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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.
Vitrectomy for macular hole. 1  Detaching the vitreous gel from the retinal surface is an important part of macular hole surgery. In addition, there are frequently thin membranes on the retinal surface surrounding the hole that are peeled to release traction on the retina and allow the hole to close.