Sense organs of cats have characteristics that allow it to be excellent hunters.
Other mammals don’t have sharpened vision, nor the possibility of a cat’s eye. When it is completely dark, cat’s vision is not so different from a human. What is for them a very specific eyes that are tailored to the reduced light, but such conditions they are no problem. The cat’s eyes capture and use every ray of light available to them, and they used to navigate. Whether it’s about getting around the home or outside the home, light serves as navigation.
Cat’s eye retina is not proportionately greater than human, but receives an unusually large amount of light. The reason for this are much higher cornea, pupil and lens. Another benefit of this design is more rounded and shorter eyeball that expands the field of vision. Overlapping field of view, creates a stereoscopic effect. To help understand and compare the benefits of cat vision, we compare it to the human. The human has a field of view of about 190 degrees with aging which falls to about 140 degrees, of which 120 degrees binocular overlap. Cat has a field of view of 285 degrees or 130 degrees of binocular overlap.Binocular vision is the kind of vision in which the two eyes animal species used in the common visual perception.
Advantages and disadvantages of cat vision
Like humans, and cats see a binocular. This means that parts of the visual field, each of its two eyes overlap. Such overlap is necessary for stereoscopic effect; If one eye only works with the field of view that it does not interfere with the line of sight of another, the brain can not create a three-dimensional image. Binocular vision is very important for an animal that is a hunter, as is the case with the cat. It helps her to assess the distance well, or how much she needed to reach the goal. Although such an assessment distance is not exactly as in humans, it is certainly better than in dogs.The human field of vision is not as wide as in cats, but we make up a much greater mobility of the eye that allows a large area of sclera surrounding the iris.
Unlike other animals, the ability to focus is developed in cats as well as in humans. When the eye focuses an object, the shape of the lens is changed by using the thin muscle behind the iris (the process is known as focusing). Contraction of these muscles, the lens bends the subject closer eye comes into focus. When you relax, the lens is corrected in the focus of the distant objects. As far as color recognition, which for a time considered to be a cat blind to color and you can see only in shades of black, gray and white. Studies have shown that cats can be trained to distinguish between colors, although it requires a long period.Many scientists say that cats do not pay attention to the colors, and even see them, do not attach any importance to them too.
Cat hearing function
Good hunter besides sharp vision need to have sensitive hearing. Cat and man have roughly equal ability to determine the place from where the sound originates. Two different sound separated by an angle of five degrees with an accuracy of about 75 percent. Like humans, cats used sophisticated form of the outer ear to gather information about the differences in sound quality, but these differences also help to determine the exact place where is her goal. Sound waves are collected outside the ear funnel-shaped and carried to the eardrum. This membrane vibrates like the skin on a drum and thereby moving three thin bones that lie in the middle ear. Next to their movement is transferred to the entrance of the inner ear called. vestibule. Then the sound waves reach the cochlea, the spiral system of chambers filled with fluid. In these chambers is sensitive Cortijev body (named after the Italian anatomist Alfonso Corti) that converts sound into electrical impulses through the auditory nerve transmits them to the brain.
In the skull cats have two large chambers swing that animal give a high sensitivity to the sounds of certain frequencies, such as noise created by small animals or cat’s prey. Like dogs, cats can hear high-frequency sounds much better than us. In addition, the cat has an excellent resolving power of high frequency tones. The best time of life can pinpoint sounds that vary by a fifth or a tenth of a ton. As with humans, with the cat’s age it’s sensitivity is lost to high frequency sounds. This softens of the hearing can begin at the age of three years, and it is very obvious in age from four to five years.
Cat eye function
Cat’s eye function can be compared with the camera, although it is more accurate than the eye. The light passes through the movable opening (through the pupil in the iris) that controls the amount of light that enters the lens and directs. Unlike the camera where the lens moves back and forth in order to change the focus of the lens in the eye by changing Mackin changing the shape and pulling muscles.
At the end of the light falling on the retina (for analog cameras was the movie), which through the visual nerve sends impulses to the visual center in the brain. Like a human, a cat retina contains two types of sensory cells: rods and cones.Sticks allow good vision in the dark and sensitivity to low light, and cones give the power of discernment or ability to obtain two separate images from two different sources. Cat’s eyes have more rods and cones less than a man. Therefore cats see better in a small amount of light, but they lack a better resolving power. Hole of cat’s pupils protects the retina from bright light. When pupils thigh much as they can, they are completely tears in the middle, leaving only a narrow slit with a hole at each end.