Eye is one of the sensing devices are priceless. Eye consists of the eyeball which is located in the curve of the eye. In the eyeball consists of important parts in the vision, namely: the iris (iris), the pupil, cornea (cornea), eyepiece, translucent body, retina (retina), optic nerve.
a. Iris
1) membrane provides the pattern of rainbow colors on our eyes
2) The middle of the iris are pupils (pupil) which controls the light entering the eye
3) The pupils will shrink if the light received by the eye too much, and be enlarged if the light received too little.
b. Cornea (cornea)
1) The cornea is transparent and no vascular blood
2) Functioning forward light entering the eye to the retina.
c. Eyepiece
1) As elastic, can mencembung and flattened
2) Functioning focus light entering the eye so that the bias falls right in the retina.
d. Agency clear
1) It is the most extensive part, exactly behind the lens
2) The lymph contains substances such as agar
3) Serves forward light from the lens to the retina of the eye.
e. Retina of the eye (retina)
1) Is highly sensitive to light entering the eye, because it has the nerve cells of the recipient
2) Functioning forward light stimuli into nerve of the eye.
f. The optic nerve (optic nerve)
1) Function forward light stimuli it receives to the central nervous system in the brain
2) After the stimuli received by the brain, then we see the bias.
g. The parts that protect the eyes
1) eyebrows, useful to avoid the entry of sweat
2) eyelids, useful to protect the eyes from dust, smoke, sweat, and other foreign objects
3) Eyelashes, point to reduce the incoming light and dirt
4) tear glands, produce a useful tears to moisten the cornea.
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