The vitreous humor is one of the tissues of the human eye. The vitreous humor is a colorless, transparent gel that is located behind the lens and filled between the lens and the retina. It is filled in the cavity behind the lens and has the role of refraction and fixation of the retina. Vitreous humor is not glass, it is a glass-like substance in the human eye, colorless and transparent, semi-solid, gel-like, the main component is water, accounting for about 99% of the volume of the vitreous humor. There is a concave surface in front of the vitreous body that can just accommodate the lens, called the vitreous concave. When young, the lens and vitreous body can be better connected closely, and with gradual aging, the adhesion between the lens and vitreous body gradually becomes worse, so it is easy to separate them during age-related cataract surgery. The vitreous is surrounded by a dense layer of material called the vitreous membrane, which is divided into two parts, anterior and posterior, the anterior and posterior boundary membranes. There are no blood vessels in the vitreous, and the nutrients it needs come from the atrial fluid and choroid, thus it is slow to metabolize and cannot regenerate, and if there is a defect, its space is filled by the atrial fluid. When the vitreous becomes cloudy for various reasons, it will feel like there are flying mosquitoes in front of the eyes when looking at things. In addition, with age or due to high myopia and other reasons, the semi-solid gel-like vitreous body will gradually become liquid, called vitreous liquefaction. The vitreous body and the lens, atrial fluid, cornea, etc. together constitute the refractive interstitium of the eye, and play a supporting role for the retina and the wall of the eye, so that the retina and the choroid, in trauma or surgery, once the vitreous body is lost, it is easy to cause retinal detachment.