Nepal’s high mountains create extraordinary views—and unusually intense ultraviolet (UV) exposure. Snow, ice and pale rock can reflect UV radiation toward the eyes, while elevation increases exposure. The result can be photokeratitis, commonly called snow blindness: a painful sunburn-like injury to the surface of the eye.
Planning a trek and unsure about your prescription eyewear?
Medical note: This guide is educational and cannot diagnose an eye condition. Severe pain, sudden or continuing vision loss, eye injury, confusion, difficulty walking, or breathlessness at rest requires urgent medical help. At altitude, serious neurological or breathing symptoms can indicate altitude illness—not simply an eyewear problem.
Snow blindness is photokeratitis caused by intense UV exposure. It can affect both eyes and symptoms may develop after the exposure rather than immediately. Snow is a major risk because reflected UV can substantially increase the amount reaching the eyes, but trekking over ice, pale rock or open high-altitude terrain can also increase exposure.
The CDC’s guidance on sun exposure in travellers describes snow blindness as an intensely painful corneal injury associated with reflected UV. This is why lens darkness alone is not enough: UV protection must be verified.
Before buying trekking eyewear in Kathmandu: ask the optical team to confirm UV protection, fit and prescription suitability. Send your current prescription on WhatsApp or call Vision Concern.
Possible symptoms include intense eye pain, a gritty or foreign-body sensation, excessive tearing, redness, sensitivity to light and blurred vision. Because several eye conditions can cause similar symptoms, a professional assessment is important when symptoms are severe, persist or affect vision.
Back in Kathmandu with continuing eye pain or blurred vision? Contact Vision Concern for assessment guidance: WhatsApp +977 9841466716 or tap to call. If symptoms are severe or sudden, seek emergency medical care immediately.
| Feature | What to check | Why it matters |
|---|---|---|
| UV protection | Choose eyewear specifically rated for broad UV protection, such as UV400. | Dark tint without verified UV protection can reduce brightness without providing appropriate UV protection. |
| Side coverage | Use close-fitting, wraparound frames or suitable side shields. | Reflected light can enter from above, below and the sides. |
| Prescription accuracy | Confirm distance correction, centration and fit before departure. | Clear vision supports safer movement on uneven terrain. |
| Polarization | Consider it for reflected glare, but verify UV protection separately. | Polarization reduces glare; it is not itself proof of UV protection. |
| Backup pair | Carry a spare in a hard case. | Replacement options may be limited on remote trekking routes. |
Cloud cover does not eliminate UV exposure, so protective eyewear is still important on bright overcast days. Contact lenses—whether clear or UV-blocking—do not replace sunglasses or glacier-style eyewear because they do not protect the eyelids and surrounding areas.
For more help choosing outdoor lenses, read our prescription sunglasses guide for Nepal. Contact-lens wearers should also review Contact Lens Care While Trekking in Nepal.
Need prescription sunglasses or a spare pair before trekking? Availability, lens suitability and completion time depend on your prescription and the selected lens. WhatsApp your prescription or call +977 9841466716 for an individual assessment.
Snow blindness can resemble other urgent problems, including infection, corneal abrasion or foreign-body injury. If you are still on a remote trail, contact your guide, insurer or local emergency service and follow their evacuation advice.
Need an optician after returning to Kathmandu? See our urgent traveller eye-care guide, then message Vision Concern or tap to call.
Vision Concern provides professional eye examinations, prescription eyewear fitting and traveller-focused optical guidance at three Kathmandu locations. The clinic’s published credentials include ISO 9001 certification, membership of the International Opticians Association (UK), ZEISS Vision Expert recognition and the Best Patient Service Award 2018, Ireland.
| Branch | Location | Phone |
|---|---|---|
| Lazimpat | Das Tower, near Shangri-La Hotel | 01-4543117 |
| Boudha-Tushal | Opposite KFC, Boudha | 01-4562303 |
| Makalbari | Pragati Chowk, near Sanopul | 01-5134042 |
Prepare your eyes and eyewear before the trail.
Review current clinic information and independent feedback before choosing a branch:
Not necessarily. Lens darkness does not prove UV protection. Choose eyewear with clearly verified broad UV protection and sufficient coverage around the eyes.
Polarization can reduce reflected glare, but it does not by itself confirm UV protection. Check both the UV rating and the frame’s side coverage.
No. Contact lenses do not protect the eyelids or the whole front of the eye. Wear suitable protective sunglasses or glacier-style eyewear over them.
Seek urgent help for sudden or continuing vision loss, severe pain, eye injury or chemical exposure. At altitude, confusion, poor coordination or breathlessness at rest are emergency warning signs requiring immediate altitude-illness action and medical assistance.
Vision Concern offers:
Yes.
If your frame is in good condition, we can replace only the prescription lenses with options including:
Many international insurance providers may reimburse eye examinations or prescription eyewear depending on the policy. We recommend checking with your insurer before your visit, and we can provide invoices and supporting documentation when required.
