What it is
In some eyes, the drainage angle — the space between the iris (the coloured part of the eye) and the cornea where fluid leaves the eye — is narrow. This can cause a sudden, painful rise in eye pressure (acute angle-closure glaucoma) or slow damage over time. A YAG laser iridotomy makes a tiny hole near the edge of the iris, giving fluid a new path and allowing the angle to open.
Who it's for
People found to have narrow or closed drainage angles on examination (gonioscopy), people who have had an angle-closure attack, and sometimes the other eye as a preventive measure.
What to expect
Drops are given beforehand to prepare the eye and control pressure. The eye is numbed and a special contact lens is placed on it. The laser takes a few minutes, and you may feel a brief sharp sensation.
Recovery
Mild blurring, redness or an ache for a day is common. You will use anti-inflammatory drops for a few days, and your eye pressure will be checked. Keep your follow-up appointments, as some people still need glaucoma drops afterwards.
Frequently asked questions
What are the warning signs of an angle-closure attack?
Severe eye pain, headache, a red eye, blurred vision with coloured haloes around lights, and nausea or vomiting. This is an emergency — come to the hospital immediately.
Medically reviewed by Dr. Sweta Patro