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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.
A vitrectomy is an operation to remove the vitreous gel from the inside of the eye. This is necessary in order to carry out procedures that cannot be performed with the fluid in its place. The vitreous is a clear jelly-like substance which occupies about two-thirds of the eye, lying between the lens and the retina.