LASIK and High-Altitude Mountaineering

What the Evidence Shows—and How to Prepare

As a cornea and refractive surgeon and a mountaineer, I understand why climbers ask whether LASIK is compatible with high-altitude expeditions.

The available evidence is generally reassuring. A history of LASIK does not automatically prevent high-altitude mountaineering. However, individual healing, ocular-surface health, and the demands of the expedition matter. Published studies are small, and some climbers have experienced visual fluctuations.

What Does the Research Show?

Experience on Mount Everest

A study of six climbers with previous LASIK found that five reported no visual changes up to approximately 26,400 feet. Some experienced blurred vision during their ascent, including at extreme altitude, which improved with descent or a longer stay at altitude.[1]

This supports the practical feasibility of mountaineering after LASIK while showing that visual stability is not guaranteed.

Changes after relatively recent surgery

An earlier report described two climbers who ascended to high altitude eight and fourteen weeks after LASIK. Both experienced reduced distance vision consistent with a temporary shift toward nearsightedness.[2]

These cases do not establish a universal waiting period or prove that visual changes occur only during early recovery. They emphasize the importance of planning surgery well before an expedition and confirming recovery before departure.

What wilderness guidelines say

The Wilderness Medical Society’s 2024 guidelines support the safety of LASIK and PRK at altitude, while grading the supporting evidence as low quality. They also acknowledge reports of blurred vision.[3]

The appropriate message is reassuring but qualified: many people function well at altitude after LASIK, but the evidence cannot exclude every complication.

LASIK Is Different From Radial Keratotomy

Radial keratotomy, or RK, is an older operation involving deep radial corneal incisions. Its tendency toward altitude-related refractive shifts should not be assumed to apply equally to LASIK.

The Wilderness Medical Society describes fewer refractive changes after LASIK and PRK than after RK. People with previous RK need a separate discussion about altitude and backup correction.[3]

Plan Surgery Around Your Expedition

Good vision soon after LASIK does not necessarily mean that healing and visual stability are complete. Dryness, glare, halos, or fluctuating vision may persist during recovery.[4]

Discuss your plans before choosing a surgery date. Your surgeon should know:

There is no single waiting period established by these studies that guarantees readiness for every climb. Clearance should reflect your examination, recovery, and itinerary.

Protect Your Eyes After Surgery

LASIK reduces dependence on vision correction for many patients, but it does not protect against UV exposure, wind, cold, or eye injury.

Use well-fitting UV-protective sunglasses or goggles with appropriate side coverage. Carry spare eyewear, lubricating drops recommended for your eyes, and backup prescription glasses if needed.[3]

Avoid rubbing your eyes, and follow your surgeon’s activity restrictions during recovery.[4]

Do Not Dismiss New Visual Symptoms

Sudden or persistent loss of vision, significant eye pain, marked light sensitivity, or a new dark area in your vision requires urgent assessment.

Stop ascending and arrange medical help. Descent or evacuation may be necessary. Do not assume that new symptoms are simply dryness or a temporary effect of previous LASIK.[3]

My Perspective as a Surgeon and Climber

Reducing dependence on glasses and contact lenses can simplify expedition routines. Cold fingers, limited washing facilities, and carrying lens-care supplies are practical concerns worth discussing.

Those benefits belong alongside a careful assessment of your eyes and realistic expectations. My aim is to help you choose an approach that supports your everyday vision and your climbing goals, with enough time for recovery and thoughtful preparation.

KEEP LEARNING & KEEP CLIMBING


References

1. Dimmig JW, Tabin G. The ascent of Mount Everest following laser in situ keratomileusis. *Journal of Refractive Surgery.* 2003;19(1):48–51.  

[Read on PubMed](https://pubmed.ncbi.nlm.nih.gov/12553606/)

2. Effect of high-altitude exposure on myopic laser in situ keratomileusis. *Journal of Cataract & Refractive Surgery.* 2001;27(12):1937–1941.  

[Read on PubMed](https://pubmed.ncbi.nlm.nih.gov/11738908/)

3. Paterson R, Drake B, Tabin G, Cushing T. Wilderness Medical Society Clinical Practice Guidelines for Treatment of Eye Injuries and Illnesses in the Wilderness: 2024 Update. *Wilderness & Environmental Medicine.* 2024.  

[Read the guidelines](https://doi.org/10.1177/10806032231223008)

4. U.S. Food and Drug Administration. What should I expect before, during, and after surgery?  

[Read FDA guidance](https://www.fda.gov/medical-devices/lasik/what-should-i-expect-during-and-after-surgery)