I have had really good luck with Smith both goggles and sun glasses.
I go with 2 pairs of goggles - one with a darker flash type lens to use on bright days and another lens just for flat light days. I will switch to the flat light lens in the afternoon particularly in December and January when the sun sets behind Little Whiteface is is very hard to see. I like the browns and orange tints for low light. This is very much a personal preference. Smith does a really good job of fitting their goggles with Smith Helmets
I've always found its not worth it to bother to change lens in goggles. Just buy 2 pairs and they will last longer.
For sun glasses Smith makes really great and easily changable lens which you can order in like 20 different colors and levels of darkness.
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