What is the iridocorneal angle?

• A. Area between base of iris and cornea where aqueous humor drains
• B. Area between iris and lens
• C. Space between cornea and sclera
• D. Angle between iris and retina

Answer: (A)

The iridocorneal angle is the drainage angle of the eye—the region where the iris meets the cornea at the periphery of the anterior chamber. It’s here that the aqueous humor drains out of the eye through the trabecular meshwork into Schlemm’s canal and onward to the venous system. Aqueous humor is produced by the ciliary body, flows from the posterior chamber through the pupil into the anterior chamber, and then exits via this angle. Clinically, the width of this angle determines open versus narrow or closed angles, which has direct implications for glaucoma risk and management. The other spaces mentioned do not represent the drainage pathway: the space between the iris and lens is the posterior chamber; the space between the cornea and sclera isn’t the drainage angle; and the angle between the iris and retina lies in the posterior segment.