---
title: YAG laser peripheral iridotomy
description: "[YAG laser peripheral iridotomy](https://bluefinvision.com/blog/what-is-yag-laser-iridotomy/) creates a tiny opening in the coloured part of the eye to improve fluid flow. It is commonly used to treat or prevent angle-closure glaucoma. ## Why the procedure is done In narrow or closed angles,…"
url: "https://bluefinvision.com/knowledge-base/topics/treatments-procedures/yag-laser-peripheral-iridotomy/"
updated: "2026-01-22"
category: "Treatments & Procedures"
---

# YAG laser peripheral iridotomy

[YAG laser peripheral iridotomy](https://bluefinvision.com/blog/what-is-yag-laser-iridotomy/) creates a tiny opening in the coloured part of the eye to improve fluid flow. It is commonly used to treat or prevent angle-closure glaucoma.

## Why the procedure is done

In narrow or closed angles, fluid cannot drain properly, leading to sudden or chronic pressure rises. The small hole forms a bypass route.

- Relieves pupil block where the iris bows forward against the lens
- Helps open the drainage angle in eyes at risk of acute attacks
- Often recommended for the second eye as a precaution
- May be combined with other treatments such as lens surgery

## What to expect and possible effects

The laser is usually done in clinic with numbing drops. Most people tolerate it well.

- Temporary light sensitivity, redness, or ache are common afterwards
- Pressure is checked shortly after the procedure and at follow-up
- Some patients notice small ghost images or glare that often fade
- Drops may continue long term if pressure remains high despite the iridotomy