Chronic angle-closure glaucoma surgery is performed to treat glaucoma caused by a narrow or closed angle between the iris and cornea, which leads to an increase in intraocular pressure (IOP) and damage to the optic nerve. The procedure involves surgically creating a new drainage pathway for the aqueous humor, the fluid inside the eye, to alleviate the increased pressure.

One common surgical option for angle-closure glaucoma is laser peripheral iridotomy, where a small hole is created in the peripheral iris to open the drainage angle and allow fluid to drain more freely. In some cases, surgery may also include cataract extraction or other techniques to treat the underlying cause.

Chronic angle-closure glaucoma surgery aims to reduce IOP, prevent optic nerve damage, and preserve vision in patients with this type of glaucoma. The procedure can be highly effective in stabilizing the condition and preventing further vision loss.