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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.
Quick Answer. The vitreous humor helps to keep the retina firmly in place, according to WebRN-MacularDegeneration.com. Additionally, the vitreous humor fills much of the eye, allowing light to pass through the lens to the retina and helping the eye to keep its round shape. The space the vitreous humor fills is called the vitreous body.