The vitreous humor (also known simply as the vitreous) is the gel that fills the space between the lens and the retina of the eyeball. It is a clear, gel-like substance and 2-4 times thicker than water. Ninety-nine percent of its volume is water. Vitreous helps the eye maintain its shape and refracts lights. Should suspension occurs, patients are likely to see dark spot floating (floaters) which is mostly found in patients above 40 years or sooner in very shortsighted cases or history of severe eye injury.