here are some details that taken from www.mdsupport.org .... this is a copyright page, that is purposed for personal use only....
Retinal Detachment
The retina is attached to the sclera in the back of the eye, and a retinal detachment occurs when it is pulled away from this normal position. The retina, like film in a camera, is responsible for creating the images that one sees. A good picture could not be produced if the film were not in its correct location within the camera, and we lose vision if the retina is not in its proper place within the eye.
The retina detaches by separating from the back wall of the eye. When it is removed from its blood supply (the choroid), it will lose nourishment and result in a loss of some vision if not repaired in time. This retinal tear may be caused by trauma or by a vitreous detachment (or "posterior vitreous detachment"). Vitreous detachment, not uncommon in older people, results from the vitreous fluid shrinking and pulling away from the retina. This causes "floaters," which do not damage the retina or vision. However, for a certain percentage of individuals, the vitreous continues to pull away near the torn area and could peel the retina from its normal position in the eye.
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