The vitreous body is a transparent, jelly-like structure that occupies most of your eye.

Health · Published 3 October 2026 Swipe more like this →

In short: This clear, semisolid gel fills the large cavity behind your lens, accounting for four-fifths of your eyeball's volume. Composed almost entirely of water, it maintains the eye's spherical shape and keeps the retina pressed against the choroid. Despite its simplicity, this vital substance undergoes complex changes throughout your entire life.

The vitreous body is a remarkable biological structure, consisting of approximately 98% water. The remaining small fraction of solid material is primarily a network of collagen, specifically a form known as vitrosin, alongside hyaluronic acid. This composition gives the vitreous a gelatinous consistency with a viscosity two to four times that of water. While it is generally devoid of cells, it contains specialized hyalocytes that assist in maintenance, and phagocytes that clear cellular debris from the visual field.

During prenatal development, the vitreous plays a critical role in forming eye structures. Research indicates it contains various antioxidant molecules, such as ascorbic acid, lutein, and bilirubin, which protect developing tissues from reactive oxygen species. The concentration of these antioxidants shifts during gestation; for instance, levels of ascorbic acid and erythropoietin increase between 10 and 31 weeks of pregnancy, while others like albumin decrease. Scientists suggest that understanding this antioxidant status is essential for potential prophylactic approaches to ocular diseases.

As humans age, the vitreous undergoes significant physical transformations. At birth, it is a homogeneous, finely striated mass. By adolescence, the cortex becomes denser and distinct sheet-like vitreous tracts begin to form. In adulthood, these tracts become more defined and sinuous. Eventually, the central portion of the vitreous liquefies and fibrillar degeneration occurs—a process known as syneresis. These changes are important because the vitreous is firmly attached to sensitive areas like the macula and retinal vessels; degenerative shifts or trauma can lead to retinal breaks or detachment.

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