It is located behind the lens, filled between the lens and retina, and filled in the cavity behind the lens, and has the function of refracting and fixing the retina.

Vitreous body is not glass, but a substance similar to glass in human eyes. Colorless, transparent, semi-solid, colloidal, the main component is water, accounting for about 99% of the vitreous body volume. There is a concave surface in front of the vitreous body, which can just accommodate the lens. It is called the glass recess. When young, the lens and vitreous can adhere closely, but with the gradual growth of age, the adhesion between lens and vitreous becomes worse, so it is easy to separate in senile cataract surgery. There is a high-density substance around the vitreous called vitreous membrane, which is divided into two parts: anterior limiting membrane and posterior limiting membrane. There are no blood vessels in the vitreous body, and the nutrients it needs come from aqueous humor and choroid, so its metabolism is slow and it cannot be regenerated. If it is defective, its space will be filled with room water. When the vitreous body is turbid for various reasons, you will feel mosquitoes flying in front of you when you look at things. In addition, with the increase of age, or due to high myopia and other reasons, the semi-solid gel-like glass body gradually becomes liquid, which is called vitreous liquefaction.

Vitreous body, aqueous lens, cornea, etc. Together, it forms the refractive stroma of the eye, supports the retina and the wall of the eye ball, and makes the retina and choroid fit together. In trauma or surgery, once vitreous loss occurs, it is easy to cause retinal detachment.