Narrow Angle Glaucoma: Causes, Risks, and What You Need to Know

When the drainage angle in your eye gets blocked, narrow angle glaucoma, a type of glaucoma where fluid can’t drain properly, causing sudden spikes in eye pressure. Also known as acute angle-closure glaucoma, it’s not a slow burner—it’s an eye emergency that can blind you in hours if untreated. Unlike the more common open-angle type, this form doesn’t creep up. It strikes fast, often without warning.

People with shallow front chambers, farsightedness, or Asian or Inuit ancestry are more likely to develop it. Certain medications—like antihistamines, decongestants, or even some antidepressants—can trigger an attack in those already at risk. Think of your eye like a sink: if the drain is narrow, even a small blockage can cause a backup. That backup is intraocular pressure, the fluid pressure inside the eye that, when too high, damages the optic nerve. And once that nerve is damaged, you can’t get your vision back.

Symptoms? Blurry vision, halos around lights, severe eye pain, headache, nausea, and sudden vision loss. If you feel this, don’t wait. Go to the ER. Delaying treatment by even a few hours can mean permanent damage. Doctors use laser iridotomy to open the blocked angle—it’s quick, outpatient, and often prevents future attacks. But prevention starts with knowing your risk. If you’re over 40, have family history, or take medications that affect eye drainage, get a comprehensive eye exam. Regular checkups catch narrow angles before they turn into emergencies.

This collection of articles covers what you need to know about managing eye conditions, drug interactions that affect vision, and how medications like those for depression or thyroid issues can silently impact your eyes. You’ll find real-world advice on spotting warning signs, avoiding dangerous combos, and understanding how common prescriptions can play a role in eye health. Whether you’re worried about your own vision or helping someone else, these posts give you the facts without the fluff.