Am I a Candidate for SMILE Pro?

Why an examination decides this

Refractive surgery removes tissue from the cornea permanently. Once it is gone it cannot be replaced, which is why the preoperative assessment carries more weight than the procedure itself. Everything below is a factor in that assessment, and every one of them is a measurement, not an opinion.

Age considerations

The relevant question at the lower end is not a birthday but whether your prescription has stopped changing. Operating on a refraction that is still moving increases the chance of a residual error, because the target is moving.

At the upper end, the issue is different. Reading vision changes with age for almost everyone, and surgery does not change that. If you are approaching the point where reading glasses become likely, the useful conversation is about how surgery will affect your reading vision and what that will feel like day to day, rather than about a cut-off age.

A stable prescription

Surgeons look for a refraction that has been consistent over time. How long counts as stable is a clinical judgement (different surgeons apply different thresholds) but the requirement itself is universal.

Bring any previous prescriptions or spectacle records you can find. Eyewear history is often the simplest evidence of stability, and in Dubai, where many residents have arrived recently, a patient's former optometrist records are frequently unavailable.

Short-sightedness (myopia)

Short-sightedness is the primary indication for SMILE. Treatable ranges exist, but they depend on the platform, your corneal thickness and the surgeon's judgement, which is why we do not publish a numeric range: a figure from one surgeon's practice does not transfer to another's.

The useful question at an assessment is not "what is the maximum you treat" but "where do my measurements sit relative to your limits, and how much margin does that leave".

Astigmatism

SMILE corrects myopic astigmatism: astigmatism occurring alongside short-sightedness. Because astigmatism has a direction as well as a magnitude, correct rotational alignment affects the outcome. Newer platform generations include automated alignment features intended to help with this; you can ask how alignment is confirmed for your eye.

Astigmatism without short-sightedness is a separate question. Ask specifically whether your surgeon treats it with this technique, rather than assuming that correcting some astigmatism means correcting yours.

Long-sightedness (hyperopia)

Long-sightedness is not a routine SMILE indication on the platforms in widespread use. Availability varies between markets, platform generations and surgeons, and some hyperopic lenticule approaches have been studied without becoming routine.

If a clinic offers hyperopic SMILE, the reasonable questions are how many such procedures the surgeon has performed, what the local regulatory position is, and what published outcomes exist for the hyperopic technique specifically rather than for SMILE generally.

Corneal thickness and shape

This is the factor that most often decides the answer, and the one a patient is least likely to have been told about.

• Thickness (pachymetry). A lenticule has to come out of somewhere. If the remaining cornea would be too thin, the procedure is not appropriate, and a surgeon who says so is protecting you from a rare but serious complication called ectasia, in which the cornea weakens and bulges.
• Shape (topography). Irregular patterns, or indications of keratoconus or a related condition, are a contraindication. This is one area where imaging is not optional: a normal-looking refraction can sit on top of an abnormal cornea.

Ask for your numbers. Corneal thickness in microns and your topography result are data about your own body, and a clinic that will not share them is worth a second thought.

How the cornea focuses light

National Eye Institute, NIH · Medical institution The Visual System: How Your Eyes Work

Third-party video Published by the National Eye Institute, part of the US National Institutes of Health. A foundational explanation of how the eye focuses light, including the role of the cornea. It does not discuss refractive surgery and has no commercial interest in it. Watch on YouTube (opens in a new tab)

General eye health

A dilated examination checks the retina, the optic nerve and the lens. Conditions found here glaucoma, retinal problems, early cataract: do not automatically rule refractive surgery out, but they change both the risk picture and the follow-up plan, and sometimes they change the whole plan entirely.

Because refractive surgery alters how corneal thickness and eye pressure read, a known history of glaucoma or ocular hypertension is particularly relevant. Mention it, even if it feels unrelated.

Dry eye and the ocular surface

Every refractive procedure disrupts corneal nerves, which affects the feedback loop that keeps the eye comfortable. If your ocular surface is already compromised, surgery can make it worse, and the discomfort may be more noticeable than the vision improvement is welcome.

This is why tear film and ocular surface assessment belongs in the preoperative work-up rather than in the postoperative complaints. Mild, well-controlled dry eye may not be a barrier. Significant or untreated ocular surface disease often means treating the surface first, delaying, or advising against refractive surgery altogether.

A clue worth volunteering: if contact lenses have become progressively less comfortable over years, that is often a dry-eye signal in disguise, and it is directly relevant here.

Dry eye, explained by an ophthalmologist

Michael Chua, MD · Named clinician How to Treat Dry Eyes Like an Ophthalmologist

Third-party video Presented by Michael Chua, a named practising ophthalmologist, for a general audience. It covers how dry eye is assessed and managed. It is not surgical advice and it is not about SMILE specifically: dry eye matters here because it is one of the factors assessed before any refractive surgery. Watch on YouTube (opens in a new tab)

Previous eye surgery

Prior refractive surgery, corneal transplants, some retinal procedures and significant trauma all change the assessment, and some make lenticule extraction inappropriate. Where records exist, bring them: a previous operative note is more useful than any recollection of it.

Systemic health and medication

Some systemic conditions and their treatments are associated with poorer corneal healing or a higher risk of ocular surface problems. Whether they rule surgery out depends on the specific condition, how well it is controlled and which medication you take.

Disclose everything, including supplements and anything bought over the counter. And if you are unsure whether something is relevant, say it anyway: deciding relevance is the clinician's job, not yours.

Pregnancy and breastfeeding

Refractive surgery is generally deferred during pregnancy and breastfeeding. Hormonal changes affect refraction, tear film and corneal hydration, which makes measurements less predictable and the result harder to judge. Clinics typically ask you to wait until a period after breastfeeding has ended, so that the assessment is taken from a stable baseline.

Candidate education checklist

This is not a screening test and it produces no result. It walks through the categories a clinician works through, so you know what the assessment is for and what to ask about. Ticking a box does not mean you are suitable, and leaving one unticked does not mean you are not.

What to do with all of this

Use this page to prepare, not to conclude. The most useful outcomes of reading it are that you know which measurements to ask for, you know why tear film belongs in the conversation, and you are harder to rush.

Two practical suggestions. First, ask for your measurements in writing: you will want them, and comparing them between two clinics is the single most informative thing you can do. Second, if one surgeon declines and another accepts, that is not automatically a reason to prefer the second. It is a reason to ask the second surgeon why, specifically.