The swirling snow fell on the soldier's shield,
covering the symbol of Hrothen's Hope.
The swirling snow fell on the dwarf's black beard,
and melted into the darkness.
-opening poem of Hrothen's Curse, a dwarven tale
There is a land where every person wears spectacles. Those without eyeglasses are considered to be the lowest stratum of society, so adventurers without glasses are treated like outcastes. It certainly would explain those heroes wearing sunglasses for no apparent reason...