Trifocal and other premium lenses free many people from glasses, but no eye operation is free of risk, and knowing the likely trifocal lens problems in advance makes them easier to recognize and manage. This guide explains the side effects people notice most, the rarer complications, how often each occurs and how it is treated, and ends with a balanced look at whether lens replacement is worth it.
The risks apply to both cataract surgery and refractive lens exchange, which are the same operation; the optical side effects depend mainly on the lens design. For an overview, see lens replacement surgery.
What are the risks of lens replacement surgery?
UK patient guidance puts the chance of a serious complication at about 1 in 1,000. Most problems people notice are milder and treatable:
| Problem | How often | How it is managed |
|---|---|---|
| Halos, glare, starbursts | Halos about 3.6 times as likely with multifocal as with monofocal lenses | Usually fade over weeks to months; rarely, lens exchange |
| Dark crescent at the edge of vision | Persists in about 3% of eyes at one year | Time; if needed, repositioning the optic, a piggyback lens or exchange |
| Lower contrast | Slight, by design, with diffractive lenses | Lens choice: EDOF or monofocal if the retina is not healthy |
| Dry eye | A common cause of blurred or fluctuating vision | Treatment before and after surgery |
| Leftover prescription | Less predictable in long, short or previously lasered eyes | Glasses, a laser touch-up or, rarely, lens exchange |
| Capsule clouding (PCO) | About 1 in 3 within five years | A quick YAG laser treatment |
| Infection inside the eye (endophthalmitis) | 0.02% of NHS operations, 2022–23 | Emergency antibiotics injected into the eye; sometimes vitrectomy |
| Swelling of the central retina (cystoid macular edema) | About 0.1–2.35% noticeable; 4–11% seen only on scans | Anti-inflammatory drops; most improve within 3–12 months |
| Tear in the lens capsule during surgery | 0.79% of NHS operations, 2022–23 | Surgery is adapted; later swelling or detachment becomes more likely |
| Retinal detachment | 0.51% over a mean of 4.7 years; 9.5% in men under 60 with eyes longer than 25 mm | Urgent retinal surgery |
| Late dislocation of the implant | 0.1% at 10 years, 0.7% at 20 years, 1.7% at 25 years | Repositioning, fixing the lens to the eye wall, or exchange |
Common trifocal lens problems: halos, glare and starbursts
Doctors call unwanted light images after lens surgery dysphotopsias. Positive ones add light: halos (rings around lights), glare and starbursts (spiky rays), most noticeable at night, which is why people search for "halos after lens replacement". Negative dysphotopsia is a dark crescent at the edge of vision.
Multifocal lenses divide light between several focal points, so the brain receives one sharp image and fainter, out-of-focus ones, and lights at night can look ringed. A Cochrane review of 20 trials found halos about 3.6 times and glare about 1.4 times as likely with multifocal as with monofocal lenses. Far fewer people are seriously troubled: in the US trial of the PanOptix trifocal, 2.4% were "bothered very much" by halos, 1.6% by glare and 4.8% by starbursts, against 0.9% for each with a monofocal lens. Early after surgery, up to 49% of patients report positive dysphotopsia, and most of these symptoms fade within weeks.
Lower contrast. Diffractive designs send part of the light to their other focal points, so contrast sensitivity — seeing shades of gray at dusk or in fog — is slightly reduced. In the PanOptix trial the difference was not judged clinically meaningful. It matters more when the retina has already lost contrast, as in macular degeneration; EDOF lenses generally reduce contrast less than multifocal ones (see EDOF lenses).
How long does it take to adapt to a trifocal lens?
The brain gradually learns to favor the sharp image and ignore the blurred ones. This neuroadaptation takes time:
| After surgery | What to expect |
|---|---|
| First days | Vision sharpens; halos around lights are often obvious at night |
| First weeks | Most dysphotopsia starts to fade |
| About 3 months | In a brain-imaging study, visual-disturbance scores fell from 2.82 at one week to 1.82 |
| About 6 months | Scores reached 1.14, comparable with monofocal lenses |
| One year | A persistent dark crescent remains in about 3% of eyes |
Treating dry eye and any leftover prescription helps. If symptoms stay troublesome for several months, options include repositioning the lens optic, adding a "piggyback" lens or exchanging the implant. Exchange is uncommon: in the PanOptix trial, one lens was removed because of dissatisfaction.
What else can blur vision after lens replacement?
Reviews of people unhappy after premium lens surgery point to three common, treatable causes.
Dry eye. An unstable tear film makes vision fluctuate and can distort the measurements used to choose the lens, so European guidance recommends diagnosing and treating it before surgery.
A leftover prescription. Modern formulas are accurate in most eyes, but eyes that are unusually long or short, or have had laser surgery, are harder to predict. Multifocal lenses depend on an accurate result, so a small error can matter. Options include glasses for specific tasks, a laser touch-up or, rarely, a lens exchange. Ask which enhancements your quote includes; see lens replacement costs.
Capsule clouding. About 1 in 3 people develop posterior capsule opacification within five years, and vision blurs again. A quick YAG laser treatment clears it; see secondary cataract.
Which complications need urgent care?
Infection, retinal detachment and a shift of the implant are rare but need prompt treatment. A dislocated lens causes sudden blur or double vision; swelling of the central retina shows as blurred or distorted central vision, often 4–6 weeks after surgery. Diabetes and uveitis raise the chance of macular swelling, long nearsighted eyes the chance of retinal detachment, and pseudoexfoliation, which weakens the lens supports, the chance of late dislocation; see complex cataract surgery.
Who has a higher risk of problems with trifocal lenses?
Specialist reviews list situations in which multifocal lenses are avoided or used with caution:
- retinal disease: retinitis pigmentosa and Stargardt disease are listed as contraindications, and in macular degeneration diffractive designs are generally avoided because they reduce contrast;
- optic nerve disease, including glaucoma;
- irregular corneal astigmatism;
- small pupils or weak lens supports, because a lens decentered by 0.75–1.00 mm already degrades multifocal optics.
If you drive a great deal at night or work in dim light, an EDOF lens or monovision may suit you better; European guidance links both with significantly fewer halos. See choosing a lens.
Is lens replacement worth it?
For many people it is, depending on what you want and on your eyes.
What you gain. In the Cochrane review, people with multifocal lenses were roughly a third less likely to depend on glasses. In the PanOptix trial, 49.6% read at about 20/20 level without glasses, against 0.9% with a monofocal lens. The implant is designed to last for life and cannot develop a cataract.
What you accept. Halos, glare and slightly lower contrast, especially at night, with adaptation over months; rare but serious risks, which weigh more in elective surgery; and the cost, as premium lenses and refractive lens exchange are usually paid privately.
European guidance describes those who suit presbyopia-correcting lenses: otherwise healthy eyes, a strong wish to be free of glasses and realistic expectations. If you mainly want sharp distance vision and do not mind reading glasses, a monofocal lens may serve you well with fewer side effects; if you are younger or nearsighted, see RLE vs LASIK and ICL. Before deciding, ask which lens is recommended for your eyes and why, what your personal risk factors are, and what happens if halos or a small prescription remain.
Frequently asked questions
Will the halos go away?
For most people they become much less noticeable. In a brain-imaging study, visual disturbance after multifocal lens surgery fell steadily and was comparable with monofocal lenses by six months. Some people still see faint rings around lights at night, but few are seriously bothered.
Can a trifocal lens be removed or replaced?
Yes. If side effects remain troublesome despite time and treatment of any dry eye or leftover prescription, the implant can be exchanged for a different design. This is uncommon and is a further operation with its own risks, so raise persistent problems with your surgeon early.
Can I drive at night after trifocal lens surgery?
Most people can, once their vision meets the legal standard and their surgeon agrees. Halos around headlights are common in the first weeks and usually lessen. If you drive a great deal at night, ask whether an EDOF lens or monovision would suit you better.
Is lens replacement surgery painful?
It is usually not painful. The eye is numbed with drops or a local anesthetic, and you stay awake. Afterwards the eye may ache or feel gritty for a few days; increasing pain is not normal and should be reported the same day.
Are complications more common with trifocal lenses than with monofocal lenses?
The surgical risks, such as infection or retinal detachment, are the same, because the operation is the same. What differs are the optical side effects: halos, glare and reduced contrast are more common with multifocal designs, and a small leftover prescription affects them more.
References
- Royal College of Ophthalmologists and RNIB. Understanding Cataracts. 2025. rcophth.ac.uk
- de Silva SR, et al. [Cochrane review: multifocal versus monofocal intraocular lenses]. Cochrane Database of Systematic Reviews, 2016. cochranelibrary.com
- US Food and Drug Administration. [Summary of Safety and Effectiveness Data: AcrySof IQ PanOptix, P040020/S087]. 2019. accessdata.fda.gov
- EyeWiki (American Academy of Ophthalmology). Dysphotopsia. eyewiki.aao.org
- [fMRI study of neuroadaptation after multifocal lens implantation]. Frontiers in Neuroscience, 2021. frontiersin.org
- Braga-Mele R, et al. [Multifocal intraocular lenses: indications and contraindications]. Journal of Cataract & Refractive Surgery, 2014. sciencedirect.com
- European Society of Cataract & Refractive Surgeons. [Recommendations for cataract surgery, 2024]. escrs.org
- National Ophthalmology Database Audit. [National cataract audit, 7th annual report]. 2024. nodaudit.org.uk
- EyeWiki (American Academy of Ophthalmology). Pseudophakic Cystoid Macular Edema (Irvine-Gass Syndrome). eyewiki.org
- ESCRS EuroTimes. Cataract surgery patients owed a personalised discussion of retinal detachment risk [report of Swedish register data, Thylefors et al.]. escrs.org
- Pueringer SL, et al. [Late intraocular lens dislocation: population-based study]. American Journal of Ophthalmology, 2011. sciencedirect.com
- Retina Today. [Intraocular lenses and macular degeneration]. 2024. retinatoday.com