"...and thus it was said that Adaleer the Blest could reflect the true nature of any soul. Now some of his followers believed that his ranger gear, as much a part of him as his faith, was also so blest."
- Dauneth, Lore Chronicles
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...