Why they see in the dark?

The cats can fail to see pitch blackness, but they have a better visual perception in the semidarkness than the human being or another animals. This ability is due to the cat's ocular especial anatomy.

In relation to the size of his head, the cat has the extremely big eyes. The eye's surface ( the cornea ) is very curved ( convex ) that enables the bigger penetration of possible light. The cat can open its iris ( the portion colored of his eye ) very largely to enable a bigger entrance of light. When luminosity is intense it can be noticed that the pupil is a fine line, because you find yourself contracted by the excess of light, the pupil will go away delaying as luminosity diminish, taking more time to the full in the semidarkness to allow in the scarce existent light at that point, but with that little bit of light and it will enable his anatomic characteristics of his ocular appliance forming the image in his retina and seeing in semidarkness. An animal's retina ( the eye's back where the image is formed ) is compound largely for two types of light-sensitive so-called cells walking canes and cones. Walking canes are responsible to increase the power of the radiant small stimuli. The cat has a large number of walking canes. Relating to the humans, you have these for each 5 light-sensitive cells, 4 are walking canes, in the same surface that in the man the relation in the cat comes from 25 walking canes to 26 light-sensitive cells in its retina. The cats also have a reflexive developed area in the back of his so-called eyes tapetum lucidum, this what you do is its eyes shine in the evening when they are focused by them an automobile's lighthouses.

Source: Web Gatos Mascotia

 

 

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