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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.
Many retinal diseases require laser photocoagulation treatment as a part of vitrectomy surgery. The laser is often used to treat vitreous hemorrhage (suspended blood in the vitreous gel) or abnormal blood vessels in diabetic retinopathy as well as seal tears in the retina that can lead to retinal detachment.