Potbellied Kobold's Guide to Magnificent Magic: Eye Lenses of Wonder

From publisher blurb: Potbellied Kobold has many wondrous items. These magical eye lenses are just a sample of what she has to trade or offer as reward. These magical, thin, circular pieces of stained-glass fit over a Large-sized or smaller creature’s eye. The lenses remain in place until removed. A wearer gains a magical trait while wearing one lens, and an additional major trait while wearing matching lenses. If you wear two different lenses, you gain both lessor traits but no major trait.