Eye,Parts of the Eye and their Functions

Eye


Is the most important part of the human body.It is a round-shaped organ that is responsible for us to see.And to interpret the shapes,colors and dimensions of object in the world.The human eye has a limitations.The can only see in dim or bright light,but cannot see things when the light is absents.



PARTS OF THE EYE

.CORNEA-is a round transparent membrane which forms the eyeballs outer coating.Cornea serves as a “window of the eye”.Damage to the outer cornea may cause uncomfortable or painful,but usually can heal quickly.

2.LENS-lens is a jelly-like assembly transparent of tiny fibers or transparent crystalline lens of the eye.It is responsible to bend light rays that enter to the eye.

3.IRIS-Iris is the colored part of the eye.It is the one who control the amount of light that enters to the eye.The iris lies between cornea and crystalline lens.Iris is made oftwo different muscles fibers that control yhe size of the pupil.

4.PUPIL-is the hole in the center of the eye which allows light to pass intothe eyes from the aqueous humor to the lens.

5.CILIARY MUSCLE-contract and expands to control the curvature of the lens.Behind the lens is a cavity filled with another liquid,the virtreuos humor and behind this cavity is the retina.

6.VIRTREOUS HUMOR-is the part of the human eye that provides nourishments to the front parts of the eye and maintain the eye pressure.

7.RETINA-is the innermost layer of the eye.It serves as the “screen”of the eye where the image is formed.It contains tiny cells called rods and cones.
CONES-is responsible for vision in bright condition while,
RODS-is responsible for dim comditions.It’s because the sensation of the color is produced by the cones.

The rods and the cones responds the image form on the retina and the information is transmitted to the brain by the optic nerve.

8.FORVEA CENTRALIS-is the center of the eye sharpest vision and the location of most color perception

9.OPTIC NERVE-is the pathway that light rays take from the retina to the processing center of the brain.

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