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Vitreous chamber of eyeball

The vitreous chamber is the largest cavity within the eyeball, occupying the space between the lens and the retina. Filled with a transparent, gel-like substance known as the vitreous humor (or vitreous body), it plays a crucial role in maintaining the eyeball’s shape and allowing light to reach the retina unobstructed. The vitreous chamber, an essential component of ocular anatomy, can be visualized on imaging modalities such as MRI and CT, each providing distinct insights into its structure and pathology.

Synonyms

  • Vitreous cavity

  • Vitreous body cavity

  • Posterior chamber of the eye (Note: Technically, the "posterior chamber" is a separate anatomical space, but the term is sometimes incorrectly used)

  • Ocular vitreous

Function

  • Maintains the spherical shape of the eyeball

  • Provides a clear, refractive medium for light transmission from the lens to the retina

  • Supports the retina by pressing it against the underlying choroid

  • Acts as a shock absorber, protecting the delicate retinal tissues

  • Serves as a pathway for metabolic exchange between ocular tissues

MRI Appearance

  • T1-Weighted Imaging (T1WI):

    • The vitreous chamber appears homogeneously hypointense (dark) due to its high water content and low protein concentration.

  • T2-Weighted Imaging (T2WI):

    • The vitreous chamber is hyperintense (bright), reflecting its fluid-like consistency, which allows for high signal on T2.

  • STIR (Short Tau Inversion Recovery):

    • The vitreous chamber appears bright (hyperintense), similar to other fluid-filled structures, as STIR is sensitive to water content and suppresses fat signals for clearer contrast.

CT Appearance

  • On CT scans, the vitreous chamber is seen as a hypodense (dark) area within the globe, with a density similar to water

MRI images

Vitreous chamber of eyeball mri image