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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.
Removal of vitreous gel (Vitrectomy) is done to repair many of the retinal disorders, which were previously considered inoperable. The procedure is done through three tiny incisions in the eye for three separate instruments. These incisions are placed in the pars plana of the eye, which is located between the iris and retina. Entering the eye through this location avoids damage to the retina and the crystalline lens. The instruments, which pass through these incisions, include a light pipe, an infusion port, and the vitreous cutting device. The light pipe is the high-intensity flashlight and is used to illuminate inside of the eye.