Eye Health on the Trail — Contacts, Dust & UV
Dry mountain air, dusty trails, intense UV at altitude, and thin oxygen all stress your eyes — especially if you wear contacts. Add wind, cold, and wood-smoke from teahouse stoves, and eye irritation is one of the most common complaints we treat on trekkers.
Common Trail Eye Problems
- Dry eye: low humidity + cold air = irritated, gritty feeling eyes. Artificial tears help; contacts make it worse.
- Conjunctivitis: dusty trails + touching your face = bacterial or viral eye infection. Red, watery, sometimes crusty — contagious; wash hands constantly.
- Snow blindness (Photokeratitis): UV burns the cornea — pain, tearing, "sand in eyes" 6–12h after exposure. Prevented by Category 4 glacier glasses, not regular sunglasses.
- Corneal abrasion: branch or trail debris scratches the cornea — painful, light-sensitive. Needs antibiotic drops and possibly a patch.
- Altitude retinopathy: rare — retinal hemorrhage at extreme altitude. Warning signs: vision changes, floaters, or partial blindness — descend immediately.
Contact Lens Wearers — Special Rules
- Daily disposables are best for treks — no cleaning solutions, no case to keep sterile, no contamination risk
- Bring 150% of expected need — you'll lose some, tear some, and some will dry out
- Carry backup glasses — if eyes get irritated or infected, glasses are the fallback
- Never wear contacts on high-altitude days — reduced oxygen + dry air + long days = extreme irritation. Wear glasses on summit days and high passes.
- Lubricating drops — contact-safe rewetting drops help, but they're a workaround, not a solution
When to See a Doctor
- Eye pain + light sensitivity (not just irritation) — could be corneal ulcer
- Pus/discharge + redness spreading — bacterial conjunctivitis needing antibiotic drops
- Vision changes — floaters, flashes, or partial field loss — URGENT, descend and see a doctor
- Snow blindness symptoms that don't resolve in 24–48h
- Foreign body that won't flush out with clean water
Eye Care at Our Clinic
We treat conjunctivitis, corneal abrasions, and snow blindness — antibiotic drops, steroid drops, lubricants, and eye patches. For specialist ophthalmology (cataracts, retinal issues), we refer to Tilganga Institute of Ophthalmology in Kathmandu.
Prevention — The Eye Care Routine That Works
- Category 4 glacier glasses above snowline — not fashion sunglasses; the UV intensity at altitude will burn unprotected corneas in under an hour
- Artificial tears twice daily — proactively, not when eyes already hurt; dry eye compounds with each day
- Glasses on summit days and high passes — the days with the worst exposure are when contacts come out
- Hand hygiene as eye hygiene — most trail conjunctivitis comes from face-touching; the soap rule applies to your eyes too
- Clean lens case nightly — if you are wearing contacts at all on trek, the case itself becomes a contamination source
What the Clinic Stock for Eyes
- Antibiotic drops — for bacterial conjunctivitis and corneal abrasion prophylaxis
- Steroid drops — for inflammatory conditions where indicated, under clinician supervision only
- Lubricating drops and ointment — preservative-free artificial tears and overnight gel for dry eye
- Eye patches and shields — for patching corneal injuries and post-snow-blindness protection
- Foreign body removal — irrigation, magnification, and instruments to remove embedded debris safely
- Direct referral to Tilganga Institute of Ophthalmology — for retinal issues, vision loss, or anything needing a specialist
Common Questions
The Altitude Eye
Eyes at altitude face: dry air (contact lens discomfort, dry eye), intense UV (snow blindness risk, cataract acceleration with chronic exposure), wind and dust (irritation), and the contact lens hygiene challenges. The eye health at altitude is about protection and the awareness that the environment stresses them more than sea level.
Contact Lens Management
Contact lens wearers: the dry air makes lenses less comfortable; the hygiene facilities on trek are limited (hand washing before lens handling is harder); the UV protection that sunglasses provide is essential over lenses. Consider daily disposables for the trek (no storage/cleaning needed) or glasses for the challenging hygiene environment.
The UV Exposure at Altitude
UV intensity increases with altitude — the atmosphere filters less at elevation. The eyes accumulate UV damage (cataracts, the retinal damage) faster with the unprotected altitude exposure. The UV-protection sunglasses are the eye protection that the altitude environment requires; the eyes that are unprotected at altitude accumulate the damage faster.
The Dry Eye Factor
The dry altitude air plus the wind produces the dry eye — the grittiness, the redness, the discomfort. The artificial tears (the lubricating drops) relieve it; the contact lenses are harder to wear in the dry environment. For the eye health on trek, the sunglasses plus the dry eye management are the combination.
The Dry Eye at Altitude
Altitude's dry air dehydrates the eyes — the contact lens wearers feel it more (the lens dries, the discomfort). The lubricating eye drops (the artificial tears) provide the relief; the contact lens break (the glasses days) when the dryness is significant.
The UV Protection
UV damage to the eyes — the cumulative exposure produces the pterygium (the growth on the conjunctiva), the cataract acceleration, and the retinal damage. For the altitude trekker, the UV protection is the long-term eye health maintenance.
The Contact Lens Care
Contact lens hygiene in Nepal — the solution availability (the brands that may differ), the water quality concern (the solution that must be the sterile water, not the tap), and the case hygiene. For the contact lens wearer, the supplies that are brought or the local availability that is verified.
The Foreign Body
The dust and the debris in Kathmandu — the particles that enter the eye. For the eye with the foreign body, the irrigation (the clean water flush) and the evaluation if the object is embedded.
The Dry Eye
Altitude dry eye — the low humidity plus the wind that dries the ocular surface. For the contact wearer or the dry-eye-prone, the lubricating drops that are carried.
The UV Exposure
Eye UV exposure — the cataract risk that accumulates with the lifetime UV. For the trek that exposes the eyes to the intense UV, the sunglasses that protect.
The UV Exposure
Eye UV exposure — the lifetime accumulation that contributes to the cataract and the pterygium. For the trek's intense UV, the sunglasses that protect.
The Dry Eye
Altitude dry eye — the low humidity that produces the ocular dryness. For the contact wearer or the dry-eye-prone, the lubricating drops that are carried.
The UV
Eye UV protection — the sunglasses (the 100% UV that is essential), the snow blindness that is prevented, and the cataract that is reduced.
The Dry Eye
Altitude dry eye — the low humidity that produces (the tear that evaporates). For the dry eye, the artificial tear that is used.
The Eye Care Cost
Eye consultation cost — the ~$10-30 (the affordable that is available). For the eye issue, the accessible that is priced.
The Drops
Eye drop cost — the artificial tear ~$3-10, the antibiotic drop ~$2-8 (the cheap that is stocked). For the dry eye or the infection, the affordable.
The Consult
Eye consult — the ~$40 (the assessed that directs). For the foreign-body/red-eye, the evaluated that is the route.
The Drops
Eye drops — the ~$3-10 (the antibiotic/lubricant that is the common). For the irritated, the applied that is the fix.
Can I wear contact lenses on a high-altitude trek?
Daily disposables are workable on lower sections; above 4,000m most lens wearers switch to glasses — oxygen supply to the cornea drops, the air is dry and cold, and lens hygiene is nearly impossible in teahouse conditions. Bring 150% of expected lens supply and a backup pair of glasses as the default, not the exception.
Is snow blindness actually permanent?
No — photokeratitis is a corneal sunburn that heals in 24–48 hours with patching and lubricating drops. But it is debilitating while it lasts: pain, tearing, and "sand in the eyes" sensation that makes walking unsafe. It is entirely preventable with Category 4 glacier glasses; regular sunglasses are not enough above snowline.
How do I treat conjunctivitis on the trail?
Keep hands off the eye, flush with clean water, discard any contact lenses, and do not share towels. Viral conjunctivitis clears on its own in days; bacterial (thick yellow-green discharge, crusted shut in the morning) needs antibiotic drops — we dispense them same-day. Both types are contagious; wash hands constantly.
What does altitude retinopathy feel like?
It often has no symptoms until bleeding is significant — which is why vision checks matter above 5,000m. Warning signs: new floaters, blurred vision, a shadow or blind spot in your field, or sudden vision loss. Any of these means immediate descent; retinal hemorrhage at altitude does not wait.
My eye has a foreign body that will not rinse out — what do I do?
Do not rub it — rubbing scratches the cornea further. Flush with clean water or saline repeatedly; if it will not come out, do not pick at it. Come in — we have the tools to remove embedded foreign bodies safely and can check for the corneal abrasion it usually leaves behind.
