Refractive surgery and your eyelids: what an oculoplastic surgeon checks before LASIK, SMILE or lens surgery

Laser eye surgery is judged by the eye. The cornea is measured, the prescription is checked, and the thickness of the tissue decides what is allowed. The eyelids rarely get a mention, yet they decide how the surface of the eye behaves afterwards. This article sets out what an oculoplastic surgeon, a specialist in eyelids, tear ducts and the eye socket, would want checked before you book.

What are the main kinds of refractive surgery?

Refractive surgery changes how the eye focuses light so that you depend less on glasses. There are two families: operations that reshape the cornea, the clear front window of the eye, and operations that place or swap a lens inside the eye. Five names cover most of what is offered to adults.

LASIK uses a laser to reshape the cornea after a thin flap has been lifted. The American Academy of Ophthalmology reports that roughly nine in ten people who have it reach unaided vision somewhere in the 20/20 to 20/40 range, and that it cannot correct presbyopia, the normal loss of close-up focus that arrives around 40. SMILE, small incision lenticule extraction, uses a femtosecond laser to shape a disc of corneal tissue inside the cornea and removes it through an incision of about 2 to 3 mm, with no flap. PRK, surface laser, removes the thin outer layer of the cornea, the epithelium, and reshapes beneath it with no flap at all. AAO EyeWiki notes that the epithelium grows back over about three to four days under a bandage contact lens, and that steroid drops are used for up to four months to lower the risk of haze.

Two operations work inside the eye. An implantable contact lens (ICL) is a lens placed behind the iris and in front of your own lens, and EyeWiki describes it as reversible and as usually used for high prescriptions or when corneal surgery is not suitable. Refractive lens exchange removes your clear natural lens and replaces it, the same operation as cataract surgery without the cataract. EyeWiki points out that younger people, who still focus up close, are usually poor candidates, and that the risk of retinal detachment is higher in severe myopia. Little Eyes 101 explains the laser options from a parent's side in its guide to what LASIK, SMILE and PRK each do, and the lens options in its piece on implantable lenses for a high prescription.

Which lid problems can stop or delay laser surgery?

Inflamed eyelid margins and blocked oil glands are the commonest. AAO EyeWiki states that blepharitis and meibomian gland dysfunction must be identified and treated before LASIK, and lists uncontrolled blepharitis and dry eye as contraindications. Incomplete lid closure is the other major one.

Blepharitis, inflammation of the lid margin where the lashes grow, and meibomian gland dysfunction, blocked or poorly working oil glands in the lids, both thin out the oily layer of the tear film so that tears evaporate quickly. A surface in that state gives unreliable measurements, and EyeWiki says that measurements taken on a compromised surface carry error into the treatment plan. So the sensible order is to treat the lids, re-measure, and only then plan the laser. I explain the condition in my article on blepharitis, and the dry eye that follows laser surgery has its own page in dry eye and the meibomian glands before laser eye surgery.

Lagophthalmos, the medical name for eyelids that do not close fully, matters because the cornea depends on a complete blink. EyeWiki notes that an incomplete blink needs a different intervention from a simple shortage of tears, and its SMILE page lists exposure keratopathy, damage to the cornea from being left uncovered, among the absolute contraindications. Poor closure can come from facial nerve weakness, thyroid eye disease or earlier lid surgery. The causes are in my article on lagophthalmos.

Can a droopy lid, a heavy brow or a floppy eyelid matter?

Yes, for three different reasons: equipment, measurement and the cornea itself. A low brow or deep-set eye can make the laser's suction ring hard to seat, a droopy lid can change the shape of the cornea being measured, and a floppy eyelid often comes with heavy eye rubbing, which matters for corneal safety.

On the equipment, EyeWiki lists deep-set eyes, a narrow lid opening and a prominent brow as features that may prevent adequate suction ring placement. On measurement, the weight of a ptotic lid presses on the cornea. A 2026 review of eyelid disease and corneal shape cited a study in which topographic changes appeared only in eyes where the lid sat low, with a margin reflex distance under 2.5 mm, and concluded that ptosis surgery can reduce or induce astigmatism depending on age and technique. Whether the droop comes from the lid or from a heavy brow is a separate question, covered in hooded eyelid, ptosis or heavy brow and brow ptosis versus eyelid ptosis. Contact lens wear has its own effects on the lids, covered in my article on contact lenses and your eyelids.

Floppy eyelid syndrome, a loose upper lid that turns outward easily, matters for a different reason. StatPearls records that both keratoconus, a cone-shaped thinning of the cornea, and floppy eyelid are associated with heavy eye rubbing. The American Academy of Ophthalmology lists keratoconus among the reasons someone is not a LASIK candidate, and EyeWiki tells the surgeon to look for floppy eyelid signs. The same lid is strongly associated with sleep apnoea, as my article on floppy eyelid syndrome and sleep explains. My view is simple: if you rub your eyes hard, or your partner says your lids flip, say so before the corneal scan, not after. The way rubbing, a floppy lid and keratoconus fit together is followed through in my article on eye rubbing, floppy eyelids and keratoconus before LASIK.

Do thyroid eye disease and earlier eyelid surgery change the plan?

Both can. Thyroid eye disease alters the lids, the eye's position and the tear film, and earlier eyelid surgery can leave the lids slightly open or change the cornea's curve. Neither is a simple yes or no. In my view each calls for a stable lid position and a settled surface before any laser is planned.

In thyroid eye disease, the immune reaction behind the Graves' eye changes enlarges the muscles and fat in the socket and often pulls the lids open, so the cornea is exposed. The 2026 review above cites work in which Graves' ophthalmopathy was linked to more with-the-rule corneal astigmatism, causing new vision defects in 9% of those studied, and others in which orbital decompression altered corneal astigmatism. I have not found a trial that tests laser vision correction in active thyroid eye disease, so evidence here is thin. My view is that elective refractive surgery should wait until the disease is inactive and the lids and eye position have stopped changing. Exposure is the main worry, set out in my article on thyroid eye disease and corneal exposure. Why the eye must be stable first is set out in thyroid eye disease and laser eye surgery.

Earlier eyelid surgery matters too. StatPearls lists excessive tissue removal in blepharoplasty as one cause of lagophthalmos, and a lid pulled slightly down or open after surgery is covered in eyelid retraction after surgery. The surgeon planning laser surgery needs to know about every lid operation, with its date and what was done, as I describe in my guide to upper blepharoplasty and ptosis surgery for adults.

Should eyelid surgery or laser surgery come first?

When both are needed, eyelid surgery usually comes first, because it can change the cornea's shape and the tear film. A 2026 review concluded that corneal instability after extraocular surgery usually takes 3 months to 1 year to settle, and that refractive surgery should wait until stability is documented.

That is a review conclusion, not a rule for every operation, and the interval depends on the lid operation and the surgeon's measurements. The reasoning, the figures and what to tell each surgeon are in my article on which comes first and how long to wait. Little Eyes also writes about the reading-glasses problem that follows a laser in its guide to blended vision after 40, which is worth reading if you are over 40. If it is reading glasses you are worried about, a heavy lid or brow can make that problem worse, as I explain in reading glasses after 40, presbyopia options and why a heavy lid or brow makes it worse.

What should I ask before I book refractive surgery?

Ask what the surgeon checked on your lids and tear film, and what happens if those checks are abnormal. A candidate assessment that measures only the cornea has left half of the question open. The list below is the one I would want a friend to take along.

• Were my lid margins and oil glands examined, and is there any blepharitis or meibomian gland dysfunction to treat first?
• How was my tear film tested, and what was the result?
• Do my eyelids close fully, in a blink and in sleep?
• Does my lid position, brow or eye socket shape affect the equipment being used?
• Do I rub my eyes hard, snore, or have a thyroid condition?
• Have I had eyelid, brow or ptosis surgery, and how long ago?
• Which option do you advise for my eyes, and why not the others?
• If dry eye follows, who treats it and for how long?

The wider set of lid and surface articles sits on the refractive surgery and eyelids page and in the main journal hub. If the answers raise a concern, get the lids assessed by an eye specialist before you commit to a date. For the dry eye that so often follows, my article on dry eyes and the lid margin and dry eye after eyelid surgery are a good start. A scan taken on a dry surface measures the dryness as much as the eye. For the weeks after the laser itself, after laser eye surgery: dry eye, glare and the lid care that helps recovery covers what to expect.