Check out Ray-Ban. They have a nice wrap around pair that is good to block the sun from the sides of your eyes. If your prescription is not too bad you can even get them in bifocal with dark lenses. I’ve had mine for over a year and they are great. They are a graduated lense with the middle set for viewing my computer screen. They were about $250. Really keeps the sun out. The blowing volcanic dust can also be a problem and can scratch the lenses down in Mcmurdo. A good Croakie neck/glass strap will cut down on your chances of dropping them too.
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