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Posterior Vitreous Detachment
The eye is filled with a substance called vitreous just as air fills a room.  Part of the vitreous is a liquid like water. The other part is a gel, like sticky jello.  The gel part is initially attached in a band about 2/3 of the way toward the front of the eye (vitreous base) and at the optic nerve all the way at the back of the inside of the eye.  As a normal occurrence, the attachment at the optic nerve releases and the gel vitreous moves forward.  This is a normal event and is called a vitreous detachment.