Cataract Surgery

Introduction

If you have been told you have a cataract and surgery has been suggested, you are not alone. Cataract surgery is one of the most frequently performed operations in the world, and for most people it restores clearer vision and a better quality of daily life. Still, knowing that a procedure is common does not always make it feel less significant when it is your own eye. You may have questions about what the operation involves, which type of lens to choose, how recovery will feel, and what life will look like afterwards.

This guide walks you through cataract surgery from start to finish. It explains what cataracts are and why they affect vision, the different surgical techniques available, the lens choices you and your ophthalmologist will discuss, what happens on the day of surgery, and how recovery typically unfolds. It also covers risks, what to watch for in the weeks that follow, and what to expect in the months and years after the operation.

The aim is to give you a clear picture of the journey so that your conversations with your eye doctor can be focused, informed, and grounded in realistic expectations.

What Is Cataract Surgery?

A cataract is a clouding of the natural lens inside the eye. The lens sits behind the coloured part of the eye (the iris) and the pupil. In a healthy eye, the lens is transparent and helps focus light onto the retina at the back of the eye. As a cataract develops, proteins inside the lens clump together and the lens becomes hazy, yellowed, or opaque. Light no longer passes through cleanly, and vision becomes blurred, faded, or glary — particularly in low light or against bright headlights at night.

Cataract surgery is the operation that removes this clouded lens and replaces it with a clear artificial lens called an intraocular lens, often shortened to IOL. The IOL is permanent. It sits in roughly the same position as the natural lens and takes over its focusing role. Once the cataract is removed and the IOL is in place, light can again pass cleanly through to the retina.

Modern cataract surgery is typically performed as a day procedure. Most patients are awake but comfortable, with the eye numbed by drops or a local injection. The operation itself usually takes between 15 and 30 minutes for an uncomplicated case, although you will be at the hospital or surgical centre for several hours overall for preparation, the procedure, and a short recovery period before going home.

Cataract surgery is generally one eye at a time. If you have cataracts in both eyes, the second eye is usually operated on a few weeks after the first, although in selected cases some surgeons offer same-day surgery for both eyes.

Why Is Cataract Surgery Performed?

The main reason for cataract surgery is to restore vision that has been lost or degraded by a cataract. The decision to proceed is not based on the cataract reaching a particular size or "ripeness" — older teaching suggested waiting for a cataract to become "mature," but current ophthalmology practice does not require this. Today, the question is whether the cataract is affecting your vision enough to interfere with the activities you want to do.

Common reasons people decide to proceed with surgery include:

• Difficulty reading, watching television, or seeing faces clearly
• Trouble driving, particularly at night or in glare from oncoming headlights
• Difficulty with hobbies, work tasks, or seeing in dim light
• Frequent changes in glasses prescription that no longer fully correct the vision
• Faded or yellow-tinted colours
• Increased risk of falls because of unreliable vision

There are also medical reasons your ophthalmologist may suggest surgery even before the visual symptoms feel severe. These include a cataract that is making it difficult to examine or treat another eye condition such as diabetic retinopathy or age-related macular degeneration, or rare situations where the cataract itself is causing inflammation or raised pressure inside the eye.

Who Is a Candidate?

Most adults with a visually significant cataract are candidates for surgery. There is no strict upper age limit. Healthy patients in their 80s and 90s undergo cataract surgery routinely and do well. What matters more than age is whether the eye is healthy enough to benefit from the operation and whether the rest of your health allows you to undergo a short surgical procedure.

Before surgery, your ophthalmologist will examine both eyes carefully and take a series of measurements to plan the operation. This pre-operative assessment usually includes:

• A check of your current vision and prescription
• A slit-lamp examination to look at the cataract and the rest of the front of the eye
• An examination of the back of the eye (the retina and optic nerve)
• Measurement of the pressure inside the eye
• Biometry — precise measurements of the length and curvature of the eye, used to calculate the power of the IOL

Certain conditions may make surgery more complex but do not necessarily rule it out. These include previous eye surgery, very advanced cataracts, narrow pupils, weak lens-supporting structures (a condition called pseudoexfoliation), glaucoma, diabetic eye disease, macular degeneration, or a history of eye trauma. Your surgeon will discuss any added complexity and what it means for your particular case.

If you have another eye condition such as macular degeneration, cataract surgery will only improve the vision that the underlying condition allows. The cataract surgery will not fix the other condition, but removing the cataract often still gives a worthwhile improvement and allows the other condition to be monitored more easily.

Alternatives

Cataract surgery is the only definitive treatment for a cataract. There are no eye drops, tablets, or laser treatments that can clear a cataract once it has formed. Studies of various medical therapies have so far not shown a reliable way to reverse lens clouding.

That said, surgery is not always immediately necessary. If your cataract is early and only mildly affecting your vision, your ophthalmologist may discuss non-surgical adjustments while you watch and wait, such as:

• An updated glasses prescription
• Stronger reading light at home
• Anti-glare coatings on glasses
• Magnifiers for reading
• Avoiding driving at night if glare has become a problem

These measures do not treat the cataract, but they can help you manage day-to-day vision until surgery becomes the better option. The timing of surgery is ultimately a shared decision between you and your ophthalmologist, based on how much the cataract is affecting your life and the condition of the rest of the eye.

Surgical Approaches

There are a few different techniques used to remove a cataract. The choice depends on the density of the cataract, the condition of the eye, the equipment available, and the surgeon's training and judgment. The most widely used approach today is phacoemulsification.

Phacoemulsification

Phacoemulsification, sometimes shortened to "phaco," is the standard technique for cataract surgery worldwide. The surgeon makes a very small incision — typically around 2 to 3 millimetres — at the edge of the cornea (the clear front window of the eye). A fine probe is inserted through this incision. The probe vibrates at ultrasound frequency, gently breaking up the cataract into tiny fragments that are then suctioned out of the eye. The natural lens capsule — a thin clear bag that held the lens — is preserved, and the new IOL is folded and inserted through the same small incision before being unfolded inside the capsule.

Because the incision is so small, stitches are often not needed; the wound seals itself. This typically allows quicker recovery and earlier return of vision than older techniques.

Femtosecond Laser-Assisted Cataract Surgery

In femtosecond laser-assisted cataract surgery (sometimes called FLACS), a laser is used to perform some of the steps that the surgeon would otherwise do with a blade. The laser can create the corneal incisions, open the front of the lens capsule in a precise circular pattern, and pre-fragment the cataract so that less ultrasound energy is needed during the phacoemulsification step.

The aim is greater precision in some of the steps. Major studies comparing laser-assisted and manual phacoemulsification have generally shown that both techniques deliver excellent visual outcomes. Whether laser assistance offers a meaningful advantage depends on the individual eye and surgeon. Your ophthalmologist may discuss this option, particularly if you are considering a premium IOL or have a particularly dense cataract.

Extracapsular Cataract Extraction

Extracapsular cataract extraction (ECCE), and a related technique called manual small-incision cataract surgery (MSICS), removes the cataract in one piece rather than breaking it up inside the eye. This requires a larger incision and may need stitches. It is used in situations where phacoemulsification is not the safer choice — for example, when the cataract is very dense and hard, when there are concerns about the supporting structures of the lens, or when the appropriate equipment is not available. Visual outcomes can still be very good, although recovery may take slightly longer because the incision is larger.

Intraocular Lens (IOL) Choices

• Monofocal IOLs. These provide clear vision at a single distance, typically far. Most people who choose monofocal lenses still need glasses for reading. They are the most widely used IOL type and produce reliably sharp vision at the chosen focal point.
• Multifocal IOLs. These have multiple focal zones built into the lens to provide vision at distance, intermediate, and near. They can reduce dependence on glasses, but some people notice glare, haloes around lights, or reduced contrast, particularly at night.
• Extended depth of focus (EDOF) IOLs. These provide a continuous range of vision from far to intermediate distances, with less near vision than multifocals but typically fewer night-vision side effects.
• Toric IOLs. These correct astigmatism (an irregular curvature of the cornea) in addition to providing clear vision at one or more focal points. They can be either monofocal toric or multifocal toric.
• Monovision strategy. This is not a lens type but an approach where one eye is targeted for distance vision and the other for near. It can reduce dependence on glasses, but the brain needs time to adapt and not everyone tolerates it well.

There is no single “best” lens. Each option has trade-offs in terms of glare, contrast, range of vision, and dependence on glasses. The choice is best made together with your ophthalmologist after a discussion of your visual priorities — for example, whether you would rather have crisp distance vision and use reading glasses, or accept some compromise in night vision in exchange for less dependence on glasses overall.

Preparing for Cataract Surgery

Once you and your ophthalmologist have decided to proceed, a number of steps happen before the day of surgery. These are designed to make the operation safer and to give the surgeon the information needed to choose the correct IOL power.

Typical pre-operative steps include:

• Biometry. Precise measurements of the length of the eye and the curvature of the cornea are used to calculate the IOL power that will give the best chance of your target post-surgical vision.
• General health review. Your overall health is assessed. Conditions like diabetes, high blood pressure, or heart disease do not prevent surgery, but they need to be well-controlled.
• Medication review. Most people continue their usual medicines through surgery. Some blood-thinning medicines may be adjusted, but only on the advice of your prescribing doctor. Certain medicines used for an enlarged prostate (tamsulosin and similar) can affect how the pupil behaves during surgery; mention any such medicines to your surgeon, even if you stopped them some time ago.
• Eye drops. You may be asked to start using antibiotic and/or anti-inflammatory eye drops in the day or two before surgery.
• Fasting instructions. Depending on the anaesthesia plan, you may be asked not to eat or drink for a few hours before the procedure.

You should also arrange for someone to bring you home after the surgery, since you will not be able to drive immediately afterwards. It is helpful to prepare your home for the first few days — clear pathways, easy-to-reach essentials, and any prescribed eye drops ready to use.

What Happens During Cataract Surgery

On the day of surgery, you will arrive at the hospital or surgical centre and check in. Drops will be put in your eye to dilate the pupil and begin numbing the surface. You will usually be given a mild sedative to help you relax. Most patients remain awake but calm and comfortable; general anaesthesia is reserved for special situations, such as patients who cannot stay still or children.

In the operating area, your face is gently cleaned, a sterile drape is placed around the eye, and a small device holds the eyelids open so you do not have to worry about blinking. You will be asked to look at a bright light during the operation. You will see lights and shapes moving but you should not see any sharp instruments.

The surgeon then carries out the chosen technique. In phacoemulsification, this means making the small corneal incision, opening the front of the lens capsule, breaking up and removing the cataract, polishing the inside of the capsule, and inserting the folded IOL through the same small opening. The IOL unfolds inside the capsule and is positioned in place. The wound is then checked to make sure it is sealed.

The procedure usually takes 15 to 30 minutes. Patients often describe feeling pressure on the eye but no sharp pain. If you feel any discomfort, you can tell the surgical team and they can adjust the anaesthesia.

After the surgery, a clear shield or patch may be placed over the eye. You will rest in a recovery area for a short period, receive instructions for the days ahead, and then go home.

Recovery and Healing

The First 24 Hours

You will be advised to rest at home for the rest of the day after surgery. The eye may feel gritty, watery, or mildly sore. Vision through the operated eye may be blurry, hazy, or unusually bright. You may see ghosting around lights. This is normal.

The eye shield is typically kept on for the first night to protect against accidental rubbing during sleep.

The First Week

You will usually be reviewed by your ophthalmologist within a day or two of surgery. Eye drops — usually a combination of antibiotic and anti-inflammatory drops — are continued for several weeks according to a tapering schedule. Following the drop schedule carefully matters; missed drops can increase the risk of inflammation or infection.

During this period it is sensible to:

• Avoid rubbing the eye
• Wear the eye shield at night for the first week
• Avoid getting water, soap, or shampoo directly into the eye
• Avoid swimming and hot tubs
• Avoid heavy lifting, straining, and bending forward for long periods
• Avoid dusty or smoky environments
• Wear sunglasses outdoors for comfort and protection from bright light

Light activities, reading, watching television, and walking are generally fine from the day after surgery. Many people return to desk-based work within a few days, although vision may not yet be at its final clarity.

Weeks Two to Six

Most people see noticeable improvement in vision during this period. Eye drops are slowly reduced according to the schedule. The eye continues to settle, and any residual blurriness or fluctuation usually improves.

Driving can usually be resumed once your vision meets the legal standard and your ophthalmologist confirms it is safe. The timing varies, but for many people this is within one to two weeks.

If you need a new glasses prescription, this is usually checked around four to six weeks after surgery, once the eye has fully stabilised. If you are having surgery on the second eye, it is often scheduled in this window.

Beyond Six Weeks

By around six weeks, the eye is generally healed and the vision has stabilised. A final post-operative review confirms the result, checks the position of the IOL, and updates the glasses prescription if needed. Normal activities, including swimming and exercise, are usually fully resumed at this point.

Risks and Complications

Cataract surgery is generally a safe operation with a high success rate, but no surgery is without risk. Most complications are uncommon and treatable, particularly when identified early. It is helpful to know what is possible, both so you can give informed consent and so you know what to watch for.

Common, usually minor effects in the days after surgery include:

• Mild eye irritation, grittiness, or watering
• Temporary blurry vision
• Light sensitivity
• Small bruise on the white of the eye from the anaesthetic injection (if used)

Less common but more important complications include:

• Infection inside the eye (endophthalmitis). Rare but serious. It typically presents with increasing pain, redness, and loss of vision in the days after surgery. Urgent treatment is needed.
• Inflammation inside the eye. Some inflammation is expected after surgery and is treated with drops. Excessive inflammation may need additional treatment.
• Raised eye pressure. Usually short-lived and managed with drops.
• Swelling of the cornea. May cause blurred vision in the early days. Usually settles, though some patients with pre-existing corneal disease may take longer.
• Swelling of the macula (cystoid macular oedema). Can cause blurred central vision a few weeks after surgery. Usually treatable with drops.
• Posterior capsule rupture. A tear in the thin bag that holds the lens. The surgeon manages this during the operation; it may change which IOL is used or how it is positioned.
• Retinal detachment. A rare but serious complication where the retina separates from the back of the eye. It can occur weeks or months after surgery and is more common in highly short-sighted eyes. New floaters, flashes of light, or a curtain across your vision should be reported urgently.
• IOL position issues. The new lens occasionally needs repositioning.
• Refractive surprise. Despite careful measurements, the final glasses prescription may not be exactly as predicted. Small adjustments are normal; a larger surprise may need glasses, contact lenses, or in some cases a further procedure.

One very common late effect of cataract surgery is posterior capsule opacification, sometimes called “secondary cataract,” although it is not a true cataract. The thin capsule that holds the IOL can become cloudy months or years after surgery, causing the vision to gradually blur again. This is treated with a brief, painless laser procedure called YAG capsulotomy, performed in the clinic. It usually restores clear vision within a day.

Life After Cataract Surgery

For most people, cataract surgery delivers a substantial improvement in vision. Colours often look brighter and more vivid afterwards, because the yellowing effect of the cataract is removed. Many patients comment on how much sharper everyday details look — print, faces, signs, the texture of leaves on trees.

Glasses needs after surgery depend on the IOL chosen and the result achieved. If you had a monofocal lens set for distance, you will most likely still need reading glasses. If you had a multifocal or extended depth of focus lens, you may be able to do most tasks without glasses, though some people still use them for fine print or prolonged reading. If you had astigmatism corrected with a toric lens, the dependence on glasses for that astigmatism is often reduced.

Once the eye has fully healed, the IOL is permanent and does not wear out. It does not need replacement, and it is not affected by the natural ageing of the rest of the eye in the same way as the original lens.

Other parts of the eye continue to age, however. Conditions like glaucoma, macular degeneration, and diabetic eye disease can still develop or progress. Regular eye examinations — usually every one to two years, or as advised by your ophthalmologist — remain important after cataract surgery.

If you had surgery only on one eye, the second eye may also develop a cataract over time and may need surgery in the future. Some people have surgery on the second eye soon after the first; others wait until the cataract becomes visually significant.

Cataract Surgery in Children

Although cataract is most often associated with ageing, children can also have cataracts — either present at birth (congenital cataract) or developing later in childhood. Paediatric cataract surgery is a specialised area and differs from adult cataract surgery in several important ways.

Children's eyes are still growing, which affects the choice and timing of IOL implantation. The visual system is also still developing; an untreated cataract in a young child can lead to amblyopia (sometimes called “lazy eye”) because the brain does not receive a clear image during a critical period of development. For this reason, timing of surgery is important and is usually decided by a paediatric ophthalmologist.

Surgery in children is performed under general anaesthesia. The technique is broadly similar to adult phacoemulsification, but additional steps may be needed, such as removing part of the back of the capsule to prevent rapid clouding, which is more common in children. In very young infants, the surgeon may delay placing an IOL and instead correct vision with contact lenses or glasses, with an IOL implanted later when the eye has grown.

Post-operative care in children is more involved than in adults. It includes:

• Frequent follow-up appointments
• Treatment for amblyopia, often with patching of the stronger eye
• Long-term refractive correction with glasses or contact lenses, since the implanted IOL will not adapt as the eye grows
• Ongoing monitoring for glaucoma, which is more common after paediatric cataract surgery

Outcomes depend heavily on early detection, prompt surgery, and consistent follow-up. Parents should expect a long-term relationship with the paediatric eye team, often extending through childhood and into the teenage years.

Frequently Asked Questions

Will I be awake during the surgery?

Most adults are awake but relaxed, with the eye numbed by drops or an injection and a mild sedative to help with anxiety. You will not see the instruments or the details of the surgery; you will see lights and shapes. General anaesthesia is reserved for situations where staying still is not possible or for children.

Will the surgery hurt?

You should not feel sharp pain. Most people describe a sensation of pressure, water on the eye, and bright light. If you feel discomfort during the procedure, the team can adjust the anaesthesia.

How soon will I see clearly?

Many people notice improvement within a day or two, but vision typically continues to sharpen over the following weeks. Final stable vision is usually reached by four to six weeks, when a new glasses prescription can be issued if needed.

Can both eyes be done at the same time?

Cataract surgery has traditionally been done one eye at a time, with a gap of a few weeks before the second eye. Same-day surgery on both eyes is offered in some centres for selected patients. Your ophthalmologist will discuss what is appropriate for your situation.

Will I still need glasses after cataract surgery?

This depends on the IOL chosen. With a standard monofocal lens, most people still need glasses for reading. Multifocal and extended depth of focus lenses can reduce the need for glasses but have their own trade-offs. The honest answer is that no IOL fully reproduces the focusing ability of a young natural lens, so some glasses use is common.

Can the cataract come back after surgery?

The cataract itself does not come back, because the cloudy lens has been removed. However, the thin capsule that holds the IOL can become cloudy months or years later — this is called posterior capsule opacification, sometimes referred to as “secondary cataract.” It is treated with a brief laser procedure called YAG capsulotomy and usually restores clear vision quickly.

When can I drive again?

Not on the day of surgery. After that, driving can usually resume once vision meets the legal standard and your ophthalmologist confirms it is safe, which is often within one to two weeks. If you have had only one eye operated on and the other still has a significant cataract, the timing may be different.

Can I fly after cataract surgery?

Air travel itself does not affect a healing eye, but most surgeons prefer that you be available locally for the early post-operative checks. If you need to travel, discuss the timing with your surgeon so follow-up can be planned safely.

What should I watch for after surgery?

Contact your eye doctor promptly if you experience increasing pain, increasing redness, a sudden drop in vision, new floaters, flashes of light, or a shadow or curtain across your vision. These can be signs of complications such as infection or retinal problems that need urgent attention.

Is there an age limit for cataract surgery?

There is no strict upper age limit. Patients in their 80s and 90s undergo cataract surgery routinely. What matters more is the overall health of the eye, the impact of the cataract on daily life, and whether you are well enough to tolerate a short surgical procedure.

Conclusion

Cataract surgery has been refined over decades into a precise, generally short, day-care operation that restores vision for the great majority of people who undergo it. The decision to proceed is not based on a cataract reaching a particular ripeness, but on whether it is affecting the way you live, work, drive, and enjoy daily life. The choice of surgical technique and intraocular lens involves trade-offs that are best worked through in a careful conversation with your ophthalmologist, based on your eye health, your visual needs, and what you most want from your vision afterwards.

Recovery is usually quick, but the eye still benefits from gentle handling, faithful use of the prescribed drops, and the recommended follow-up visits. Most people return to their usual activities within a few weeks, often with the welcome surprise of brighter colours and sharper detail. Knowing what to expect at each stage — the preparation, the day itself, the early healing, and the months that follow — helps make the experience feel less unfamiliar and lets you focus on the good outcomes the operation can bring.