Swim, ride, run: see clearly with nothing on your eyes
Triathlon is the sport that convinced me to take an interest in athletes' vision. A contact lens lost in the first metres of an open-water swim means an entire race blind to the buoys, then to the road signs on the bike. This page is for swimmers, triathletes, surfers, open-water swimmers and aquabike enthusiasts who want reliable vision in and out of the water.
Blurry underwater, sharp out of the water
- Underwater, the eye can no longer focus. The cornea loses its optical power in contact with water, hence the blur without goggles — short-sighted or not. What makes the difference is vision out of the water: buoys, pool clock, road signs, transitions.
- Contrast and glare. Sunrise starts, reflections on the water, rain on the bike: contrast sensitivity and optical quality matter more than raw acuity.
- Sighting in open water. Lifting your head every 6 to 10 strokes to find a buoy 200 m away requires good distance vision; an uncorrected −2 D myope is literally swimming at random.
Contact lenses in water: I strongly advise against them without watertight goggles. Pool, lake and sea water contain micro-organisms — including amoebae — able to colonise a lens and cause severe keratitis. A lens under well-sealed swimming goggles, discarded after the session, is an acceptable compromise; a lens in open water without protection is not.
The pitfalls of glasses and contact lenses
Simple and safe in the pool, with lenses in each eye's prescription. Less practical in open water (fogging, limited tints) and useless once out of the water: you need glasses or contact lenses again in transition.
Possible with daily disposables discarded after the session, and only if the goggles stay sealed. Dryness is then common in the wind on the bike. Never without goggles.
Fogging, rain, time lost in T1, reduced field in the aero position. Prescription sports frames limit the problem without removing it.
Orthokeratology, my first suggestion for swimmers who cannot have surgery
Rigid lenses worn overnight temporarily flatten the cornea; on waking you remove them and see clearly all day, with nothing on your eyes. No lens in the water, no glasses on the bike.
This is the solution I offer teenagers, still-progressing myopia and anyone who does not want surgery. It is reversible when you stop wearing the lenses and requires regular follow-up at the practice.
Who is it for? Under-18 swimmers, low to moderate progressing myopia, athletes who want to try life without correction before considering surgery, and anyone who refuses contact lenses in the water once and for all.
Which surgery for a swimmer or triathlete?
The main constraint is not impact, it is water and the time without immersion. All four techniques are possible; the choice depends on the cornea (Anterion topography), the prescription and the calendar.
| Technique | For whom | Water-related point |
|---|---|---|
| SMILE | Myopia up to −10 D, astigmatism up to −5 D, hyperopia up to +5 D, compatible cornea | Micro-incision: protected return to water around week 2 once cleared, open water week 4 |
| LASIK | Myopia, hyperopia up to +5 D, astigmatism; recovery in 24–48 h | Corneal flap: avoid any rubbing and any unprotected immersion before week 4 |
| PRK / Trans-PRK | Thin cornea, moderate prescriptions | Surface healing over 1–2 weeks: no water until fully healed |
| ICL / IPCL | High myopia, corneas unsuitable for laser | Micro-incision; same water timelines as the other techniques |
Return timeline
| Activity | Return (once cleared) |
|---|---|
| Walking, indoor trainer without sweat in the eyes | Day 1–2 |
| Running, road cycling with protective glasses | Day 2–3 |
| Pool swimming with watertight goggles | ~Week 2 |
| Open water, sea, surf, unprotected | Week 4 |
| Triathlon race | Week 4 |
| Scuba diving | Month 1 |
Indicative timelines: each step is cleared at the post-operative check-up; the instructions given in consultation take precedence.
I know what a pair of leaking swimming goggles does to a race start.
I swim, ride and run as an amateur. For a triathlete, refractive surgery is not a comfort: it is a matter of safety in open water and on the road. I time the surgery to your season — after the main goal, or during a recovery phase — so that the weeks out of the water cost you nothing.
Your questions
Swimming without contact lenses starts with an assessment
Sports vision assessment in Boulogne-Billancourt: refraction, ocular surface, Anterion topography, and a plan — orthokeratology or surgery — timed to your season.