Summary:
- A changing prescription does not rule you out for SMILE® Pro 2.0. What matters is whether it has stopped moving, not how much it has shifted in the past.
- Ophthalmologists look at your full prescription history across consecutive years, not just your most recent pair of glasses.
- Temporary factors like pregnancy, intensive screen use, and hormonal changes can cause short-term shifts that do not reflect true myopia progression.
- If your prescription is still changing, options like myopia control and regular monitoring can help you work toward eligibility in the meantime.
You have been meaning to look into SMILE® Pro 2.0 for a while now. But every time you book an eye check, your prescription has shifted slightly, and you leave thinking the same thing: perhaps next year.
The frustrating part is not knowing whether you are genuinely unsuitable or simply not eligible yet. Prescription stability is a requirement for laser vision correction, but it is one that is frequently misunderstood. A changing prescription does not automatically close the door.
Understanding what ophthalmologists actually look for, and what your options are in the meantime, can help you stop waiting and start making a plan.
Why Prescription Stability Matters Before SMILE Pro
SMILE® Pro 2.0 eye surgery works by permanently reshaping the cornea (the clear front surface of the eye) to correct how light is focused onto the retina. The reshaping is calculated precisely based on your current prescription. If that prescription continues to change after surgery, the correction achieved may no longer match what your eye needs, which could result in under-correction or a gradual return of blurred vision.
Any laser eye surgery for myopia faces the same challenge: the procedure targets a fixed endpoint, and a moving target undermines the result.
Prescription instability is most common during adolescence and early adulthood, when the eyeball is still growing and myopia (short-sightedness) tends to progress. For many people, this slows and plateaus by the early-to-mid twenties, though some individuals continue to experience shifts beyond this point, particularly those with higher degrees of myopia.
The general benchmark ophthalmologists apply is a change of no more than 0.50 dioptres (50 degrees) over a 12-month period, with most surgeons looking for at least one to two years of consecutive stability. Whether your prescription meets this threshold is something your doctor will assess by reviewing your full eye history, not just your most recent glasses or contact lens prescription.
My Prescription Changed Recently. Does That Rule Me Out?
A recent change does not necessarily mean surgery is off the table, but it does mean the timing is not right yet. The appropriate step is to monitor your prescription at regular intervals (typically every six to 12 months) and revisit the question once it has remained stable for the period your ophthalmologist advises.
Some prescription changes are temporary rather than a sign of ongoing progression. Prolonged close work, significant changes in screen usage, or hormonal changes including pregnancy can all cause transient shifts.
Pregnancy in particular is known to affect corneal shape and refractive status, with studies documenting a measurable myopic shift that typically returns to pre-pregnancy levels post-partum. Patients who are pregnant or breastfeeding are advised to postpone any assessment until several months after they have stopped breastfeeding and their prescription has stabilised.
Knowing whether a recent shift reflects true progression or a temporary fluctuation is precisely what a formal assessment is designed to determine, which brings us to what that assessment involves.
Not sure where your prescription stands? Book an eye assessment at Asia Pacific Eye Centre to find out where you stand.
What Your Eye Specialist Is Looking for Before Saying Yes
Prescription stability is one component of a broader SMILE® Pro suitability assessment. Your ophthalmologist is evaluating several factors simultaneously, each of which can independently affect whether SMILE® Pro 2.0 is appropriate for you.
| What is assessed | What the doctor looks for |
| Corneal thickness and shape | Sufficient corneal thickness for safe licitule removal; corneal topography checks for irregularities, including early signs of keratoconus, a condition where the cornea progressively thins and bulges outward |
| Prescription range | Short-sightedness between -1.00 and -10.00 dioptres and astigmatism up to -5.00 dioptres; prescriptions outside this range are not treatable with SMILE® Pro 2.0 |
| Overall eye health | Active dry eye disease, inflammatory eye conditions, or previous eye surgery that may affect candidacy; dry eye is assessed separately as corneal surgery can affect tear production |
| Visual goals and lifestyle | Your expectations and daily activities help determine whether SMILE® Pro 2.0 is the most appropriate option, or whether a different approach may suit you better |
Each of these factors is evaluated during the pre-surgery assessment at Asia Pacific Eye Centre, priced at $197 (excluding GST) as listed on our pricing page.
The assessment covers:
- Refraction testing
- Corneal mapping
- Eye pressure measurement
- Dry eye evaluation
- Doctor consultation to review all findings
Your Options While You Wait for Your Prescription to Stabilise
If your prescription has not yet reached the stability threshold, there are options worth discussing with an eye specialist in the meantime.
Myopia control
For younger patients whose prescription is still progressing. Options include low-dose atropine eye drops, orthokeratology lenses (contact lenses worn overnight to temporarily reshape the cornea), and certain spectacle lens designs. Asia Pacific Eye Centre offers dedicated childhood myopia management for younger patients.
Regular monitoring
For adults whose prescription has shifted slightly but may be approaching stability. Regular eye screenings every six to 12 months allow your ophthalmologist to track the pattern over time. Eye history across at least two consecutive years is typically what a surgeon needs before making a confident suitability assessment.
Implantable Contact Lens (ICL)
For patients whose prescription is still changing, or who have other features that make laser vision correction less suitable. Unlike SMILE® Pro 2.0, an ICL (a small lens implanted in front of the eye’s natural lens) is removable, which some patients find reassuring if their vision is still in flux. Suitability depends on your prescription, eye anatomy, and overall eye health.
The right path forward, whether it is SMILE® Pro 2.0, LASIK, ICL, or continued monitoring, depends on factors that only a proper examination can confirm.
The Next Step: Book a SMILE Pro Assessment at Asia Pacific Eye Centre
At Asia Pacific Eye Centre, assessments are carried out by fellowship-trained ophthalmologists. The assessment includes a full pre-surgery evaluation covering everything you need to know about your suitability and next steps.
To book an appointment, call +65 6470 3366, WhatsApp +65 9235 7063, or use our online form.
