Saturday, October 24, 2009

Eyes, Eye disease , Pupil

Eyes are organs of vision that detect light to distinguish color and read, which is the simplest eyes nothing else but to know whether the surroundings are light or dark.
the part of the eye

The cornea is the outermost part of the eyeball that receives light from light sources.
Pupil and Iris from the cornea, the light will be forwarded to the pupils. Pupils determine the quantity of light entering the greater part of the eye. Pupils will be widened if the dark room conditions, and will be narrowed if the room light conditions. Wide pupils affected by the slice in sekelilingnya.Iris serves as the diaphragm. Iris is seen as part of the color on the eyes.
Lens of the eye receives light from the pupil and pass them on to the retina. The function is the eye lens focus the light, so that the light falls exactly on the retina of yellow spots. To see a distant object (the light coming from far away), eye lens will be thinner. As for seeing near objects (the light comes from the close), will thicken the eye lens.
Retina of the eye is most sensitive to light, particularly the retina called the yellow dots. After the retina, the light transmitted to the optic nerve.
Neural cells into the ropes and cones in the retina, to go to the brain.

Eye disease
Myopia ie someone who can not see distant objects. Usually occurs in students.
Hipermetropi is a user who can not see distant objects near the eye.
Presbiopi is someone who can not see distant objects near or far away. Common in the elderly.
Myopia and blindness, blind means a person can not see any thing at all. Blind could have caused the descendants, as well as accidents. Blindness means that a person can only see dimly. The people who are blind or myopic usually "read" with her fingers. This is called Braille.
Color blindness is a condition where a person is not able to distinguish colors. Which can be seen only in black, gray, and white. Color blindness is usually hereditary. This means that if someone is color blind, almost certainly his son is also color blind.
Cataract is an eye disease in which the lens of the eye becomes opaque and occurs in the elderly (seniors).

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