---
title: Posterior capsular opacification
description: "[Posterior capsular opacification PCO](https://bluefinvision.com/blog/understanding-posterior-capsular-opacification-a-comprehensive-guide/) is a common cause of cloudy vision months or years after cataract surgery. It occurs when the thin membrane behind the implant becomes hazy. ## Symptoms and cause PCO is sometimes called a \"secondary cataract\", although…"
url: "https://bluefinvision.com/knowledge-base/topics/conditions-diseases/posterior-capsular-opacification/"
updated: "2026-01-22"
category: "Conditions & Diseases"
---

# Posterior capsular opacification

[Posterior capsular opacification PCO](https://bluefinvision.com/blog/understanding-posterior-capsular-opacification-a-comprehensive-guide/) is a common cause of cloudy vision months or years after cataract surgery. It occurs when the thin membrane behind the implant becomes hazy.

## Symptoms and cause

PCO is sometimes called a "secondary cataract", although the original lens has already been removed.

- Gradual blur, glare, and halo around lights similar to the original cataract
- Caused by leftover lens cells thickening and wrinkling the capsule
- Does not usually cause pain or redness
- Detected easily during a slit-lamp examination

## Treatment

A quick laser procedure can restore clarity in most cases. Vision often improves rapidly.

- YAG laser capsulotomy creates a small opening in the hazy capsule
- Usually done in clinic with drops and no need for stitches
- Risks are low but include temporary pressure rise and floaters
- Most patients notice clearer, brighter vision within days