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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.
1 Retina: Layer of tissue on the back portion of the eye that contains cells responsive to light (photoreceptors). 2  Rods: Photoreceptors responsive in low light conditions. 3  Cones: Photoreceptors responsive to color and in bright conditions.4  Sclera: Protect coating around the posterior five-sixths of the eyeball.he iris is a muscle that controls the size of the pupil and therefore, the amount of light that enters the eye. Also, the color of your eyes is determined by the iris. The vitreous or vitreous humor is a clear gel that provides constant pressure to maintain the shape of the eye.