Question

Laser iridotomy is done in which type of glaucoma?

• A. Angle closure glaucoma
• B. Open angle glaucoma
• C. Pigmentary glaucoma
• D. None

Hint:

Iridotomy relieves pupillary block - which glaucoma has a blocked angle?

Answer 1

The Correct Option is A

Step 1: Start from the anatomy of the attack. In primary angle closure the iris root crowds against the meshwork because aqueous is trapped behind the iris, a state called pupillary block, raising intraocular pressure sharply.

Step 2: The logical cure is to give the trapped aqueous a shortcut. A laser punched hole in the peripheral iris lets fluid bypass the pupil and reach the anterior chamber directly, flattening the iris and pulling it away from the angle. This procedure is peripheral laser iridotomy.

Step 3: Because it directly targets pupillary block, iridotomy is reserved for the angle closure form, confirming that as the answer.

Step 4: By contrast, open angle and pigmentary glaucomas have a patent angle and no pupillary block, so they are treated with medication, trabeculoplasty, or filtering surgery rather than iridotomy.

\[\boxed{\text{Angle closure glaucoma}}\]