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More than 9,500 years of a cat live near the person. And still they fascinate us by the independence, wisdom, mystery. Their look full of mysterious fire is especially beautiful.
In the nature of a cat hunt mainly at night. And in order that they could see well "victim", the nature awarded them huge, concerning the trunk sizes, with eyes. Therefore they and are allocated on a muzzle of the house favourite.
For protection against potential damage eyeballs of a cat are located in a cranium much more deeply, than at other representatives of mammals. It limits their mobility. And in order that it is good to make out a moving subject the animal is forced to turn the head in his party.
The three-dimensional sight at cats is connected with arrangement of eyes on a front part of the head. At the same time a viewing angle makes 270 degrees (for comparison at the person no more than 180) and provides them panoramic sight. Ability to control a look big space and to catch any movement got to cats from wild ancestors – game hunters. In the central part of the picture the animal sees everything very accurately and clearly, and is sideways capable to record only moving objects.
Cats behind a mesh cover of an eyeball have a special layer – тапетум. It reflects rays of light and directs their not a retina. Thanks to it the twilight sight at night predators is several times better, than at the person.
With tapetumy also one more feature of eyes of representatives of the cat family is connected – to sparkle at very dim light. In complete darkness this gloss is absent as rays of light do not come to eyes of animals and, respectively, there cannot be their reflection.
At the majority of cats light reflected tapetumy has green or yellow color, but it can sometimes be and red.
All moving objects of a cat distinguish quicker than the person. The person is capable to perceive 24 frames per second. This standard is also used in television. Cat's see our telecasts as slowly changing slides. Especially well animals perceive the objects moving in the horizontal plane and it is slightly worse – in vertical.
The sight of cats differs in far-sightedness. The cat is capable to notice a moving object already from 800 meters. At distance to 7 meters of a cat see rather accurately, and here everything that is closer than the 1st meter – vaguely. The best focusing of sight is noted at them within 2-6 meters to an object. It is important for an exact jump during hunting.
The cat sees all objects volume, in accuracy, as well as the person. Neither fishes, nor birds have no binocular sight. At them from each eye the image is transferred to a brain separately. As a result it is difficult to them to calculate precisely distance to observed objects. The cat makes it with ease as both of her eyes at the same time fix an object and transfer this information to a brain where the volume image is created.
The high visual acuity is necessary for representatives of cat's for successful hunting. It is influenced by several factors:
The third eyelid is the mucous fold in an eye corner having the form of a half moon and completely covering a cornea. It carries out tasks:
Vertical slit-like pupils allow cats not to grow blind on bright sunlight and with success to hunt small rodents day at night. According to veterinarians, such form of a pupil allows an animal to estimate more precisely distance before production and to count jump force.