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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.
The retina is the inner coating of the eye, running from the edge of the iris back to the optic nerve. The retina is a thin tissue layer that contains millions of nerve cells. The nerve cells are sensitive to light. A main purpose of your eye is to focus light on the retina.