Is Cataract Surgery Safe?

Yes. Modern cataract surgery is generally a safe and highly successful procedure, but no surgery is completely risk-free.

During cataract surgery, the cloudy natural lens is removed and replaced with an artificial intraocular lens (IOL). The procedure involves delicate structures of the eye, so complications can occur even when surgery is performed correctly.

The majority of patients do not develop serious complications, but patients should understand the possible risks before surgery.

What Are the Common Risks of Cataract Surgery?

Potential complications and side effects include:

  • Temporary blurred vision
  • Mild eye irritation or discomfort
  • Redness
  • Dry eye symptoms
  • Inflammation
  • Corneal swelling
  • Increased eye pressure
  • Posterior capsule opacification
  • Residual refractive error
  • Cystoid macular edema
  • Retinal tears or retinal detachment
  • Infection inside the eye
  • Bleeding
  • Rarely, significant or permanent loss of vision

Not every patient has the same risk, and some complications are more common than others.

1. Infection After Cataract Surgery

A serious but uncommon complication is endophthalmitis, an infection inside the eye.

It can cause:

  • Increasing eye pain
  • Severe redness
  • Worsening vision
  • Swelling
  • Discharge
  • Increasing sensitivity to light

Because infection can threaten vision, sudden worsening of vision, significant pain or increasing redness after cataract surgery requires urgent ophthalmic assessment.

Following your surgeon’s instructions regarding eye drops, hygiene and post-operative care can help reduce infection risk.

2. Inflammation After Cataract Surgery

Some inflammation is a normal part of the healing process.

However, excessive or persistent inflammation may require additional treatment.

Your ophthalmologist may prescribe anti-inflammatory eye drops after surgery to control inflammation.

Patients should use prescribed medication exactly as instructed and attend scheduled follow-up appointments.

3. Increased Eye Pressure

Eye pressure can temporarily increase after cataract surgery.

For some patients, particularly those with glaucoma or other risk factors, pressure may require monitoring or treatment.

Your ophthalmologist may check intraocular pressure during follow-up visits.

4. Corneal Swelling

The cornea can become temporarily swollen after cataract surgery.

This may cause:

  • Blurred vision
  • Hazy vision
  • Halos
  • Light sensitivity

In many cases, the swelling improves as the eye heals. Patients with pre-existing corneal conditions may have a greater risk of prolonged corneal edema.

5. Posterior Capsule Opacification (PCO)

Posterior capsule opacification (PCO) is sometimes called a “secondary cataract,” although it is not a cataract returning.

After cataract surgery, the thin membrane supporting the IOL can become cloudy over time.

Symptoms may include:

  • Blurred vision
  • Glare
  • Reduced contrast
  • Difficulty seeing clearly

PCO can usually be treated with a YAG laser capsulotomy, which creates an opening in the cloudy capsule to restore the passage of light.

6. Cystoid Macular Edema

Cystoid macular edema (CME) occurs when fluid accumulates in the macula following surgery.

The macula is the central part of the retina responsible for detailed vision.

CME may cause:

  • Blurred central vision
  • Distorted vision
  • Reduced visual clarity

The risk may be higher in patients with diabetes, uveitis or certain other eye conditions.

Treatment depends on the cause and severity and may include anti-inflammatory medication.

7. Retinal Tear or Retinal Detachment

Retinal problems are an uncommon but potentially serious complication following cataract surgery.

A retinal detachment occurs when the retina separates from the underlying tissue.

Warning symptoms include:

  • Sudden increase in floaters
  • Flashes of light
  • A dark curtain or shadow moving across the vision
  • Sudden reduction in vision

These symptoms require urgent eye examination.

8. Residual Refractive Error

Even with modern biometry and IOL calculations, a patient may have some remaining refractive error after cataract surgery.

This can result in:

  • Blurred distance vision
  • Blurred near vision
  • Astigmatism
  • Dependence on spectacles

The likelihood depends on factors such as the accuracy of measurements, IOL calculation, corneal characteristics and individual healing.

In selected patients, residual refractive error can be managed with spectacles, contact lenses or additional refractive procedures.

9. IOL-Related Problems

The artificial lens implanted during cataract surgery is designed to remain stable inside the eye.

Rarely, an IOL may become:

  • Decentered
  • Tilted
  • Dislocated
  • Incorrectly positioned

Some IOL-related problems may require additional surgical management.

The risk can depend on the strength of the supporting structures of the eye and other surgical or anatomical factors.

10. Dry Eye After Cataract Surgery

Some patients experience temporary dry-eye symptoms following cataract surgery.

Symptoms may include:

  • Burning
  • Grittiness
  • Fluctuating vision
  • Watering
  • Foreign-body sensation
  • Redness

Patients with pre-existing dry eye may experience more noticeable symptoms.

Treating the ocular surface before and after surgery can be important for patients with significant dry eye, especially when premium IOLs are being considered.

11. Glare and Halos After Cataract Surgery

Some patients experience glare, halos or starbursts after cataract surgery.

These symptoms can be associated with:

  • IOL design
  • Residual refractive error
  • Corneal abnormalities
  • Dry eye
  • Pupil size
  • Other optical factors

Patients receiving multifocal or other presbyopia-correcting IOLs should understand that optical phenomena such as halos and glare may occur.

A detailed pre-operative discussion is particularly important for patients who frequently drive at night.

12. Posterior Vitreous Detachment and Floaters

Changes in the vitreous gel can occur around the time of cataract surgery.

Some patients may notice new floaters or flashes.

Although many such changes are harmless, new flashes or a sudden increase in floaters should be evaluated promptly, because they can sometimes be associated with a retinal tear or retinal detachment.

Who Has a Higher Risk of Cataract Surgery Complications?

Cataract surgery risk is not the same for every patient.

The risk may be affected by:

Existing eye conditions

  • Glaucoma
  • Diabetic retinopathy
  • Macular disease
  • Corneal disease
  • Uveitis
  • Retinal problems
  • Severe dry eye

Previous eye surgery

Patients who have previously undergone LASIK, PRK, glaucoma surgery, retinal surgery or other eye procedures may require additional assessment.

Medical conditions

Conditions such as diabetes can affect the eye and may influence surgical planning and recovery.

Complicated or advanced cataracts

Very dense or complicated cataracts may require more complex surgical planning.

Weakness of the lens-supporting structures

Certain patients may have weaker zonules or other anatomical factors that can make surgery more challenging.

How Can You Reduce the Risk of Cataract Surgery Complications?

Although complications cannot be completely eliminated, several measures can improve safety.

Before surgery

  • Have a comprehensive eye examination.
  • Inform your surgeon about all existing eye conditions.
  • Tell your surgeon about previous eye surgeries.
  • Discuss diabetes and other relevant medical conditions.
  • Complete recommended pre-operative tests.
  • Ensure accurate IOL measurements.
  • Discuss your visual expectations.

After surgery

  • Use prescribed eye drops correctly.
  • Do not rub the operated eye.
  • Keep the eye protected from injury.
  • Attend follow-up appointments.
  • Follow instructions regarding exercise and heavy lifting.
  • Avoid swimming until your surgeon permits it.
  • Report unusual or worsening symptoms promptly.

Is Cataract Surgery Riskier for Older Patients?

Age alone does not determine whether cataract surgery is safe.

Older patients may have a higher likelihood of other eye conditions or medical conditions that can affect the surgical plan.

The surgeon should assess the overall health of the eye rather than making a decision based solely on age.

Does Diabetes Increase Cataract Surgery Risks?

Diabetes can affect the retina and macula and may influence cataract surgery outcomes.

Patients with diabetes should have an appropriate retinal evaluation before surgery.

Good management of diabetes and careful monitoring of the retina can be important before and after cataract surgery.

Can Cataract Surgery Cause Blindness?

Severe permanent vision loss after routine cataract surgery is uncommon, but it is a possible complication.

Serious complications such as severe infection, retinal complications, uncontrolled inflammation or other problems can potentially cause significant vision loss.

This is why patients should understand the risks and seek urgent medical attention if they experience warning symptoms after surgery.

What Symptoms Are Not Normal After Cataract Surgery?

Some mild symptoms are expected during early healing.

However, contact your ophthalmologist promptly if you experience:

  • Severe or increasing eye pain
  • Sudden reduction in vision
  • Vision that becomes progressively worse
  • Increasing redness
  • Significant discharge
  • New flashes of light
  • Sudden increase in floaters
  • A curtain or shadow across your vision
  • Significant swelling
  • Severe light sensitivity

Do not wait for your next routine appointment if you develop sudden or severe symptoms.

Cataract Surgery Risks: What Should You Ask Your Surgeon?

Before cataract surgery, consider asking:

  1. What type of cataract do I have?
  2. Are there any conditions that increase my surgical risk?
  3. Which IOL is appropriate for my eyes?
  4. Do I have significant astigmatism?
  5. Do I need a retinal or corneal evaluation?
  6. What vision should I realistically expect?
  7. Will I still need glasses?
  8. What complications are particularly relevant to me?
  9. What symptoms should make me contact you urgently?
  10. What activities should I avoid during recovery?

A personalized discussion is more useful than relying on general statistics alone.

Cataract Surgery Risks: Frequently Asked Questions

1. Is cataract surgery safe?

Yes. Modern cataract surgery is generally safe and effective, but like every surgical procedure, it has potential risks and complications.

2. What are the most common complications of cataract surgery?

Possible complications include inflammation, temporary blurred vision, corneal swelling, increased eye pressure, dry eye symptoms, posterior capsule opacification and residual refractive error. Serious complications such as infection or retinal detachment are less common.

3. Can cataract surgery cause permanent vision loss?

Severe permanent vision loss is uncommon, but serious complications can potentially cause significant or permanent loss of vision. Prompt treatment is important if warning symptoms occur.

4. Can cataracts come back after surgery?

A cataract itself does not return because the cloudy natural lens has been removed. However, posterior capsule opacification can develop later and cause vision to become cloudy again. It can generally be treated with YAG laser capsulotomy.

5. Is pain normal after cataract surgery?

Mild irritation or discomfort can occur during recovery. Severe or increasing pain is not something to ignore and should be assessed promptly.

6. Is blurred vision normal after cataract surgery?

Mild blurred vision can occur during early recovery. Vision should generally improve. Sudden or worsening vision requires prompt assessment.

7. Can cataract surgery cause retinal detachment?

Retinal detachment is an uncommon but potentially serious complication. New flashes, a sudden increase in floaters or a curtain-like shadow over the vision require urgent evaluation.

8. Can cataract surgery increase eye pressure?

Yes. Eye pressure can temporarily increase after surgery, and some patients may require monitoring or treatment, particularly those with glaucoma or other risk factors.

9. Can cataract surgery cause dry eyes?

Some patients experience temporary dry-eye symptoms after surgery. Patients with pre-existing dry eye may be more symptomatic.

10. How can I reduce the risks of cataract surgery?

Have a thorough pre-operative assessment, disclose previous eye surgery and medical conditions, choose an appropriate IOL, follow your surgeon’s medication and aftercare instructions and attend all scheduled follow-ups.