Cataract surgery removes the eye’s naturally clouded lens and replaces it with a clear artificial one Cataract surgery is a procedure that removes the cloudy natural lens of the eye and replaces it with an artificial intraocular lens (IOL) to improve vision. It is usually a safe, short procedure performed under local or topical anaesthesia, with most patients experiencing little or no pain.
Cataract Surgery: What It Is, How It’s Done, and What to Expect
Cataract surgery is the most commonly performed surgery in the world — and for good reason. It’s safe, quick, and consistently restores vision that’s been quietly fading for months or years. Yet most patients I see arrive with a mix of relief that something can be done, and uncertainty about what actually happens on the day.
I’ve been doing this procedure and counselling patients through it for over two decades, across public hospitals and private practice. In this article, I’ll walk you through what a cataract actually is, how the surgery works, what your lens options are, and what to expect from surgery day through full recovery.
Quick Answer: Cataract surgery removes the eye’s naturally clouded lens and replaces it with a clear artificial one (an intraocular lens, or IOL). It’s done under local anaesthesia, usually takes 10–15 minutes per eye, and most patients go home the same day and notice sharper vision within 24–48 hours.
Signs You May Need Cataract Surgery
A cataract develops gradually, so many patients don’t realise how much vision they’ve lost until it’s pointed out. These are the signs worth acting on.
| Symptom | What It Means | What To Do About It |
|---|---|---|
| Blurred or hazy vision, even with updated glasses | The eye’s natural lens has clouded, so glasses can no longer sharpen the image | Get a dilated eye exam to confirm cataract and check its stage |
| Increasing glare or halos around headlights and lamps | Light scatters through a clouded lens instead of focusing cleanly | Avoid night driving if glare is significant; discuss timing of surgery |
| Colours looking faded or yellowed | The lens is yellowing, filtering out blue and violet light | Compare your vision eye-to-eye; this is a classic early cataract sign |
| Frequent changes in your glasses prescription | The cataract itself is altering how light bends through the eye, not just ageing vision | Mention this pattern specifically to your ophthalmologist |
| Double vision in one eye | Can occur when the cataract is uneven or off-centre in the lens | Needs an eye exam to rule out other causes as well |
| Difficulty reading, cooking or recognising faces | Vision loss has crossed into affecting daily function | This is usually the trigger point most surgeons use to recommend surgery |
How Cataract Surgery Works
The standard modern technique is called phacoemulsification. Through a tiny incision (usually under 3 mm, needing no stitches), your surgeon uses ultrasound energy to gently break up the clouded lens and remove it. A folded artificial lens is then inserted through the same incision and unfolds into place inside the eye.
The whole procedure typically takes 10–15 minutes per eye. You’re awake throughout, under local (not general) anaesthesia — you can read more about exactly what that feels like in Is Cataract Surgery Painful?. Most patients go home within a couple of hours of finishing.
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Types of Intraocular Lenses (IOLs)
Choosing your replacement lens is one of the more important decisions in this process, since it affects how much you’ll depend on glasses afterward.
| Lens Type | What It Means For You | What To Discuss With Your Surgeon |
|---|---|---|
| Monofocal IOL | Provides clear vision at one distance (usually far); reading glasses are typically still needed | Whether you’d rather prioritise distance or near vision |
| Multifocal IOL | Designed to give clear vision at multiple distances, reducing dependence on glasses | Ask about glare/halo trade-offs, especially for night driving — see [Multifocal Lenses] |
| Toric IOL | Corrects significant astigmatism at the same time as the cataract | Whether your astigmatism is significant enough to need this |
| Extended depth-of-focus (EDOF) IOL | A middle ground — a continuous range of clear vision with fewer visual side effects than some multifocals | Discuss if you want reduced glasses dependence without maximal multifocal trade-offs |
| Monovision approach (monofocal, set differently per eye) | One eye set for distance, one for near, so the brain blends the two | Ask whether you tolerate monovision well — some people find it takes adjustment |
Home Preparation Before Cataract Surgery
- Arrange for someone to drive you home — you won’t be fit to drive yourself
- Start any prescribed antibiotic drops exactly on the schedule given
- Confirm with your surgeon which regular medications (especially blood thinners) need adjusting beforehand
- Wear comfortable, easy-to-remove clothing on the day; avoid make-up or lotion around the eyes
- Plan for a quiet 24–48 hours afterward — avoid scheduling anything demanding the same day
What Cataract Surgery Recovery Looks Like
Most people notice a real improvement in vision within a day, though full stabilisation takes a few weeks as the eye settles and any residual swelling clears.
- Day 1–2: Mild grittiness, watering or light sensitivity is normal; vision may still feel slightly hazy
- Week 1: Vision continues sharpening; drops (antibiotic-steroid combination) continue as prescribed
- Weeks 2–4: Vision typically stabilises enough for a final glasses prescription, if one is still needed
- Follow-up visits are usually scheduled at day 1, week 1, and around week 4 to confirm healing is on track
When To See a Doctor
Call your surgeon the same day, don’t wait for your next follow-up, if you notice:
- Sudden or severe pain not settling with prescribed medication
- Redness that’s worsening instead of improving
- Discharge, especially thick, yellow or green
- A sudden drop in vision, or new flashes and floaters
- Increasing halos around lights, rather than gradually improving ones
- Fever alongside eye symptoms
Frequently Asked Questions
How do I know if I’m ready for cataract surgery?
There’s no single “ripeness” threshold anymore — surgery is usually recommended once the cataract starts interfering with daily tasks like reading, driving, or recognising faces, regardless of your age.
Is cataract surgery safe?
Yes — it’s one of the safest and most frequently performed surgeries worldwide, with a very high success rate for restoring vision. As with any surgery, a small risk of complications like infection or inflammation exists, which is why post-operative drops and follow-up visits matter.
Can both eyes be done at the same time?
Most surgeons, myself included, prefer to operate on one eye first, confirm it’s healing well, and then do the second eye at least a week or two later — this keeps at least one functioning eye throughout recovery and reduces combined risk.
Will I still need glasses after cataract surgery?
It depends on the lens you choose. A standard monofocal lens usually still needs reading glasses; multifocal, EDOF or toric lenses can reduce — though rarely eliminate entirely — your dependence on glasses.
How long does the vision improvement last?
The artificial lens itself doesn’t wear out or need replacing. Some patients develop a treatable clouding of the membrane behind the lens years later (posterior capsule opacification), which is corrected with a quick, painless laser procedure, not repeat surgery.
What happens if I delay cataract surgery?
A cataract doesn’t damage the eye by simply being left, but it will keep affecting your vision and daily function over time. In advanced stages it can also make surgery itself more complex, which is why most surgeons recommend not waiting until vision is severely impaired.
Key Takeaways
- Cataract surgery replaces the eye’s clouded natural lens with a clear artificial one (IOL)
- The standard technique, phacoemulsification, takes 10–15 minutes per eye under local anaesthesia
- Lens choice (monofocal, multifocal, toric, EDOF) shapes your glasses dependence afterward
- Most patients see improvement within 24–48 hours, with full stabilisation over a few weeks
- Eyes are usually done one at a time, a week or two apart
- Worsening pain, redness, discharge or vision changes after surgery need same-day attention
Book a Consultation
If a cataract is starting to affect your daily life, or you’d like a clear explanation of which lens option suits you, I’m happy to walk you through your options and a personalised surgical plan.
A second opinion before cataract surgery can help confirm whether surgery is appropriate, clarify your lens options, and ensure that other eye conditions that may affect the visual outcome have been considered.
Book an Appointment →
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This article is part of the Cataract Hub. Read more Cause of cataract, Cataract Surgery, Cataract Surgery Does Not Protect You From Glaucoma, Femtosecond Laser Cataract Surgery: Contraindications, Femtosecond Laser-Assisted Cataract Surgery, Cataract Surgery , Cataract in Glaucoma Patients, Is Cataract Surgery Painful?, Vision Not Clear After Cataract Surgery? What It Really Means, Second opinion Before Cataract Surgery, Which Lens is Best for Cataract Surgery, and Premium Lenses for Cataract Surgery in Gurgaon.
You can also watch these videos to understand more, here and here
About the Author
This article was written by Dr Shibal Bhartiya, fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator, Clinical Director at Marengo Asia Hospitals, Gurugram, known for ethical, patient-centred glaucoma care and independent glaucoma second opinions. She is also the Program Director for Community Outreach & Wellness; and for the Marengo Asia International Institute of Neuro and Spine.
She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.
As Editor-in-Chief of Clinical and Experimental Vision and Eye Research and Executive Editor of the Journal of Current Glaucoma Practice (Pubmed Indexed, official journal of the International Society of Glaucoma Surgery), Dr Shibal Bhartiya brings editorial and research depth to every clinical decision. Her 200+ publications, including 90+ PubMed-indexed publications and 28 edited textbooks span glaucoma biology, surgical outcomes, health equity, and emerging diagnostics.
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