Sorry, no definitions found.
Sorry, no etymologies found.
Looking through the exhibition checklist for the show (see previous post) at the Corning Museum of Glass, I came across the term "apotropaic", referring to "objects such as amulets and talismans or other symbols intended to 'ward off evil' or 'avert or combat evil.'" [wiki] The term apotrope comes from the Greek meaning "to turn away", and seems to express itself a great deal in eye symbology.
However, what Bonfante says is not groundbreaking because I discovered that the topic of apotrope in Etruscan art was already published in 1977 by the Folklore Society.