What is Aqueous Humor best described as?

• A. the clear fluid filling the space in the front of the eyeball between the lens and the cornea
• B. the transparent jellylike tissue filling the eyeball behind the lens
• C. tough, white outer coat of the eyeball
• D. light sensitive cells that respond to color

Answer: (A)

Aqueous humor is the clear, watery fluid that fills the space in front of the eye between the cornea and the lens. It is produced by the ciliary body, flows from the posterior chamber through the pupil into the anterior chamber, and is drained to help maintain intraocular pressure. This fluid nourishes the cornea and the lens, which don’t have their own blood vessels, and helps keep the eye’s shape for proper focusing. It’s different from the jellylike substance behind the lens, which is the vitreous humor, the tough white outer coat of the eye (the sclera), and the light-sensitive cells that detect color and light (rods and cones).