Comparison guide

Monofocal vs Multifocal IOL: Which Is Better? (2026)

A monofocal IOL gives sharp vision at one distance, usually far, so most people still need reading glasses. A multifocal IOL splits light for far, middle and near, cutting glasses use but adding halos and glare. In Seoul, multifocal lenses cost about ₩4.5M–₩6.5M per eye; monofocal costs much less.
Reviewed November 2026 · Seoul LASIK Clinic Directory
Monofocal vs Multifocal IOL: Which Is Better? (2026)

Is a monofocal or multifocal IOL better?

A monofocal lens is better if you want the sharpest, cleanest vision at one distance and do not mind reading glasses. A multifocal lens is better if being largely glasses-free matters most and you can accept some halos around lights at night.

An intraocular lens (IOL) replaces your natural lens during cataract surgery or refractive lens exchange. Once it is in, it is meant to stay for life, so the choice deserves time. Your eye health matters as much as preference: macular disease, glaucoma, significant dry eye or an irregular cornea can make a multifocal lens a poor fit. Discuss this with your ophthalmologist after a full exam.

How do the two lenses work?

A monofocal IOL focuses light at a single distance; a multifocal IOL uses rings or diffractive zones to split light between several distances.

Most monofocal lenses are set for distance, which gives crisp vision for driving and TV, but you will need reading glasses for phones and books. Toric monofocals also correct astigmatism. A multifocal IOL, including trifocals such as Alcon PanOptix, divides incoming light between far, intermediate and near focus. Your brain learns to use the image that is in focus, a process called neuroadaptation that can take weeks to months. Because light is split, each distance gets a share of it, which can lower contrast slightly and create rings around lights.

Monofocal vs multifocal side by side

Factor Monofocal IOL Multifocal / trifocal IOL
Focus One distance (usually far) Far, intermediate and near
Reading glasses Usually needed Often not needed
Halos and glare at night Uncommon More common, often easing over about 3 months
Contrast in dim light Best Slightly reduced
Suitability with eye disease Suits most eyes Often avoided with macular disease or glaucoma
Astigmatism Toric versions available Toric versions available
Seoul price per eye (2026) Low end of ₩1.5M–₩7.5M cataract range About ₩4.5M–₩6.5M (≈$3,300–$4,800)
Typical stay in Seoul About 5–7 days About 5–7 days

Prices are per eye and were checked in 2026; dollar figures are approximate at ₩1,350–1,400 per dollar. Foreign visitors normally pay the full self-pay price. See cataract surgery cost in Korea.

What does the evidence show?

The best summary evidence confirms the trade-off: more independence from glasses, but more halos.

A Cochrane systematic review of 20 randomised trials with 2,230 people, published in 2016, found distance vision was similar with multifocal and monofocal lenses. People with multifocal lenses were less likely to need glasses and had better near vision, although the size of that benefit was uncertain. Halos and glare were both more common with multifocals. Lens designs have advanced since many of those trials, but the basic trade-off still applies.

Are there options in between?

Yes. Extended depth of focus (EDOF) lenses and monovision both aim for useful near or intermediate vision with fewer halos than a full multifocal.

An EDOF lens, such as Alcon Vivity, stretches the focal range from distance to arm's length; most people still need weak readers for small print. With monovision, one eye gets a monofocal set for distance and the other a monofocal set slightly near-sighted, which many people adapt to well. Trying monovision first with contact lenses is a sensible test. These options are worth discussing if you drive a lot at night or have mild eye disease. See presbyopia treatment in Korea.

What are the risks of lens surgery?

The surgery is the same whichever lens you choose; the lens type mainly changes the quality-of-vision trade-offs.

Risks shared by both include infection, inflammation, raised eye pressure, swelling at the back of the eye and, rarely, retinal detachment, which is more likely in very short-sighted eyes. A common later issue is clouding of the capsule behind the lens, treated with a quick YAG laser. Multifocal lenses are less forgiving of small errors: leftover astigmatism or a slightly off-centre lens affects them more, so precise measurements and sometimes a laser touch-up are needed. Dry eye should be treated before measurements, as it distorts them.

Who should choose which?

A monofocal lens often suits you if you:

  • Drive at night often, or do precision work in low light
  • Have macular degeneration, glaucoma or other eye disease
  • Are happy to wear reading glasses, or want the lowest cost

A multifocal lens often suits you if you:

  • Want to read, use a phone and see far mostly without glasses
  • Have otherwise healthy eyes and a regular cornea
  • Can accept rings around lights at night, at least for the first months

Personality matters too: perfectionists who notice small visual flaws tend to be less happy with multifocals. If you are under about 45 and only want to stop wearing glasses, compare lens surgery with ICL first.

How do I decide in Seoul?

Ask for a full lens consultation with measurements of your cornea, macula and tear film before choosing a lens, and get the lens model named on your quote.

Useful questions: which exact lens is proposed and why; whether a toric version is needed; what happens if you cannot adapt (lens exchange is possible but adds risk); and how many weeks you should stay for checks. Most patients have one eye done at a time, a few days apart. Bring your glasses prescription and any earlier eye records. See questions to ask your surgeon.

Sources

Key facts

  • Monofocal IOL: one focal point; reading glasses usually needed if set for distance
  • Multifocal / trifocal IOL: several focal points, e.g. Alcon PanOptix; less need for glasses
  • Evidence: Cochrane review of 20 trials (2,230 people): similar distance vision, better near vision and more halos with multifocals
  • Seoul price (per eye, 2026): multifocal about ₩4.5M–₩6.5M; cataract surgery overall ₩1.5M–₩7.5M by lens
  • Middle ground: EDOF lenses and monovision
  • Prices: multifocal lens cost in Korea

Independent directory. Prices are typical ranges reported by Seoul clinics and change often. Always confirm a written quote and get a full eye exam before booking. This page is general information, not medical advice.

FAQ

Frequently asked questions

Is a multifocal IOL worth the extra cost?

For people who strongly want to be free of glasses and have healthy eyes, often yes. Cochrane evidence shows less need for glasses, but more halos and glare than monofocal lenses.

Do halos go away with a multifocal lens?

They usually become less noticeable over about three months as the brain adapts, but some people keep seeing rings around lights at night.

Will I need glasses with a monofocal IOL?

Usually for reading, if the lens is set for distance. Monovision or an EDOF lens can reduce this.

How much is a multifocal lens in Korea?

In Seoul, multifocal lens surgery costs about ₩4.5M–₩6.5M per eye, based on 2026 checks. Monofocal cataract surgery costs much less.

Can a multifocal IOL be replaced?

Yes, a lens exchange is possible if you cannot adapt, but it is another operation with its own risks, so choose carefully the first time.

Planning vision correction in Seoul?

Compare clinics by district, check 2026 price ranges, and read our step-by-step planning guide for international patients.