libra is also associated with the planet venus (which itself is named after the roman goddess - associated with the sea, love, and beauty), and also, wikipedia has this to say about libra's scales:
"The symbol of the scales is based on the Scales of Justice held by Themis, the Greek personification of divine law and custom. She became the inspiration for modern depictions of Lady Justice."
so, if we're not to look too deep (yet), there could be a very literal reference to scales, or the concept of justice - keeping in mind the phrase "justice is blind." there's a number of justice-affiliated characters who are blind, often wearing glasses or blindfolds - could we see something similar here?