Why Some Patients See Halos After Cataract Surgery

Quick answer: Seeing halos around lights after cataract surgery is common and almost always temporary. There are three main causes: your brain adjusting to clearer vision, a small glasses-prescription change, or posterior capsule opacification (PCO), which is corrected in minutes with a YAG laser.

Cataract surgery has a very high success rate, and most side effects fade in the weeks after surgery. Here's why halos happen and what's done about each cause. For the full recovery timeline, see the healing stages of cataract surgery.

The three reasons you might see halos

1. Visual adjustment

Cataracts form over years, and your brain slowly adapts to the dimming, scattered light. Once the cataract is removed, the brain needs time to readjust to the restored, clearer light, which can briefly cause halos. This is the most common reason, slightly more likely with advanced (premium) IOLs, and it usually settles within a few weeks.

2. Residual refractive error

If you need glasses after surgery (common with a monofocal IOL), an out-of-date prescription can cause halos. You typically won't get a new prescription until about eight weeks post-op, once the eye has healed. After that, halos from this cause usually disappear.

3. Posterior capsule opacification (PCO)

Sometimes mislabeled a "second cataract" (a real cataract can't return), PCO is when proteins cloud the capsule holding your new lens, scattering light and causing halos. It can appear months to years later and affects a sizable share of patients. The fix is a quick, painless in-office YAG laser treatment. See blurry vision after cataract surgery for more on PCO.

When to mention halos to your doctor

Report any new halos to your ophthalmologist so they can check whether it's simple adjustment, a prescription change, or PCO. Each is straightforward to address.

Cataract care at West Boca Eye Center

At West Boca Eye Center in Boca Raton, board-certified ophthalmologist Dr. Brent Bellotte and our team keep you informed at every step. Learn more about cataract surgery or book a consultation.