Cataract surgery is one of the safest surgical procedures performed today. Over 90% of patients achieve 20/20 vision with glasses afterward, and the rate of serious complications like infection sits below 0.1%. That said, no surgery is completely without risk, and understanding what can go wrong helps you weigh the decision with confidence.
How Safe the Numbers Really Are
Cataract surgery has been refined over decades, and the complication profile reflects that. A large study of Medicare patients found that the infection rate after cataract surgery alone was 0.08%, the lowest of any intraocular surgery. For context, corneal transplants had an infection rate more than five times higher (0.43%), and glaucoma surgeries came in at 0.16%. Cataract surgery sits at the bottom of the risk scale.
The procedure itself typically takes 15 to 20 minutes. You’re awake the entire time under local anesthesia with mild sedation through an IV. Most people notice improved vision within a few days, and full recovery takes about four weeks.
Minor Complications That Usually Resolve
The most common issues after cataract surgery are temporary and treatable. Some degree of inflammation is expected as the eye heals. In a small percentage of patients (roughly 0.1% to 2%), this inflammation becomes persistent or leads to swelling in the central part of the retina, called macular edema. When this happens, it typically responds well to anti-inflammatory eye drops, and your surgeon will monitor it at follow-up visits over the next several weeks.
Nausea after surgery is fairly common but has nothing to do with the eye itself. It’s a side effect of the IV sedation and usually clears within a day or two. Some people also experience temporary dryness, light sensitivity, or a gritty feeling in the eye during the healing period.
Rare but Serious Risks
The complication that eye surgeons take most seriously is endophthalmitis, a bacterial infection inside the eye. It can threaten vision if not caught early, but it occurs in fewer than 1 in 1,000 cataract surgeries. Preventive antibiotic drops before and after surgery have driven this rate down significantly over the years.
Retinal detachment is another rare possibility. The symptoms to watch for in the days and weeks after surgery include sudden flashes of light, a shower of new floaters, or a shadow creeping across your vision. These warrant an immediate call to your surgeon. Eye pain, increasing redness, worsening vision, or unusual discharge are also signals that something needs attention.
Posterior Capsule Clouding
One issue that catches many patients off guard isn’t really a complication of surgery at all, but it’s worth knowing about. During cataract surgery, your natural lens is removed but the thin capsule that held it stays in place to support the new artificial lens. Over time, that capsule can become cloudy, causing vision to blur again in a way that feels like the cataract has returned.
This happens in roughly 12% of patients within the first year and about 28% within five years. The fix is a quick, painless laser procedure done in your doctor’s office that takes only a few minutes and restores clear vision. It’s a one-time treatment, and the clouding doesn’t come back.
Who Faces Higher Risk
Certain health conditions can increase the chance of complications. Diabetes is the most significant factor. If you have diabetic retinopathy, you’re at higher risk for retinal swelling after surgery. Your surgeon may want your blood sugar well controlled before scheduling the procedure, and they’ll monitor your recovery more closely.
People with glaucoma face a higher chance of elevated eye pressure after surgery, which may require additional drops or adjustments to their existing glaucoma treatment. Having both conditions doesn’t mean surgery is off the table. It means your surgeon will plan around those risks.
Very dense or advanced cataracts can also make the procedure technically more challenging, which is one reason ophthalmologists often recommend not waiting too long once a cataract starts affecting daily life.
Laser vs. Traditional Surgery
You may have heard about laser-assisted cataract surgery as a newer, potentially safer option. In this approach, a laser handles some of the steps that a surgeon would otherwise do by hand. It sounds like it should be better, but the data tells a more nuanced story.
Head-to-head comparisons published by the American Academy of Ophthalmology found no significant differences in visual outcomes between laser-assisted and traditional surgery. Complication rates were also comparable, with no meaningful difference in damage to the cells lining the cornea through six months of follow-up. Laser-assisted surgery does cost more, often with out-of-pocket fees, so the choice comes down more to preference and your surgeon’s recommendation than to a clear safety advantage.
What Recovery Looks Like
Most people return to normal activities within a few days, though you’ll need to avoid rubbing your eye, swimming, and heavy lifting for a few weeks. Your surgeon will prescribe anti-inflammatory and antibiotic eye drops to use on a schedule that typically tapers off over four to six weeks. Follow-up appointments are usually scheduled within the first day or two, then again around six weeks out to confirm the eye has healed fully.
The signs that should prompt an immediate call to your eye doctor: increasing pain or redness, vision that gets worse instead of better, new floaters or flashes of light, and any crusting or discharge that seems abnormal. These don’t necessarily mean something has gone wrong, but they need to be evaluated quickly to rule out infection or other treatable problems.