Shining eyes on the cat

Eyes that "light", this is only one way a cat to be able to see clearly at a low light. There are still many secrets of the mystery behind the vision capabilities of this special cat eyes. Cats are animals that tend to be much activity at night. Starting from the hunt, eat, even bermain.Agar cats can move freely at night, the cat must have the ability to detect an object or objects that become the target despite the dark surrounding environment.

Cat eyes capability with a special mechanism that owned cats eyes and some other nocturnal animalshave same eyes, will greatly help them to survive the night. They eyes only require 1/6 the power of light than human eyes. Part of the cat's eyes can dilate the pupil is called three times larger than the human eyes.

Cat's eyes consists of three main parts. The outermost layer is the tunica fibrosa. This layer is composed of elastic fibers and collagen fibers called the sclera. Sclera covers three quarters of the posterior part of the fibrous layer, the rest of the anterior part of the eye called the cornea include a quarter part of this layer.

The second layer of cat eyes is the tunica vascular. As the name suggests, This upper layer is composed of blood vessels That Provide oxygen supply and nutrients to eyes tissue. Eyes components that exist in this layer, which is most responsible for the clarity of cat eyes to the object is a lens. In this layer also be found pupil. Basically, the shape of the pupil is referred to as a round or circular. In bright light, the pupil will look smaller, on the contrary, in a little light, the pupil will look bigger. Dilated pupil condition that this is an attempt to obtain as much light.

Form pupil cat on a bright day will look like a straight line which extends vertically. In contrast, the human pupil and the animals are active during the day, will still look round even though its diameter becomes smaller. The advantage of the pupil cat that can turn into this flat is a cat can do a more accurate control to control how much light coming into her eyes.

The next layer of cat eyes is composed of the tunica nervosa lapisansel called retinal photoreceptors. These cells of cat eyes are capable of converting light into signals eletrokimia to then be transmitted to the nervous system. There are two types of photoreceptor cells are stem cells (rods) and cones (cones). Tapetum lucidum were behind the eyes called the retina. To be able cat's eyes to see an object, light entering the eyes of a cat must travel through parts of the eye that dimilikinya.Bahkan there are times when the light "walk" back and forth, to maximize the light received is when the cat's eyes in the dark place.

After light enters through the pupil, the light will be focused by the lens toward the retina, then the information is transmitted to the brain by the nerves of the eyes. Cone cells work well in bright light and serves to send detailed information received by the brain. While stem cells work well in low light level. These stem cells function in the detection of movement and dasarinformasi in visual form. A photosensitive pigment in selbatang called rhodopsin insensitive to light only on levelrendah. In the daytime, pigment will be split quickly, so the visual perception becomes less effective.

Retina in nocturnal animals is almost entirely composed of stem cells. Whereas other cell types are cone cells, almost nothing, or nothing at all. As a result most of the nocturnal animals such as cats do not have the ability to distinguish colors. At least there are cones in the retina that causes cats can also find out the location of objects in front of him clearly, though not able to see the details of the object being viewed.

In environments with low light levels, hard work can see eye to be assisted by the "bright carpet" tapetum lucidum. Like a mirror, tapetum reflects light that has previously been received through the retina, back to the retina a second time. In saattersebut, light was given a second chance to hit the stem cells in the retina are extremely sensitive to light and maximize the absorption of the received image information. In this second journey, the light is not absorbed, released back into the eyes through the pupil organ. That's why in places minimal lighting, cat's eye will look shiny.

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