Research: Tags here, Wikipedia ("eye injuries", "glasses" - good overview, but nothing really useable) Google ("eye injuries", "eye injuries requiring glasses" - a lot of info on eye safety while wearing glasses).
Question: In short, I need a reason for a character to wear corrective glasses. He is human(oid), but I'd rather avoid congenital causes like near/farsightedness, degeneration or diseases, since they don't occur in his people. Cosmetic reasons are right out as acquired imperfections carry a rather large social stigma in the society he moves in, so even pretending to have them as a fashion statement would be frowned upon.
For plot reasons I'd like an injury or accident that would have him needing glasses (preferably for both eyes), and, since he'll have to explain his problem time and again, an explanation that makes more sense than just a magical mishap.