The human eye

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  • Publicado : 10 de noviembre de 2010
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Eye Work Invidual components of the eye work in a manner similar to a camera. Each part plays a vital role in providing clear vision. if one of them gets hurt, it affects all of your vision. So think of the eye as a camera with the cornea, acting lens cover. As the eye's main focusing element, the cornea takes widely diverging rays of light and bends them through the pupil, the dark, roundopening in the center of the coloured iris. The iris and pupil act like the aperture (a small narrow opening) of a camera. Next in line is the lens which acts like the lens in a camera, helping to focus light to the back of the eye. Note that the lens is the part which becomes cloudy and is removed during cataract surgery to be replaced by an artificial implant nowadays.
The very back of the eye islined with a layer called the retina which acts very much like th fil of th camera. Th retina i a hi h t h lik the film f the The ti is membrane containing photoreceptor nerve cells that lines the inside back wall of the eye. The photoreceptor nerve cells of the retina change the light rays into electrical impulses and send them through the optic nerve to the brain where an image is perceived. Thecenter 10% of the retina is called the macula. This is responsible for your sharp vision, your reading vision. The peripheral retina is responsible for the peripheral vision. As with the camera, if the "film" is bad in the eye (i.e. the retina), no matter how good the rest of the eye is, you will not get a good picture. The human eye accommodates to changing lighting conditions and focuses lightrays originating from various distances from the eye. When all of the components of the eye eye function properly, light is converted to impulses and conveyed to the brain where an image is perceived.

What and Importance The human eye is organ of vision. A vital organ of vision it plays a very important role not only in life but also the Human body. The human eye is the organ which gives us thesense of sight, allowing us to learn more about the surrounding world than we do with any of the other four senses. The eye allows us to see and interpret the shapes, colors, shapes colors and dimensions of objects in the world by processing the light they reflect or emit. The eye is able to see in bright light or in dim light, but it cannot see objects when there is no light.
We use our eyes inalmost every activity we perform, whether reading, watching television, and in other countless ways. Now days, good vision is critical and essential to conducting activities of daily living easily. It is important for language, and affects developmental learning, communicating, working, health and quality of life. It is very important to take care of your eyesight. Imagine not being able to read thenewspaper, see if you are going to be hit by a car, or drcar. Without a healthy vision you will be forced to rely on others to cross the street or go grocery shopping, becoming many times very inconvenient. Most people probably would gree that sight is the sense they'd value more than the restive a.

Diagnosis/Diseases/Treatment •Amblyopia •Cataract •Color Blindness •Conjunctivitis (Pink Eye)•Floaters •Glaucoma •Congenital •Macular Degeneration •Macular Hole

Technology •Amsler Grid •Vision test •Ophthalmoscopy •Fundus Photography •Fluorescein Angiography •Cataract Surgery •Glaucome •Laser peripheral iridotomy (PI) •Contact Lens

Eye Care You always should take care of your eyes to make sure they are always healthy and safe What should I do if I get something in my eye? If you getsomething in your eye, NEVER EVER rub your eyes! Eyes are sensitive and can be scratched easily. Instead keep blinking till your eye waters. How can I protect my eyes when I an active? When playing sports or constructing always use the proper eye constructing, protection, such as goggles, helmets, or visors. Why should I never look into the sun? Your eyes are made to see only certain kinds of...
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