Monofocal, Multifocal, Toric and EDOF Intraocular Lenses: What Each Design Changes

The consent form is signed, the cataract is coming out, and then the surgeon asks a question that sounds almost casual: “Have you thought about which lens you’d like?” For many people that is the moment the operation stops being about removing something cloudy and becomes about choosing how they will see for the rest of their life.

The choice is real, and it is not trivial. The tiny acrylic disc placed inside the eye during cataract surgery cannot be swapped like a pair of glasses; it is meant to stay put for decades. Each design changes something specific: how far away things look sharp, whether reading glasses come back into the picture, how oncoming headlights behave at night.

This article walks through intraocular lens types explained in plain language, with the evidence where it exists and honest uncertainty where it does not. The decision itself stays where it belongs, with you and your treating team.

Intraocular lens types explained: what the artificial lens actually replaces

Behind the colored part of your eye sits a natural lens about the size of a lentil. Its job is to bend incoming light so that it lands precisely on the retina, the light-sensitive layer at the back of the eye. In youth that lens is clear and flexible; it changes shape to bring near and far objects into focus. A cataract is what happens when its proteins clump and the lens turns cloudy, scattering light instead of focusing it, according to the National Eye Institute.

Cataract surgery removes that cloudy lens and puts an intraocular lens, usually shortened to IOL, in its place. The IOL is a clear artificial lens, most often acrylic or silicone, folded to fit through an incision only a few millimeters wide and unfolded inside the thin capsule that once held the natural lens. The Mayo Clinic describes it as a permanent part of the eye that needs no care and cannot be felt.

Here is the catch. An artificial lens does not flex. It has a fixed power, measured in diopters, a unit describing how strongly a lens bends light. Once it is in, the eye can no longer shift focus from a road sign to a text message the way a twenty-year-old’s eye does. Every lens design on the market is a different engineering answer to that single limitation.

Some answers keep things simple and accept glasses for part of the day. Others try to build a range of focus into the lens itself, and they pay for it in other ways. Understanding that trade is the whole point of having intraocular lens types explained before the operation rather than after.

What actually happens during cataract surgery when the lens goes in

The operation is shorter than most people expect. The NHS puts the procedure itself at around 30 to 45 minutes, done as a day case, almost always under local anesthetic drops or an injection around the eye, with the patient awake but comfortable.

The surgeon makes a small incision at the edge of the cornea, the clear front window of the eye. Through it, a fine probe delivers ultrasound energy that breaks the cloudy lens into fragments, a step called phacoemulsification. The fragments are suctioned out, leaving the lens capsule, a transparent bag thinner than plastic wrap, largely intact. That bag becomes the pocket for the new lens.

The folded IOL is injected through the same incision and opens inside the capsule. Two flexible arms, called haptics, spring outward to hold it centered. If the lens is a toric design, meant to correct astigmatism, the surgeon rotates it to align with marks made on the eye beforehand, because its effect depends on orientation. The incision is usually so small that it seals on its own without stitches, as the Mayo Clinic notes.

Nothing about the choice of lens changes the basic steps. What changes is the measurement work done in the weeks before, and the alignment precision needed on the day. A multifocal or EDOF lens also demands that the capsule stay stable and the lens sit well centered, since even a small tilt can degrade the optical performance more than it would for a standard monofocal.

Both eyes are rarely done on the same day. The NHS explains that surgeons commonly wait for the first eye to settle before operating on the second, which also gives the patient a chance to judge whether the first lens choice suits their daily life before committing to the same or a different plan for the other eye.

Monofocal lenses: one clear distance, and why they remain the default

A monofocal lens has a single focal point. Light from one chosen distance lands crisply on the retina; everything nearer or farther is progressively blurred. Most people who receive one ask for clear distance vision and accept that reading, phone screens and price labels will need glasses, an arrangement the NHS describes as the usual outcome of standard cataract surgery.

That sounds like a limitation, and it is. But it comes with real strengths that explain why monofocal lenses are still the most widely implanted design worldwide. All of the light entering the eye goes to one focal point, so contrast tends to be strong, colors look vivid, and the risk of halos and glare from the lens itself is low. A Cochrane systematic review comparing monofocal and multifocal lenses found that monofocal recipients reported fewer visual disturbances such as halos, though they depended on glasses more.

Monofocal lenses also tolerate imperfection. A lens that sits slightly off center, or an eye with mild macular disease, or a pupil that opens very wide at night, will generally do better with a single focus than with a design that divides light.

Some surgeons offer a variation called monovision, in which one eye is set for distance and the other for intermediate or near tasks, using two monofocal lenses of different power. The brain learns to favor whichever eye is in focus. It suits some people well and irritates others, and it is usually trialed with contact lenses beforehand when possible.

The honest summary: a monofocal lens is the design least likely to surprise you. It trades convenience for predictability, and for many people, particularly those already used to reading glasses, that trade feels entirely fair.

Monofocal vs multifocal lens: what changes when you split the light

A multifocal intraocular lens contains concentric rings or zones of different power, so that light is divided into two or, in trifocal versions, three separate focal points: distance, intermediate and near. The brain receives sharp and blurred images at once and learns to attend to the sharp one. The result, for many people, is the ability to read a menu and see across the room without switching glasses.

The Cochrane review on this question, drawing on randomized trials, found that people with multifocal lenses were considerably less likely to need glasses for near work than those with monofocal lenses. That is the genuine benefit, and it is meaningful for someone who resents reaching for readers a dozen times a day.

The same review found the cost. Because light is split, each focal point receives only part of it, so contrast sensitivity, the ability to distinguish subtle shades of gray, is somewhat reduced. Halos around lights and glare at night were reported more often. A small number of people find these effects intolerable and have the lens exchanged, a second operation with its own risks.

The monofocal vs multifocal lens question, then, is not “which is better” but “which compromise do you prefer.” A night-shift driver who values crisp contrast in the dark may lean one way. A retired librarian who reads for hours and rarely drives after dusk may lean the other.

Multifocal lenses also work best in healthy eyes. Existing macular degeneration, significant glaucoma damage, corneal scarring or irregular astigmatism all reduce image quality before the lens even gets involved, and splitting an already compromised image tends to make things worse rather than better. Surgeons screen for these conditions carefully before offering the option.

Toric lens for astigmatism: correcting a cornea shaped like a football

Astigmatism means the cornea is curved more steeply in one direction than the other, more like the side of an American football than a basketball. Light entering along the steep axis focuses in a different place from light along the flat axis, so images smear in one direction. Glasses correct it with a cylinder-shaped lens; a toric intraocular lens builds that same correction into the implant.

Cataract surgery on its own does nothing for corneal astigmatism. Someone with a significant amount of it who receives a standard spherical lens will still need glasses for distance as well as near, even after a technically perfect operation. A toric lens for astigmatism addresses that gap. It has different powers along two axes and must be rotated at surgery to line up with the eye’s own steep axis.

That alignment is the whole game. If the lens rotates away from its intended position, either during surgery or in the days afterward as the capsule tightens, the correction weakens, and a large rotation can neutralize it entirely. This is why surgeons mark the eye while the patient is sitting upright beforehand, since the eye can roll slightly when lying down, and why some use image-guided systems to confirm the axis.

Toric correction is not a separate category from the others so much as a feature that can be added to them. Monofocal, multifocal and EDOF lenses all come in toric versions. A person with astigmatism who wants reduced dependence on glasses may be offered a toric multifocal; someone who prefers the simplicity of a single focus can have a toric monofocal.

Whether a toric design is worth it depends on how much corneal astigmatism the pre-operative measurements show and how regular its pattern is. Irregular astigmatism, such as from keratoconus or corneal scarring, is not well corrected by a toric IOL, and the surgeon may recommend other approaches.

EDOF lens pros and cons: stretching the focus rather than splitting it

Extended depth of focus, usually shortened to EDOF, describes lenses that create a single elongated focal zone instead of two or three discrete points. Various optical designs achieve this, some using diffractive patterns, others using subtle changes in curvature or small apertures. The intent is continuous clear vision from distance through intermediate range, roughly arm’s length, where laptop screens and car dashboards live.

The pro column starts with fewer halos. Because EDOF designs do not divide light as sharply as a multifocal, most people notice less pronounced rings around headlights, although some still see a soft glow or starburst effect. Contrast tends to fall somewhere between a monofocal and a multifocal.

The con column is near vision. EDOF lenses generally deliver less reading ability than a trifocal, and many recipients still use glasses for small print, prolonged reading or dim light. Some surgeons offset this by targeting one eye slightly nearer than the other, a mini-monovision approach that extends the combined range.

On the evidence, EDOF is the newest of the four categories and the one with the thinnest long-term literature. Randomized trials exist but are smaller and fewer than for multifocal designs, and the Cochrane review that anchors much of this article predates widespread EDOF use. What can be said with confidence is the optical principle and the general pattern of trade-offs; what cannot be said is that any particular EDOF lens performs better than another, or that outcomes for a given person are predictable.

EDOF lens pros and cons therefore come down to priorities. Someone whose day is mostly driving, screen work and conversation, and who does not mind readers for a novel at night, may find it a comfortable middle path. Someone who wants to read without glasses in bed will likely be disappointed.

Cataract lens options side by side: intraocular lens types explained in one table

Every lens design is a set of trade-offs rather than a ranking. The table below summarizes what each one changes, drawing on the mechanisms described by the Mayo Clinic, the NHS and the Cochrane review of multifocal versus monofocal lenses. “Typical” here means what most people experience, not a promise for any individual.

Design	How it handles focus	Typical glasses use afterward	Night halos and glare	Astigmatism correction	Usually offered to
Monofocal	One fixed focal point, usually distance	Glasses for near and often intermediate tasks	Lowest from the lens itself	Only in toric version	Almost anyone, including eyes with other disease
Multifocal (bifocal or trifocal)	Light split into two or three focal points	Reduced for most tasks; some still use glasses for fine print	Highest; a minority find it troublesome	Only in toric version	Healthy eyes, motivated to reduce glasses
EDOF	Single elongated focal zone, distance to intermediate	Often glasses for small print or dim light	Intermediate; softer glow rather than rings	Only in toric version	Screen and driving priorities, tolerant of readers
Toric (any of the above)	Adds cylinder power aligned to the cornea	Depends on the base design	Depends on the base design	Yes, for regular astigmatism	Meaningful regular corneal astigmatism

Two patterns stand out. First, the more independence from glasses a lens promises, the more it asks of the eye around it and the more optical side effects it introduces. Second, toric correction is a layer that can sit on top of any design, so having astigmatism does not lock anyone out of a particular category.

What the table cannot show is the person reading it. Cataract lens options only make sense against a specific life: the hours spent driving after dark, the fine embroidery or the fishing, the tolerance for a bit of haze around streetlights. That is the conversation to have with the surgeon.

Who is usually a candidate for each lens, and who is often asked to wait

Cataract surgery itself is usually offered once the cloudiness interferes with daily life: reading, driving, recognizing faces, or safely getting around, according to the NHS. Nobody is asked to wait until a cataract is “ripe,” a phrase from an earlier era of surgery. The lens choice within that operation is a separate set of judgments.

A monofocal lens is appropriate for virtually anyone having cataract surgery. It is the design surgeons reach for when the rest of the eye is not perfect, which describes a great many eyes.

Multifocal and EDOF lenses are typically offered to people with otherwise healthy eyes and a strong wish to reduce glasses use. Surgeons generally hesitate, or advise against them, when there is macular degeneration, diabetic retinopathy with macular involvement, advanced glaucoma, corneal disease or scarring, a history of corneal refractive surgery that makes measurements less reliable, weak lens zonules that could let the implant tilt, or a pupil that is very large or very small. Personality matters too: someone who describes themselves as particular about visual quality, or who drives long distances at night, is often steered toward a monofocal.

A toric lens is offered when pre-operative measurements show regular corneal astigmatism large enough that leaving it uncorrected would clearly require distance glasses. Irregular astigmatism usually rules it out.

Being asked to wait applies mainly to the operation rather than the lens. Active eye inflammation, an uncontrolled medical condition, or a recent change in the eye’s measurements can all prompt a delay. People taking certain medicines that affect the iris, such as alpha-blockers used for prostate symptoms, are not asked to stop them but are flagged so the surgeon can plan for a floppy iris, as the Mayo Clinic describes. Any change to medication remains the prescribing clinician’s call.

How is the lens power chosen, and what does the refractive target mean?

Before any cataract operation, the eye is measured with an instrument that uses light or ultrasound to record its length, the curvature of the cornea, and the depth of the front chamber, a process called biometry. Those numbers feed formulas that estimate which lens power will land focused light on the retina. The Mayo Clinic notes that this painless measurement happens about a week or more before surgery.

The surgeon then sets a refractive target, which is simply the intended prescription of the eye after healing. Most people choose a target near zero, meaning clear distance vision without glasses. Others deliberately choose mild short-sightedness so that reading or computer work is clear unaided while distance needs glasses, which suits lifelong myopes who have always read without spectacles.

Biometry is very good but not perfect. Formulas work best on eyes of average length; very long or very short eyes, and eyes that have had laser vision correction, carry more uncertainty, and the final prescription can land a fraction of a diopter from the target. For a monofocal recipient that usually means a slightly different glasses prescription than expected. For a multifocal recipient it can matter more, because those lenses perform best when the eye ends up very close to the intended target.

A few designs allow the power to be adjusted after implantation using targeted light treatment in the clinic, and others allow a supplementary lens to be added later. These remain less common, and evidence on their long-term behavior is still accumulating.

None of this is a decision the patient makes alone. The surgeon proposes a target based on the measurements and the conversation about daily habits, then explains where the uncertainty lies. A good question to ask is how they plan to handle a result that misses the target.

What the first days and weeks after surgery usually look like

Most people go home within an hour or two, wearing a clear shield over the eye, with vision that is blurry, watery and sensitive to light. The Mayo Clinic describes vision typically beginning to clear within a few days, though colors may look startlingly brighter because the yellow-tinted cataract is gone.

Anti-inflammatory and antibiotic eye drops are prescribed for several weeks; their schedule is set by the surgical team and should be followed exactly, without stopping early even when the eye feels fine. The NHS advises avoiding rubbing the eye, swimming, strenuous exercise and eye makeup for a period the team will specify, and using the shield at night while the incision seals.

Follow-up visits are typically arranged in the first days, again around a week, and again after about a month, according to the Mayo Clinic, with complete healing usually taking up to about eight weeks. The NHS describes full recovery in roughly 4–6 weeks for most people, with a glasses check once the prescription has stabilized. Driving can resume once the eye meets the legal vision standard, which the care team will confirm.

The lens type shapes this period in a specific way. Monofocal recipients often notice clear distance vision quickly and reach for readers within days. Multifocal and EDOF recipients frequently describe a phase in which near vision is not yet crisp and lights have halos, which usually improves over weeks to months as the brain adapts. The second eye, when done, tends to help, because the brain fuses two images.

Some mild grittiness, dryness and fluctuating focus are ordinary during healing. Increasing pain, worsening vision or a red, discharging eye are not, and are covered in the section on when to call your doctor.

Halos, glare and neuroadaptation: why vision keeps changing after the operation

Neuroadaptation is the brain’s process of learning to interpret a new optical input. It is not a marketing word; it describes the same plasticity that lets people adjust to a new pair of progressive glasses or to reading with one eye after an injury. With intraocular lenses it matters most for multifocal and EDOF designs.

A multifocal lens sends the retina a sharp image and one or two blurred, overlapping ones at the same time. In the first weeks the brain has not yet learned to suppress the out-of-focus layers, and people often describe a faint ghosting on text or a ring of light around headlights. Over weeks to months many find these effects fade into the background, not because the optics change but because attention does. The Cochrane review nonetheless found that a proportion of multifocal recipients continued to report halos and glare well after surgery, so adaptation is common but not universal.

Pupil size plays a large role. In bright daylight a small pupil uses only the central part of the lens, where most designs behave close to a monofocal. At night the pupil widens, exposing the outer rings, and that is when halos peak. People who drive frequently after dark are the group most likely to notice, which is why surgeons ask about it.

Monofocal recipients are not immune to visual oddities. Some report a crescent of shadow or a flicker of light at the edge of vision, called dysphotopsia, related to the edge of the lens or the incision. These effects usually settle over months and are seldom severe, though persistent cases exist.

The practical lesson is patience with a defined limit. Judging a multifocal or EDOF lens in the first fortnight is premature; judging it at several months, after the second eye and a settled glasses check, is fair. If the effects remain intolerable at that point, the surgeon can discuss options, including exchange, with their attendant risks.

What people often get wrong about intraocular lenses

Cataracts grow back. They do not. The natural lens is gone, and an acrylic lens cannot cloud. What can happen is posterior capsule opacification, in which the capsule holding the implant thickens and mists over months or years, blurring vision in a way that feels like the cataract returning. The Mayo Clinic describes a brief outpatient laser procedure, called a YAG capsulotomy, that opens a window in the capsule and restores clarity.

A multifocal lens means no glasses ever. The evidence says otherwise. The Cochrane review found reduced glasses dependence, not elimination, and many recipients keep a pair of readers for fine print or dim restaurants. Anyone told they will never need glasses again should hear that as enthusiasm rather than a guarantee.

Toric lenses are a different kind of lens. They are a feature, not a category. Any of the three focus designs can incorporate astigmatism correction, so a person with astigmatism has the same range of choices as anyone else, provided their astigmatism is regular.

Newer means better. EDOF lenses are the most recent category and have the least long-term data. That is not a criticism of the design; it is a statement about what is known. A monofocal lens has decades of follow-up behind it.

The lens can be swapped if it disappoints. Exchange is possible but is a second intraocular operation, harder than the first because the capsule has healed around the implant, with a higher risk of complications. Surgeons treat it as a last resort, which is why the pre-operative conversation deserves so much attention.

Surgery is risky enough to postpone as long as possible. The NHS estimates serious complications at roughly 1 in 50 cases, most of them treatable, with permanent visual loss much rarer. Delaying surgery while a cataract impairs driving or increases fall risk carries its own hazards.

Questions to ask your care team before choosing a lens

The consultation goes better when the patient arrives with a picture of their own day. Before listing questions, it helps to write down what you actually do with your eyes: how many hours of screen work, how often you drive at night, whether you read in bed, whether you fish, sew, play golf or scan spreadsheets. Surgeons make better recommendations from specifics than from “I’d like to see well.”

Questions about your eye:

• Do my measurements show astigmatism, and is it regular enough for a toric lens to correct?
• Is there anything about my retina, cornea, optic nerve or pupil that would make a multifocal or EDOF lens a poorer choice for me?
• Have I had laser vision correction or other eye surgery that affects how reliably my lens power can be calculated?

Questions about the plan:

• Which refractive target are you proposing, and why that one for me?
• If I choose a monofocal lens, will I be set for distance, near or a monovision arrangement, and can I trial that with contact lenses first?
• How will you handle it if the final prescription misses the target?
• Will the second eye be planned with the same lens, and how long will you wait between eyes?

Questions about living with the result:

• What visual side effects should I expect with this design, and how long do they typically take to settle?
• At what point, if I am unhappy, would we consider a lens exchange, and what are its risks?
• What symptoms after surgery should make me call the same day?

Ask, too, whether the surgeon implants the design they are recommending regularly. Familiarity with a lens matters for alignment and for troubleshooting afterward. Then take the answers home. The NHS notes that cataract surgery is rarely urgent, and a decision about a lens meant to last decades can survive a week of reflection.

When to call your doctor after intraocular lens surgery

Ordinary healing is uncomfortable but not alarming: a gritty feeling, mild ache, watering, light sensitivity and blurred or fluctuating vision that improves day by day, as both the NHS and the Mayo Clinic describe. The signs below are different. They can indicate infection, a rise in eye pressure, retinal detachment or a displaced lens, and all of them warrant contacting the surgical team or emergency services the same day rather than waiting for the next scheduled visit.

Call urgently if you notice any of the following:

• Pain that is increasing rather than settling, or pain that eye drops and simple relief from the discharge instructions do not touch
• Vision that is getting worse after it had begun to improve, or a sudden drop in vision
• Increasing redness, especially with a sticky or pus-like discharge, or swelling of the eyelids
• A sudden shower of new floaters, flashes of light, or a dark curtain or shadow moving across part of your vision, which can signal retinal detachment
• Nausea or vomiting with eye pain and a hazy view, which can accompany a sharp rise in eye pressure
• A visible change in the position of the pupil or a sense that the image has shifted, tilted or doubled in the operated eye, which can occur if the lens has moved

Infection inside the eye after cataract surgery, called endophthalmitis, is rare but can progress within hours, which is why any combination of worsening pain, redness and falling vision is treated as an emergency. The NHS lists it among the serious complications that fall within its roughly 1 in 50 estimate.

Months or years later, a slow return of misty vision is more often posterior capsule opacification than anything sinister, but it still deserves an eye examination rather than assumption. New distortion of straight lines, or a change in one eye that the other does not share, should likewise prompt a visit. The treating team decides what is happening and what, if anything, needs doing.

Frequently asked questions

Which intraocular lens do most people get after cataract surgery?

A monofocal lens set for distance vision is the most common choice worldwide. It offers a single sharp focal point, strong contrast and the lowest rate of halos from the lens itself, with glasses used for reading and close work. Surgeons also favor it when the eye has other conditions such as macular degeneration or glaucoma, because it tolerates imperfections in the rest of the visual system better than designs that split light.

Monofocal vs multifocal lens: which gives better vision?

Neither is better in every situation; they optimize different things. A monofocal lens gives the crispest single-distance vision with minimal halos but usually requires reading glasses. A multifocal lens provides usable vision at two or three distances, reducing glasses use, at the cost of some contrast and more halos at night, according to a Cochrane review of randomized trials. The right answer depends on your eye health, habits and tolerance for visual side effects.

Do I need a toric lens for astigmatism if I have only a small amount?

Not necessarily. Small amounts of regular corneal astigmatism often cause little blur and can be left uncorrected or handled with glasses afterward. Surgeons consider a toric lens when pre-operative measurements show enough regular astigmatism that a standard lens would clearly leave distance vision blurred. Irregular astigmatism from conditions like keratoconus is not well corrected by a toric implant. Your surgeon will interpret the measurements and explain the threshold they use.

What are the EDOF lens pros and cons compared with a trifocal?

An EDOF lens creates one elongated focal zone from distance to arm’s length, producing softer halos and better contrast than most trifocals, which suits driving and screen work. Its main drawback is weaker near vision, so many recipients still use glasses for small print or reading in dim light. A trifocal gives stronger reading vision but more pronounced rings around lights at night. Long-term evidence for EDOF designs is still accumulating.

What cataract lens options are there for someone who has had laser eye surgery?

All lens categories remain possible, but previous corneal laser surgery changes the shape of the cornea in ways that make standard lens-power formulas less reliable. Surgeons use specialized calculation methods and may counsel more caution about multifocal designs, which depend on landing very close to the intended prescription. Some people in this situation are offered lenses whose power can be adjusted or supplemented after healing. Discuss your surgical history in detail at the consultation.

Can a multifocal intraocular lens be removed if I cannot tolerate the halos?

Yes, lens exchange is possible, but it is a second operation inside the eye and is technically harder than the first because the capsule has healed around the implant, so it carries higher risk. Surgeons usually wait several months for neuroadaptation, and often for the second eye to be done, before considering it. Many people find halos fade with time. Exchange is treated as a last resort rather than a routine adjustment.

How long does it take to adjust to a new intraocular lens?

Basic healing takes a few weeks, with the Mayo Clinic describing complete healing within about eight weeks and the NHS describing full recovery in roughly 4–6 weeks for most people. Adapting to a multifocal or EDOF lens, in the sense of the brain learning to ignore halos and out-of-focus images, often continues for several months. Monofocal recipients usually notice stable vision sooner because there is only one image to interpret.

Will I still need glasses after cataract surgery with a premium lens?

Quite possibly, at least for some tasks. Evidence from randomized trials shows multifocal lenses reduce dependence on glasses substantially but do not eliminate it for everyone; fine print, dim lighting and prolonged reading are common reasons people keep a pair of readers. EDOF recipients use glasses for near work more often than trifocal recipients. Anyone promised they will never wear glasses again should treat that as optimism rather than a guarantee.

Why is my vision cloudy again a year or two after cataract surgery?

The most common cause is posterior capsule opacification, where the thin capsule holding the lens thickens and scatters light, mimicking the original cataract. The artificial lens itself cannot cloud. The Mayo Clinic describes a brief outpatient laser procedure, YAG capsulotomy, that opens a clear window in the capsule. Other causes are possible, including changes in the retina, so new misting should always be checked by an eye specialist rather than assumed.

Can I have different types of lens in each eye?

Yes, and it is done deliberately in some plans. A common approach with monofocal lenses is monovision, setting one eye for distance and the other for near. Some surgeons pair an EDOF lens in one eye with a trifocal in the other, or set two EDOF lenses at slightly different targets, to widen the combined range. Whether this suits you depends on how well your brain fuses the two images, which is why the first eye’s result guides the plan for the second.

References

• NHS: Cataract surgery
• National Eye Institute (NIH): Cataracts
• MedlinePlus: Cataract removal

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.