Friday, August 13, 2010
Eyes Of The World Knows As Eyeglasses
Located just behind the opening, the goal is one of the factors that determine how the eye focuses, and is responsible for the development of the eye to nearby objects. As we age, the lens becomes thicker and less flexible, causing a steady decline in focusing ability of the eye known as presbyopia. The lens can develop cataracts as a result of life or injury, or may be present at birth.
This is a ring-shaped eye color, and is responsible for controlling the amount of light entering the eye. In the light, the iris constricts to make a hole in the iris, pupil, smaller, to reduce the amount of light entering the eye. In the dark, the iris expands, increasing the size of the pupil and allow light into the eye.
This is a transparent dome over the iris and an average of only 1 / 2 mm thick. The cornea is one of the factors that determine how the eye is focused. Contact lenses are worn on the cornea and is also a laser refractive surgery, where it is made.
It is a round hole in the center of the iris and the size of the evolution of different lighting conditions. The student is usually black, but if the eye is on the middle, as if the flash fires, the color will be visible to the eye and the pupil appears red.
This fluid fills the space between the cornea and lens, and always produced and constantly dehydrated. The quantities of water in the eye determines the pressure in the eye, which varies at different times and different days. If the pressure in the eye is too high to tolerate eye tissue, glaucoma may develop.
It is a thin layer of tissue that covers the sclera transparent white of the eye. Conjunctiva contains many blood vessels that fill with blood and expand, if the eye is irritated, what the eye looks red.
It is hard white outer covering of the eye, which gives the eye its shape and strength to resist damage.
The gelatinous substance fills the space between the lens and retina. They often contain glass fibers or clumps, which are considered as black or transparent forms in a change of vision, called floaters. It is normal to notice an increase in swimming time. vitreous humor is contained in a capsule that is attached to the retina in several respects. At some point in life, usually in 50 or 60 pulls the capsule of the vitreous to the retina and collapses on itself, like a balloon deflating. This is called vitreous detachment, and is a normal part of aging.
This thin layer of tissue lines the inside of the eyeball and contains cells that receive light and to put the visual messages that are sent to the brain via the optic nerve. Retina also contains many blood vessels, which as a result of various eye diseases or disesases, it can cause damage and bleeding, which causes blindness. Retinal detachment occurs when it loses its attachment to the part of the eye, allowing it to the wall of the eye.
This is an area in the central part of the retina that provides detailed vision. Disease or injury has affected this area will almost always result in a significant loss of vision. One of the most common diseases affecting this part of the retina macular degeneration.
The optic nerve transmits messages from the retina to the brain, which interprets the message, which leads to the perception of vision. Glaucoma damages the optic nerve, causing nerve fibers gradually disappear, which, in a subtle, but progressive loss of vision.