Is SMILE Pro Safe? Risks and Side Effects Explained

“Safe” is not a property a surgical procedure either has or lacks. It is a comparison, and the honest way to assess it is to separate the things that are common and self-limiting from the things that are uncommon and consequential from the things that are rare and serious.

Is SMILE Pro safe?

SMILE has been performed since the early 2010s and has accumulated a substantial peer-reviewed literature, including comparative studies against LASIK and PRK and long-term follow-up work. Regulators in the markets where it is offered, including the UAE, treat it as an established refractive procedure.

That is a statement about the procedure in general. It is not a statement about your eyes, and it is not a guarantee. The most accurate summary is that SMILE Pro is a well-characterised procedure whose risks are understood, largely predictable, and manageable, which is a more useful thing to know than a reassuring adjective.

What side effects are common?

The side effects reported most often in the first weeks are:

Dryness. The most frequent complaint. Usually managed with lubricating drops and usually improving over weeks to months. For some people it lasts longer.

Glare and halos. Particularly around headlights and low-light sources. Commonly described as noticeable at night and diminishing as the surface settles.

Fluctuating vision. Clarity that varies through the day or between days. Frustrating, normal, and not a sign that something has gone wrong.

Light sensitivity and a gritty sensation. Most pronounced immediately after surgery and easing over the first days.

Temporary blurred or hazy vision. Often worst on the first evening.

None of these is unusual. What matters is whether they are improving and whether your clinic is expecting them. If a symptom is getting worse rather than better, that is the point to make contact rather than waiting for the next appointment.

What outcomes are less than ideal?

A refractive procedure aims at a prescription target, and it can miss it.

Under-correction leaves a residual prescription: you may still need glasses for some tasks, typically driving or night vision. This is the most likely imperfect outcome, and it is partly predictable from your original prescription and measurements.

Over-correction moves you slightly past the target in the other direction. Less common, and often more noticeable at close range, particularly for people in their forties.

Residual astigmatism after an intended full correction is another variation on the same theme.

Night-vision symptoms that persist. Most improve. A minority of people continue to see some glare or halos, and this is one of the outcomes least predictable in advance.

Need for enhancement. A second procedure to refine the result. Whether this is possible depends on how much corneal tissue remains, which is one reason conserving tissue matters during the first procedure.

What complications are rare?

Rare does not mean impossible, and these are the ones worth knowing by name:

• Infection (keratitis). The reason you are given antibiotic drops and told not to expose the eye to water in the early period.
• Inflammation inside the eye. Uncommon and treatable when recognised; also why follow-up matters.
• Delayed epithelial healing or surface problems, more likely where there is pre-existing surface disease.
• Lenticule-related technical issues during surgery, such as difficulty separating the lenticule. Specific to SMILE, and the reason surgeon experience is a real variable rather than a marketing one.

Serious sight-threatening complications are rare in this field, and the follow-up schedule exists to catch the ones that are treatable early.

What makes your own risk different?

Four things do most of the work:

Your measurements. Corneal thickness, topography, prescription and tear film quality determine whether you are a good candidate in the first place. A procedure performed on a cornea that should have been declined is a riskier procedure, regardless of technique.

Pre-existing dry eye. It changes the calculus, both for comfort afterwards and for measurement accuracy before.

Your age and prescription stability. Operating on a prescription that is still changing risks ending up with a result that is out of date.

The clinic. Case volume, equipment maintenance, whether the assessment was thorough, and whether the follow-up actually happens. A clinic that declines unsuitable candidates is giving you information about its standards.

What this means for you

Do not ask “is it safe?” and accept a one-word answer. Ask: what are the most common side effects and how long do they last; how often does this clinic see an under-correction in someone like me; is an enhancement included and what would prevent one; and what are the signs that should make me call you.

Write the answers down. A clinic that answers all four in specific terms, including the uncomfortable ones, is telling you more about your likely experience than any published success figure.

Our risks page lists the same material in more detail, and includes a printable checklist of questions to take to a consultation.