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The main functions of the vitreous are to transmit light to the retina, and to exert enough pressure to keep the retinal layers tightly pressed together. This pressure helps maintain the round shape of the eye so the lens can focus sharp images on the retina. The vitreous is very different from the aqueous humor.
And it becomes increasingly common after age 50.As you age, the vitreous gel in the middle of your eye begins to change. The gel's normal structure breaks down in a process called syneresis. Parts of the gel shrink and lose fluid. The fluid collects in pockets in the middle of the eye, and thick strands of the gel form and drift through the eye. These strands appear as floaters.Sometimes these changes cause the vitreous gel to shrink suddenly and separate from the retina. This is called posterior vitreous detachment.Posterior