Vitreous humor is a transparent gel, filled in the vitreous cavity, accounting for 4/5 of the entire volume of the eye, the specific functions are as follows:1, support role: vitreous humor plays a supporting role for the retina, with cushioning external forces as well as the role of anti-vibration. After vitreous surgery, after the removal of the vitreous, the eye should be filled with gas or silicone oil, is to play a supporting role for the retina. 2, the main component of the refractive interstitial: vitreous or the main component of the refractive interstitial in the eye, light through the cornea, atrial aqueous, pupil, lens, through the vitreous to reach the retina above. So the vitreous is intact and transparent in order to have no effect on the refractive interstitium. things like vitreous inflammation, hemorrhagic cells or hemorrhage can cause vision loss. 3. constitutes a barrier: the vitreous also constitutes a number of barriers that prevent large molecules within the retina from entering the vitreous. A normal vitreous also inhibits the proliferation of many kinds of cells, which can maintain the stability of the intravitreal environment.