object is focused on to the screen of the eyes by the lenses inside the eyes. This screen of the eyes is called the retina. An inverted image of the object is formed on the retina which is carried to the brain by optic nerves. This is erected by the brain and thus we see the object. The owls eyes have four special features due to which it can see more clearly at night.

Owl

Firstly the distance between the lens of its eye and the retina is more than the distance in the case of human eyes. Due to this the image formed on the retina is bigger in size. Secondly the number of rods and cones in the retina is very large almost 10,000 per sq mm compared to 2,000 per sq mm in our eyes. Thus the owl can see five times more than us. Thirdly its eyes have red coloured material chemically a protein which makes its eyes more sensitive to light. Fourthly the pupiles of its eyes can dilate more thus allowing even the smallest amount of light to enter into the eyes. Because of these four factors the owl can see more clearly in darkness. Due to the extreme sensitivity of their eyes to light objects appear too bright and uncomfortable to the eyes in the bright light of the day. Surprising enough an owl can rotate its head by 180 ie it can see at the back of his head.

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