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Snow blindness

Snow blindness is a painful condition caused by exposure of unprotected eyes to sunlight reflected from snow. This is especially a problem at high altitude and polar regions.

The problem is also related to the condition arc eye sometimes experienced by welders.

Some guidelines to use when choosing a good trekking/mountaineering pair of sunglasses:

  • 99-100% UV absorption
  • Polycarbonate or CR-39 lens (lighter, more comfortable than glass)
  • 5-10% visible light transmittance
  • Large lenses that fit close to the face
  • Wraparound or side-shielded to prevent incidental light exposure

See also

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