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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.
In Depth: Vitreous and Aqueous Humor. Gel-like fluids inside the eye help it maintain its shape, which plays an important role in overall eye health. These substances are called the vitreous humor and aqueous humor. Vitreous is a transparent substance that is around 99 percent water. The remaining one percent is collagen and hyaluronic acid, which cause vitreous to have a gelatinous consistency.