For divers who love the ocean, clear vision is not only essential for enjoying the underwater experience — it is also a critical factor for safety beneath the surface. Many divers consider laser eye surgery to free themselves from the hassle of prescription masks or contact lenses. However, with so many procedures available, which one is best suited for those of us who are active underwater? This article focuses on two mainstream procedures that are particularly well-suited for divers in Taiwan: SMILE minimally invasive surgery and TransPRK (including Smart TransPRK). We will take an in-depth look at the surgical principles, pros and cons, ideal candidates, and the post-operative recovery periods that divers care about most — helping you make the best decision for your needs.
SMILE Laser Eye Surgery
How SMILE Works
SMILE, also known as "Small Incision Lenticule Extraction," uses a femtosecond laser to precisely cut a "lenticule" inside the cornea, which is then removed through a tiny 2–4 mm incision. Once the lenticule is removed, the curvature of the cornea changes, correcting myopia and partial astigmatism. Because no corneal flap is created, the impact on the corneal surface is minimal, corneal nerves are largely preserved, and the risk of dry eye after surgery is low.
Pros and Cons of SMILE
Pros:
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Fast recovery: Post-operative discomfort (foreign body sensation, light sensitivity) typically subsides within a few hours to one day, and vision stabilises quickly.
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Low dry eye risk: The majority of corneal nerves are preserved, keeping tear production stable.
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No flap risk: Eliminates the possibility of corneal flap displacement caused by water pressure or impact while diving.
Cons:
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Narrower prescription range: Suitable for moderate to high myopia and mild to moderate astigmatism; not suitable for high astigmatism or hyperopia.
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Higher cost: Precision equipment makes this procedure more expensive than other options.
Who Is SMILE Best For?
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Those who need a rapid return to clear vision.
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Those with moderate to high myopia and astigmatism within the correctable range.
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Those who prioritise post-operative comfort and safety.
TransPRK Laser Eye Surgery
How TransPRK Works
TransPRK is a "no-touch" laser procedure that ablates the cornea directly at the surface. The laser first removes the corneal epithelium, then reshapes the curvature of the corneal stroma to correct vision. Epithelial cells regenerate on their own within a few days after surgery. Smart TransPRK uses an intelligent algorithm to optimise the laser path, resulting in a smoother ablation and better recovery.
Pros and Cons of TransPRK
Pros:
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No flap risk: Extremely safe under water pressure or in the event of an impact.
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Good corneal strength retention: High long-term stability.
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Wide prescription range: Suitable for myopia, hyperopia, and high astigmatism; also appropriate for divers with thinner corneas or larger pupils.
Cons:
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Longer recovery period: Epithelial healing takes approximately 3–7 days, with initial foreign body sensation, light sensitivity, and pain.
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Slower vision stabilisation: Full stabilisation takes approximately 1–3 months, and longer for some individuals (depending on constitution and post-operative care).
Who Is TransPRK Best For?
TransPRK is suitable for the following divers:
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Those with relatively thin corneas or larger pupils.
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Those who wish to preserve corneal thickness to the greatest extent possible.
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Those requiring correction across a wide prescription range (including hyperopia and high astigmatism).
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Those who can tolerate a longer initial period of discomfort and visual recovery after surgery.
How Long After Laser Eye Surgery Can You Dive?
Regardless of which procedure you choose, it is recommended to wait at least 1 month. The recovery time required for TransPRK will be somewhat longer than for SMILE. Before returning to diving, be sure to have an ophthalmologist confirm that your cornea has healed and your vision is stable, and take extra care to protect your eyes to minimise the risk of infection.
Surgery Comparison
| SMILE | TransPRK | |
|---|---|---|
| Pre-operative corneal thickness | At least 480 μm (subject to clinic requirements) | At least 250 μm (subject to clinic requirements) |
| Prescription range | 500–1000 | 200–800 |
| Astigmatism limit | Approx. 300–500 degrees | Approx. 300–500 degrees |
| Surgery duration | 20 seconds per eye | Depends on prescription |
| Recovery period | 3–7 days | 1–3 months |
| Dry eye level | Low | Low |
| Post-operative pain | Virtually none | 1–3 days |
| Post-operative vision stability | Within approximately one week | Within approximately 1–3 months |
| Corneal nerve damage | Minor | Moderate |
| Disruption to original corneal structure | Minimal | None |
Conclusion and Recommendations
Both SMILE and TransPRK are diver-friendly "flapless" laser eye surgery procedures, and both are far safer than traditional LASIK. Your choice should take into account your own corneal condition, degree of myopia, tolerance for recovery time, and diving needs.
Before surgery, be sure to undergo a comprehensive ophthalmological evaluation (including corneal thickness, intraocular pressure, and tear secretion), and proactively inform your doctor of your diving habits. Choosing the right procedure will allow you to safely and freely enjoy the beauty of the underwater world!
Further Reading
