The vitreous body helps to stabilize the eye and holds the retina up against the eyewall. It fills the cavity behind the lens and is a gel-like substance consisting of water, collagen, and hyaluronic acid. It is not replaced at the rate of 20 percent per year until middle age and it does not circulate through the pupil. It does not hold the retina against the lens for proper refraction.

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The Vitreous Body

Question 37

Multiple Choice

The vitreous body

A) fills the posterior chamber.
B) helps to stabilize the eye and holds the retina up against the eyewall.
C) is replaced at the rate of 20 percent per year until middle age.
D) circulates through the pupil.
E) holds the retina against the lens for proper refraction.

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