A Malyugin ring is a small, square-shaped ring made of fine, flexible material that a surgeon inserts to hold a small or floppy pupil open during cataract surgery. It is used when a pupil does not dilate enough — often because of intraoperative floppy iris syndrome (IFIS), certain prostate or blood-pressure medications, previous inflammation or pseudoexfoliation. The ring is placed at the start of the operation and removed before the end, allowing safe, controlled cataract surgery with your chosen lens. At our partner clinics, cataract surgery starts from £2,900 per eye all-inclusive, with the pupil-expansion device included where clinically needed.
What is a Malyugin ring?
Cataract surgery needs a well-dilated pupil so the surgeon can see and safely remove the cloudy lens. In most patients, dilating drops widen the pupil enough. In some eyes the pupil stays small or becomes floppy and billows during surgery, which raises the risk of complications.
The Malyugin ring solves this. It is a single-use pupil-expansion device with rounded loops (scrolls) at each corner that gently engage the pupil edge and hold it open in a stable, round shape throughout the operation. It creates a clear, safe working space, is removed at the end of surgery, and leaves the pupil to return to normal. Alternative devices such as iris hooks may be used in some cases; your surgeon selects the safest option for your eye.
When a pupil-expansion ring is needed
Your consultant may plan to use a Malyugin ring (or advise it is on standby) if you have any of the following:
- Intraoperative floppy iris syndrome (IFIS) — most often linked to tamsulosin and other alpha-blocker medications used for the prostate, even if you stopped them some time ago.
- A naturally small pupil that does not widen fully with drops.
- Pseudoexfoliation, which can weaken the iris and lens support.
- Posterior synechiae — scarring that tethers the iris, often after previous uveitis or inflammation.
- Previous eye surgery or trauma affecting the iris.
It is important to tell your surgeon about all medicines you take, especially tamsulosin, so the team can plan ahead. The ring is compatible with the full range of intraocular lenses, including monofocal, EDOF, multifocal and toric lenses. Small pupils can also be managed with the help of femtosecond laser-assisted surgery in selected cases.
Been told your pupils are small, or take tamsulosin? A consultant assessment lets us plan safe, tailored cataract surgery for your eyes.
Book a cataract assessmentWhat happens during the procedure
Small-pupil cataract surgery with a Malyugin ring is a day-case procedure under local anaesthetic eye drops. You stay awake and feel no pain. Using the ring adds only a few minutes to the operation.
- Numbing drops are placed in your eye and it is cleaned and prepared.
- The surgeon makes a tiny self-sealing corneal incision, as in standard surgery.
- The Malyugin ring is inserted through the same incision and its four scrolls engage the pupil edge, holding it open in a stable circle.
- The cataract is removed by phacoemulsification and your chosen intraocular lens (IOL) is implanted.
- The ring is removed, the eye is checked and shielded, and you rest before going home.
Anxious patients can ask about conscious sedation. Complex cataracts, such as a posterior polar cataract, may need additional techniques your surgeon will explain.
Recovery week-by-week
Recovery is the same as for standard cataract surgery. The pupil settles back to normal, and most patients notice clearer vision within a day or two.
Day of surgery
Vision is hazy for a few hours; the pupil may look slightly larger briefly. Eye shield for the first night. Drops begin.
Days 1–3
Vision clears noticeably. Mild grittiness or watering is normal. Most return to gentle activities and reading.
Week 1
First post-op review. Most patients are back to driving and working — no swimming or eye rubbing yet.
Weeks 2–4
Vision continues to refine. Drops continue. New glasses prescription, if needed, at week 4–6.
Beyond a month
Final vision is settled. Second eye scheduled if both are being treated.
Ask your surgeon about dropless cataract surgery, and about treating both eyes in one session where suitable.
Small-pupil cataract surgery cost
Cataract surgery is priced as an all-inclusive package: consultation, biometry, the surgery and theatre, your IOL of choice, post-op drops and follow-up reviews. Where a pupil-expansion ring is needed for a small or floppy pupil, it is normally included in a complex-cataract package.
- Self-pay: from £2,900 per eye for a monofocal lens; EDOF and multifocal lenses cost more. A modest complexity supplement may apply for demanding cases.
- Insurance: recognised by Bupa, AXA, Aviva, Vitality and others — we handle authorisation.
- Finance: 0% finance available over 12 months.
See the full breakdown on our cataract surgery cost guide.