Science Fair Project Encyclopedia
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
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details