What Is PCO?

After lens replacement or cataract surgery, your natural lens has been replaced with a clear artificial lens called an intraocular lens (IOL). The eyes natural bag, which held your natural lens, remains in place and is a thin, transparent membrane.  This bag now houses the new lens. Over time, some leftover cells can grow and form a cloudy layer on this capsule, or it can become wrinkled. This condition is called posterior capsule opacification (PCO).

Why Does It Happen?

PCO occurs because residual epithelial cells multiply and migrate across the capsule, creating a hazy film or the capsule bag itself can retract and wrinkle. This can interfere with light passing through the eye, making vision blurry again.

PCO is the most frequent long-term complication of cataract surgery, experienced by around 20–25% of patients developing from 3 months to 5 years post-surgery.

Symptoms can include:

• Gradual blurring or haziness of vision
• Increased glare or halos around lights
• Difficulty reading or reduced contrast sensitivity

If you notice these changes months or years after cataract surgery, PCO might be the cause.  However, there is a simple, pain-free outpatient solution to this issue.

YAG Laser Capsulotomy

A YAG laser (short for yttrium-aluminum-garnet) is a highly precise medical laser. It’s used to create a tiny opening in the cloudy capsule behind your lens implant, restoring the clear pathway for light to reach your retina

Further to a brief examination with scans of the eye and a vision check, dilating drops are used to increase the size of the pupil.  You will need to arrange transport home as your vision will be blurry for a few hours from dilation.

The procedure is performed in by a consultant in clinic and usually takes around 5-10 minutes. You’ll sit at a slit lamp (similar to a regular eye exam) and numbing drops are applied; a special lens may be placed on your eye to help focus the laser.

The YAG laser makes a small opening in the capsule, which is painless.

After the procedure your eye pressure will be checked before you leave and vision often improves within hours, though full clarity may take a day or two.

Many patients notice an increased number of floaters for a few weeks as capsule fragments settle but can return to normal activities the next day.

If you are experiencing issues with your vision, post lens replacement surgery or feel as though a cataract has returned, this may be due to PCO (posterior capsular opacification). YAG laser treatment can correct these symptoms in one straightforward procedure. A consultation with one of our ophthalmologists can help restore your vision.