The structure of eyes at a cat has the features. All breeders of these capricious and proud animals need to know features of life of cats and the rule of care for them. The most unprotected cat's body is an eye therefore cat's eye care has to be special.
As well as all other animals, a cat need the second eyelid to clean the surface of eyes from dust, litter, pollution. It also call an internal eyelid of a cat. Also humidify with the second age of a cat the surface of eyes and wash out eyes. An internal eyelid of a cat rather big, it completely covers the surface of an eye when the cat sleeps, creating additional protection.
The structure of an internal (second) century at a cat
The second eyelid of a cat is also called a blink membrane which represents the thinnest fold of a conjunctiva. It is located directly on an eyeball body in a medial corner. On the one hand the fold of a conjunctiva covers inside of external eyelids, with another – already directly cornea of an eye of a cat. Thus, the fold carries out protection of both an external age of a cat, and the surface of an eye.
In a bulbar surface of a fold of a conjunctiva there are sites of lymphoid follicles rather dense to the touch. These follicles are in dense contact with the surface of an eye of a cat. Here also the plaintive film of a cat's eye is located. These structures perform functions of lymph nodes of a cat's eye, continuously protecting it from hit of litter, small garbage, dirt and dust.
Exact functions of an internal (second) century at a cat
Exact functions of the second century at a cat still are completely not investigated by scientists. Researches are conducted already long time, and constantly scientific some new nuances of this body open. It is considered to be that the internal eyelid of a cat protects a thin and gentle cornea from multiple injuries which would occur at movements of a cat through bushes and a high grass and also during hunting. Even at emergence of insignificant damages of a surface of a century or a cornea the fold of a conjunctiva washes out and heals these damages without fate of the cat. Existence of appendages of plaintive glands in it gives the chance to continuously make the increased amount of plaintive liquid which washes out the surface of eyes, unlike primacies. Internal eyelid of a cat provides additional immunological protection against various pathogenic bacteria and fungi which in large quantities live on the surface of an eye at the cat family. Due to these features of the structure of an eye, cats perfectly see in complete darkness what allows them to hunt even at night.