Which fluid fills the anterior chamber of the eye?

• A. Aqueous Humor
• B. Vitreous Humor
• C. Lymph
• D. Tears

Answer: (A)

The space in front of the iris, between the cornea and the iris, is filled with aqueous humor. This clear fluid is produced by the ciliary body, then flows from the posterior chamber through the pupil into the anterior chamber and drains out via the trabecular meshwork. Its roles include nourishing the avascular structures of the eye, like the cornea and lens, and helping to maintain the eye’s shape and intraocular pressure through circulation.

Vitreous humor, by contrast, fills the large space behind the lens in the posterior segment of the eye, not the anterior chamber. Tears are the fluid layer on the surface of the eye, and lymph is a body-wide fluid in the lymphatic system, not contained within the anterior chamber.