6. Specific Spots On The Eye
You have the eyelid, the pupil, the sclera, the
iris, and the limbus.
Friday, February 1, 2013
7. The Pupil
The 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.
Friday, February 1, 2013
8. Lens
The 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.
Friday, February 1, 2013
9. The Iris
The 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.
Friday, February 1, 2013
10. Optic Nerve
It'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.
Friday, February 1, 2013
11. 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.
Friday, February 1, 2013
