**Question:** Treatment of choice for acute angle closure glaucoma is

A. Laser peripheral iridotomy
B. Medical therapy
C. Paracentesis
D. Intraocular pressure (IOP) reduction

**Core Concept:**
Acute angle closure glaucoma is a life-threatening emergency in ophthalmology, characterized by rapid rise in intraocular pressure (IOP) due to closure of the angle between the cornea and the iris, leading to impaired aqueous humor drainage. It presents with characteristic symptoms like pain, blurred vision, nausea, vomiting, and photophobia.

**Why the Correct Answer is Right:**
The correct answer is A: Laser peripheral iridotomy (LPI). In acute angle closure glaucoma, the primary aim of treatment is to restore aqueous humor drainage by creating a small hole in the peripheral iris, thereby widening the angle and improving the flow of aqueous humor. LPIs are performed using a laser, which creates a small opening in the peripheral iris, preventing the closure of the angle and reducing IOP quickly.

**Why Each Wrong Option is Incorrect:**

B: Medical therapy (e.g., timolol, beta-blockers) is used as a secondary option in combination with LPI or paracentesis. It can lower IOP but does not address the primary issue of angle closure or improve aqueous humor drainage directly.

C: Paracentesis is not the first-line treatment for acute angle closure glaucoma. It involves making a small opening in the sclera to relieve the increased IOP, but it is less specific and targeted compared to LPI.

D: Intraocular pressure is a measure of the severity of the condition, not the primary treatment approach. Lowering IOP is important but addressing the angle closure directly with LPI is crucial to prevent permanent vision loss.

**Clinical Pearl:**
In acute angle closure glaucoma, prompt intervention is essential to prevent significant damage to the optic nerve and irreversible vision loss. LPI is the primary treatment option to restore aqueous humor drainage, decrease IOP, and prevent complications. Following LPI, appropriate medical therapy and close monitoring are essential for long-term management.

Remember, acute angle closure glaucoma is a life-threatening emergency requiring immediate attention by an ophthalmologist.