Cataract surgery is one of the safest and most commonly performed procedures in medicine, but it does carry real disadvantages worth understanding before you decide to proceed. Serious complications are rare, affecting fewer than 1 in 50 patients in most categories, yet milder issues like dry eye, visual disturbances, and the need for follow-up procedures are surprisingly common. Here’s what the risks actually look like.
Visual Disturbances After Surgery
One of the most frequently reported downsides is dysphotopsia, a catch-all term for unwanted visual effects like glare, halos around lights, and shadowy crescents in your peripheral vision. Up to 49% of patients experience some degree of these symptoms in the early weeks after surgery. For most people they fade as the brain adapts, but a small percentage find them persistent and bothersome, especially when driving at night.
The type of lens implant you receive matters here. Multifocal and extended depth-of-focus lenses, which aim to reduce your dependence on glasses, are more likely to cause halos, starbursts, and glare around light sources. These effects come from the way the lens splits light to provide both near and distance vision. Standard single-focus lenses produce fewer of these issues but typically mean you’ll still need reading glasses.
Dry Eye Is Common but Usually Temporary
About 1 in 10 patients develops clinically significant dry eye within the first week after surgery. Symptoms include grittiness, burning, blurred vision, and a feeling that something is in your eye. The severity tends to peak around day seven and then gradually improves over one to three months. The surgery itself disrupts nerves on the surface of the cornea, which temporarily reduces your eye’s ability to maintain its tear film.
If you already have dry eye before surgery, there’s a good chance it will get worse for a stretch. Most surgeons recommend starting lubricating drops before and after the procedure to minimize discomfort during recovery.
Your Vision May Not Hit the Target
Before surgery, your doctor uses measurements of your eye to select a lens implant aimed at a specific prescription target, usually clear distance vision. But roughly 3 to 10% of surgeries result in what’s called a refractive surprise, meaning your post-operative vision lands more than one diopter away from what was planned. One large analysis put the rate at about 6%. In practical terms, this means you might end up more nearsighted or farsighted than expected and need glasses, contact lenses, or occasionally a second procedure to correct the error.
Eyes that have previously had LASIK or other refractive surgery, or eyes with unusual shapes, are harder to measure accurately and face a higher chance of this outcome.
Secondary Cataracts Affect Up to Half of Patients
This is perhaps the most underappreciated disadvantage. Between 20% and 50% of patients develop posterior capsule opacification within two to five years of surgery. The thin membrane left behind to support the new lens gradually clouds over, causing vision to blur again in a way that feels like the cataract is coming back. It can show up as early as a few months after surgery or take several years.
The fix is a quick laser procedure that takes a few minutes in the office, and it’s generally effective. But it’s still an additional procedure with its own small risks, and many patients aren’t warned about the likelihood beforehand.
Swelling in the Back of the Eye
Cystoid macular edema, or swelling of the central retina, is one of the more common causes of disappointing vision after an otherwise smooth surgery. Clinically significant cases occur in roughly 0.1% to 2.4% of patients, though more sensitive imaging picks up subtle swelling in a much higher percentage. Most cases respond to anti-inflammatory eye drops over several weeks, but a small number resist treatment and can lead to permanently reduced central vision.
Rare but Serious Complications
Infection inside the eye (endophthalmitis) is the complication surgeons worry about most. It occurs in fewer than 3 in 10,000 surgeries and requires urgent treatment to prevent severe vision loss. Symptoms typically appear within the first week: increasing pain, redness, and rapidly worsening vision.
Retinal detachment is another low-probability but high-stakes risk. It can occur weeks to months after surgery. Warning signs include a sudden shower of floaters, flashes of light, or a shadow creeping across your vision. If you notice any of these, it’s an emergency.
Over the very long term, the artificial lens itself can shift out of position. A population-based study tracking patients for 25 years found the cumulative risk of lens dislocation was 0.1% at 10 years, rising to 1.7% at 25 years. People with certain conditions that weaken the fibers holding the lens in place, such as pseudoexfoliation syndrome, face a higher risk. A dislocated lens usually requires a second surgery to reposition or replace it.
Recovery Restrictions
Cataract surgery is an outpatient procedure, and most people notice better vision within a day or two. But the recovery period comes with a list of restrictions that can be inconvenient. For the first 48 hours, you need to avoid bending over or putting your head below your waist, as this increases pressure inside the eye. You’ll likely wear a protective shield over the eye while sleeping for several nights.
Light walking is fine the next day, but more vigorous activities like running, golf, cycling, and sex require a 7- to 10-day wait. Swimming is off-limits for at least two weeks to avoid infection. You can shower the day after surgery but need to keep water from hitting the eye directly. If you’ve had surgery on only one eye, the difference in vision between your two eyes during the weeks before your second surgery can feel disorienting.
Costs Beyond What Insurance Covers
Standard cataract surgery with a basic single-focus lens is covered by Medicare and most insurance plans, but you’ll still owe a share. Under Medicare Part B, you pay 20% of the approved amount for both the surgeon’s fee and the facility fee after meeting your annual deductible. Depending on your location and surgeon, this can add up to several hundred dollars per eye.
The bigger financial surprise comes if you want a premium lens. Multifocal, extended depth-of-focus, and astigmatism-correcting lenses are considered upgrades, and insurance typically covers only the amount it would have paid for a standard lens. You pay the difference out of pocket, which can range from $1,000 to $3,000 or more per eye. Laser-assisted surgery, which some surgeons recommend for more precise incisions, often carries a similar upcharge. These costs aren’t always discussed upfront, so it’s worth asking specifically what your plan will and won’t cover before scheduling.
Higher Risks With Certain Health Conditions
Diabetes complicates cataract surgery in several ways. People with diabetes develop cataracts earlier and more frequently, but the surgery itself can worsen diabetic eye disease. In patients who already have diabetic macular edema (swelling in the retina from diabetes), nearly 50% of eyes showed some worsening of that swelling after cataract surgery in one study, even though average visual acuity still improved overall. These patients often need additional injections before and after surgery to keep the swelling in check, adding both cost and visits.
Glaucoma, prior eye surgeries, and conditions affecting the structural support inside the eye also raise complication rates. None of these necessarily rule out surgery, but they shift the risk-benefit balance and may change the surgical approach your doctor recommends.