Okay, let's tackle this question about angle-closure glaucoma treatment for the fellow eye. First, I need to recall what angle-closure glaucoma is. It's when the iris blocks the trabecular meshwork, causing a sudden increase in intraocular pressure. The question is about treating the fellow eye, so maybe it's about preventing the same issue in the other eye.

The options aren't provided, but the correct answer is likely a prophylactic treatment. Common treatments for acute angle-closure glaucoma include medications like beta-blockers, alpha agonists, or carbonic anhydrase inhibitors to reduce aqueous production. But for the fellow eye, which is at risk, the standard prophylaxis is laser peripheral iridotomy. That procedure creates a small hole in the iris to allow fluid to flow between the anterior and posterior chambers, preventing the angle closure.

Wait, but the options might include different treatments. Let me think. If the correct answer is laser iridotomy, then the other options could be things like topical steroids, which are not used for prophylaxis. Or maybe other surgeries like trabeculectomy, which is for open-angle glaucoma. Another distractor might be a mydriatic, which could worsen the condition by pulling the iris forward.

So, the core concept here is that after an acute angle-closure episode, the unaffected eye (fellow eye) should undergo prophylactic laser peripheral iridotomy to prevent an attack. The correct answer would be that procedure. The incorrect options would be treatments not indicated for prophylaxis. For example, beta-blockers or carbonic anhydrase inhibitors are used acutely but not prophylactically. Also, mydriatics like tropicamide could actually exacerbate angle closure by causing pupillary dilation, which pulls the iris forward.

The clinical pearl here is that prophylactic laser iridotomy is the gold standard for the fellow eye in angle-closure glaucoma. Students should remember that once one eye has an attack, the other is at high risk and needs preventive treatment. So the correct answer is laser peripheral iridotomy.

**Core Concept**
Angle-closure glaucoma occurs due to mechanical obstruction of the trabecular meshwork by the iris. Prophylactic treatment of the unaffected (fellow) eye is critical to prevent acute angle closure, as anatomical predisposition is bilateral in 50–70% of cases.

**Why the Correct Answer is Right**
Laser peripheral iridotomy (LPI) is the definitive prophylactic treatment for the fellow eye. It creates a small hole in the iris, allowing aqueous humor to bypass the obstructed angle and equalize pressure between anterior and posterior chambers. This prevents pupillary block, the primary mechanism of angle closure. LPI is preferred over medical therapy for long-term prevention due to its efficacy and minimal systemic risks.

**Why Each Wrong Option is Incorrect**
**Option A:** Topical beta-blockers (e.g., timolol) reduce aqueous production but do not address anatomical closure. They are used for acute IOP control, not prophylaxis.
**Option B:** Mydriatics (e.g., tropicamide) worsen angle closure by dilating the pupil, pulling the iris forward and narrowing the angle.
**Option D:** Trab

✓ Correct Answer: C. Laser iridectomy