Google Glass-inspired bicycling accessory gives your sunglasses a nifty rear-view mirror!
https://www.kickstarter.com/projects/corky-x/corky-x-eyeglass-fitted-bicycle-rear-view-mirror It preserves your aerodynamics while giving you an easy-access rear-view mirror… and it fits right on your spectacles/sunglasses like a rather futuristic, life-saving accessory….