Vitreous humor

Definition

The vitreous humor is a clear, gel-like substance that fills the space between the lens and the retina of the eye. It helps maintain the eye's shape and optical properties.

5 Must Know Facts For Your Next Test

1. The vitreous humor is composed mainly of water (about 99%) and a network of collagen fibers and hyaluronic acid.
2. It plays a crucial role in maintaining intraocular pressure and providing structural support to the eye.
3. Unlike other body fluids, the vitreous humor does not actively exchange substances with blood vessels, making it more susceptible to long-term accumulation of debris.
4. Infections of the vitreous humor, such as endophthalmitis, can occur due to microbial invasion post-surgery or trauma.
5. Changes in the vitreous humor's consistency over time can lead to conditions like posterior vitreous detachment (PVD), which may cause floaters.

Review Questions

• What are the primary components of vitreous humor?
• How does the vitreous humor contribute to maintaining intraocular pressure?
• Why is the vitreous humor particularly susceptible to long-term debris accumulation?

Related terms

Aqueous Humor: A clear fluid in front of the lens that nourishes the eye and maintains intraocular pressure.

Endophthalmitis: An inflammation of the interior tissues of the eye usually caused by infection.

Posterior Vitreous Detachment (PVD): A condition where the vitreous gel separates from the retina, often leading to floaters.