What fills the vitreous chamber behind the lens and helps maintain eye shape?

• A. Aqueous humor
• B. Pupil
• C. Vitreous humor
• D. Iris

Answer: (C)

The space behind the lens is filled by the vitreous humor, a clear gel that forms the vitreous body. This gel fills the vitreous chamber and provides structural support to the eyeball, helping to maintain its shape and keep the retina pressed against the back of the eye for a stable optical surface. Aqueous humor fills the front compartments (between the cornea and lens) and circulates to help maintain pressure there, but it doesn’t fill the vitreous chamber. The pupil is simply the opening in the iris that lets light in, and the iris is the colored muscular structure around that opening. So the substance that fills the vitreous chamber and helps maintain eye shape is the vitreous humor.