The vitreous humour is a gel-like substance behind the lens. It helps the eye to maintain its shape, and light passes through it on its way to the retina.
If the eye hemorrhages or the retina tears, debris can cloud the vitreous and result in vision loss. If the retina is partially detached, vitreous fluid can also get behind the retina and cause the detachment to become worse. These problems are often treated with a procedure called a vitrectomy.
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