whether those eyes?

Eyes are organs of vision that detect light. What do the simplest eye is nothing more than to know whether the surroundings are light or dark. More complex eyes are used to portray.

Organ

The sections on the eye organ works from the source to deliver light to the brains to be digested by the human nervous system. The sections are:

•     Cornea

      Outer part of the eyeball that receives light from the source of light.

•     Pupil and iris

      Of the cornea, the light will be sent to the student. Student determines the amount of light in the deeper part of the eye. Students broaden as the room is dark, and will be narrowed if the lighting conditions in the living room. The width of the pupil is affected by the slice in sekelilingnya.Iris acts as a diaphragm. Iris is seen as the colored part of the eye.

•   The lens

      Lens of the eye receives light of the students and pass on to the retina. The function of the lens to focus the light to adjust, so that the light falls exactly on the yellow spots on the retina. If you are a distant object (light coming from far away), eye lens will thin out. As for near vision (the light comes from the exit), the lens thicker.

•     Retina or membrane Jala

      The retina is part of the eye is most sensitive to light, particularly the retina called the yellow spots. After the retina, the light to the optic nerve.

•     Optic nerve

      Nerve entering the cord cells and cones in the retina, to the brains.


eye disease

• Miopi

      Miopi ie someone who can not see distant objects. It usually occurs in pelajar.dapat assisted with concave lens spectacles

• Hipermetropi

      Hipermetropi ie a user who can not see the object near the eye. Convex lens can be helped with glasses.

•   Presbiopi

      Presbiopi is someone who can not see the object in the neighborhood and the distance jauh.Can assisted with a dual lens goggles. Common in the elderly .

• myopia and blindness

      Blind means that a person can not see at all. Blindness can be caused by heredity, as well as accidents. Myopic: a person can only be seen by the weak. The people who are blind or myopic usually "read" with his fingers. This is called Braille.

•      Color Blind

      Color blindness is a condition where a person totally unable to discriminate between 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 their children are colorblind.

•     Cataract

      Cataract is an eye condition in which the lens becomes opaque due to thickening of the lens eyes and occurs in older adults (seniors).

•     Astigmatism = ketidakaturan curved - curved surface of the eye that result in bias light is not focused on a point of the retina (yellow spots). Can be helped with glasses-cylinder refractive surgery (graciella.sanjose.bali)