Cataract surgery removes the cloudy natural lens of the eye and replaces it with a clear artificial one, called an intraocular lens or IOL. For most people, the surgery itself is not the hard decision. The harder question arrives a few weeks before, when the surgeon or counselor asks which kind of lens you want, and one option costs considerably more than the other.
The choice usually comes down to two broad families. A monofocal lens focuses at one distance. A multifocal lens splits light to provide focus at more than one distance, aiming to reduce how often you need glasses. This guide compares them on what the evidence says, who tends to be a good candidate for each, how payment usually works, and what changes if you have the surgery abroad.
When to have cataract surgery is a separate question, covered in our guide to cataract surgery now versus waiting. Here we assume you are going ahead and need to pick a lens.
How each lens works
Monofocal: one sharp focal point
A monofocal lens is set to give clear vision at a single distance. Most people choose distance, then use reading glasses for close work such as phones, menus and books. Some choose near focus instead and wear glasses for driving. Because all the incoming light is directed to one focal point, monofocal lenses are optically simple.
Multifocal: several focal points at once
A multifocal lens has zones or rings that send light to two or more focal points, typically distance and near, sometimes intermediate as well. Your brain learns to pay attention to the image that is in focus for what you are looking at. Because the available light is shared between focal points, some optical trade-offs come with the design.
Related designs you may hear about
- Extended depth of focus (EDOF) lenses stretch a single focal zone to cover distance and intermediate range. They are often presented as a middle option between monofocal and multifocal.
- Toric lenses correct astigmatism. Toric versions exist for both monofocal and multifocal designs, so astigmatism is a separate question from the monofocal-versus-multifocal decision.
- Monovision uses two monofocal lenses set differently: one eye for distance and one for near. It is a way to reduce glasses use without a multifocal lens, though not everyone adapts to it.
What the research comparison found
The most useful single source for this question is a Cochrane systematic review that pooled randomized trials comparing multifocal with monofocal lenses after cataract removal. The 2016 update included 20 trials with 2,230 participants (de Silva et al., Cochrane Review, 2016). Its findings, in plain terms:
- Distance vision without glasses was not meaningfully different between the two lens types, with moderate-certainty evidence.
- Near vision without glasses was probably better with multifocal lenses, though the size of the benefit varied widely between trials and the certainty was low.
- Needing glasses was less common with multifocal lenses, again with low-certainty evidence.
- Glare and halos were reported more often with multifocal lenses. Halos, rings seen around lights especially at night, were roughly three and a half times as likely in the pooled analysis, with moderate certainty.
The reviewers concluded that whether the near-vision benefit outweighs the visual side effects differs from person to person, and that how strongly someone wants to be free of glasses is likely to be the deciding factor. An earlier version of the review, with literature searches running to 2012, also reported reduced contrast sensitivity with multifocal lenses (Cochrane Library, 2012 version).
Head-to-head comparison
| Factor | Monofocal IOL | Multifocal IOL |
|---|---|---|
| Focus | One distance, usually far | Two or more distances |
| Glasses afterward | Usually needed for reading if set for distance | Needed less often, per pooled trials (Cochrane, 2016) |
| Distance vision without glasses | Similar to multifocal (Cochrane, 2016) | Similar to monofocal (Cochrane, 2016) |
| Halos and glare | Less common | More common (Cochrane, 2016) |
| Contrast sensitivity | Generally preserved | Reduced in earlier pooled trials (Cochrane, 2012 version) |
| Medicare coverage in the US | Conventional lens is the covered option (Medicare.gov) | Patient typically pays the extra premium-lens cost (AAO EyeNet) |
| Adaptation | Little adjustment needed | Some people need time to adapt; a minority remain bothered |
| Fit for eye conditions | Suitable for most eyes | Surgeons are often more selective when other eye disease is present |
Who tends to suit each lens
A monofocal lens may suit you if
- You drive a lot at night or do work where halos around lights would be a real problem.
- You already wear reading glasses comfortably and do not mind continuing.
- You have another eye condition affecting the retina or optic nerve, where your surgeon wants to preserve as much image quality and contrast as possible.
- You want the lowest out-of-pocket cost, or you are paying entirely yourself and prefer simplicity.
- You tend to be bothered by small visual imperfections.
A multifocal lens may suit you if
- Reducing dependence on glasses is genuinely important to you, and you understand it may not eliminate them.
- Your eyes are otherwise healthy, which is something your surgeon will assess with tests before recommending the lens.
- You can accept some degree of halos or glare at night, at least while adapting.
- You have realistic expectations about the extra cost and the chance you will still use glasses for some tasks.
Your surgeon's measurements of the eye, including the cornea's shape and any astigmatism, also influence which lenses are realistic. A candid surgeon will tell you if you are not a good multifocal candidate even if you would like one.
How the cost works
In the US
Medicare Part B may cover cataract surgery with a conventional intraocular lens. After the Part B deductible, you generally pay 20% of the Medicare-approved amount, and Medicare covers one pair of standard eyeglasses or one set of contacts after each surgery that implants a lens (Medicare.gov, 2026).
Presbyopia-correcting and astigmatism-correcting lenses are treated differently. The American Academy of Ophthalmology explains that, under federal rulings, Medicare pays the conventional-lens amount and the practice may bill the patient for the additional cost of the premium lens and associated services, and that patients must be allowed to choose a standard lens instead (AAO EyeNet, accessed 2026). Private insurers and Medicare Advantage plans set their own rules, so check your plan.
When paying yourself
If you are self-paying, at home or abroad, ask for a quote that separates the surgery, the facility, the lens itself and the pre-operative measurements. The lens model makes a large difference to price, and bundled quotes can hide which lens you are actually being offered. Ask for the brand and model name in writing.
Hidden extras to ask about
- Additional pre-operative testing for premium lenses.
- Laser enhancement if your eye ends up slightly off target.
- Follow-up visits beyond the first few.
- Treatment of posterior capsule clouding, which can develop months or years later.
Recovery and travel implications
The NHS describes cataract surgery as typically taking 20 to 45 minutes, with vision often blurry for a few hours from the dilating drops, several days for vision to improve, and eye drops usually needed for about four weeks. Both eyes are treated on separate days when both need surgery (NHS, reviewed 2025). The same page lists possible complications including retinal detachment, infection, bleeding, inflammation and the lens moving out of position, and notes that serious complications are rare.
For anyone considering surgery in Colombia or elsewhere abroad, lens choice adds a few specific considerations:
- Plan for both eyes. If both eyes need surgery on separate days, your stay needs to cover both procedures and the early checks after each. Ask the surgeon how many days they want between eyes.
- Multifocal adaptation happens after you leave. Halos and the brain's adjustment to multifocal optics can take time. Ask how the surgeon follows up remotely, and what options exist if you remain unhappy.
- Get the lens details. Leave with the manufacturer, model, power and any toric axis for each eye. An eye doctor at home needs this for follow-up care, and it matters if a lens ever needs replacing.
- Know the enhancement policy. If the final focus is slightly off, some clinics offer laser touch-ups. Ask whether that is included and whether it requires another trip.
- Arrange an eye doctor at home. Warning signs the NHS lists, such as sudden floaters, flashes or a dark curtain across your vision, need urgent attention wherever you are.
Questions to ask before choosing
- Am I a good candidate for a multifocal lens, given my measurements and eye health?
- Which specific lens model do you recommend, and why that one?
- How likely is it that I will still need glasses, and for what tasks?
- How often do your patients report halos or glare that bothers them long-term?
- Would monovision or an extended depth of focus lens be a reasonable alternative for me?
- What happens if I am unhappy with a multifocal lens?
- What exactly is included in the price, and what costs extra?
Summary
A monofocal lens offers simpler optics, fewer night-vision side effects and the standard insured option in the US, at the cost of needing glasses for some tasks. A multifocal lens can reduce dependence on glasses, but pooled trial evidence shows more halos and glare, and the extra cost is usually yours. Neither is better for everyone. If staying out of glasses matters a great deal to you and your eyes are healthy, a multifocal lens may be worth discussing. If night driving, image quality or budget come first, a monofocal lens is a sound choice. Your ophthalmologist's examination should guide the final decision.
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Frequently Asked Questions
Will I be completely free of glasses with a multifocal lens?
Not necessarily. Pooled trials found people with multifocal lenses needed glasses less often than those with monofocal lenses, but some still used them for certain tasks, such as fine print or dim light. Ask your surgeon how likely you are to need glasses for the activities you do most.
Do halos from multifocal lenses go away?
Many people report that halos become less noticeable as the brain adapts over time, but they do not disappear for everyone. The Cochrane review found halos were more common with multifocal lenses. If you drive often at night, discuss this risk in detail before choosing.
Can I have one type of lens in each eye?
Some surgeons do mix lens designs, or use monovision with two monofocal lenses set for different distances. These strategies suit some people better than others. Your surgeon may test how well you tolerate different focus in each eye before recommending this approach.
Can a multifocal lens be replaced if I do not like it?
Lens exchange is possible in some cases, but it is an additional operation with its own risks, and it is generally easier sooner rather than later. Ask your surgeon what options they offer if you remain unhappy, and whether alternatives like glasses or laser touch-ups would be tried first.
Does Medicare pay for a multifocal lens?
Medicare covers cataract surgery with a conventional lens. According to the American Academy of Ophthalmology, when a patient chooses a presbyopia-correcting lens, Medicare pays the conventional amount and the patient may be billed the additional premium cost. Private and Medicare Advantage plans set their own policies.
This article compares treatment options in general terms for educational purposes. It is not medical advice, and no comparison framework replaces an examination, imaging, and a conversation with a licensed physician who knows your case — candidacy, risks, and outcomes are individual. Any pricing reflects typical 2026 ranges, not quotes. ProcedureCompare.co is part of the ColombiaMedical.co network and may receive referral fees from providers; this never changes the prices you pay.