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Friday, February 1, 2013

The Eye


Specific Spots On The EyeYou have the eyelid, the pupil, the sclera, the

iris, and the limbus.


The PupilThe pupil is located in the middle of the eye. It allows light to enter the

retina (the color of your eye on the outside of the pupil). The pupil is black because the light is either absorbed by the tissue (the white part) inside, or, the eye directly. The pupil is a hole In the eye that leads to

the lens where you see.


LensThe crystalline lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to

refract light to be focused on the retina. The lens, by changing shape, functions to change the focal distance of the eye so that it can focus on objects at various distances, thus allowing a sharp real image of the object@ of interest to be formed on the retina. This adjustment of the lens is known as accommodation (see also Accommodation, below). Accommodation is similar to the focusing of a photographic camera via

movement of its lenses. The lens is more flat on its anterior side than on its posterior side.The lens is also known as the aquula (Latin, a little stream, dim. of aqua, water) or crystalline lens. In

humans, the refractive power of the lens in its natural environment is approximately 18 dioptres, roughly one-third of the eye's total power.


The IrisThe iris controls how much light you get from whatever it is you

look at. It also controls the size of the pupil. Your iris can shrink and grow depending on the type of light in the room that your in. If your in a dark room, your iris will grow so you can see better. If your in

a bright room, your iris shirks cause you can see better and it doesn't really need that much force.


Optic NerveIt's the main nerve of the eye. It carries all the light waves and stuff into your brain to make them images. If your messed up in this part of your eyes it would make you

blind because it connects to all the parts of the eye and brings it to the brain.


The Sclera

The sclera is commonly known as "the white of the eye." It is the tough, opaque tissue that serves as the eye's protective outer coat. Six tiny muscles connect to it around the eye and

control the eye's movements. The optic nerve is attached to the sclera at the very back of the eye.

In children, the sclera is thinner and more translucent, allowing the underlying tissue to show through and giving it a bluish cast. As we age, the sclera tends to become more yellow.


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