In English slang, "four-eyes" is a common, often disparaging or facetious term used to describe a person who wears eyeglasses. The logic behind the term is simple and literal: the two lenses of the glasses are counted as an extra pair of "eyes," bringing the total count to four. The phrase was first recorded in the late 19th century (roughly between 1870 and 1875) and has since become a staple of schoolyard teasing and informal banter. While it was traditionally used as a mild insult to imply that someone was "bookish," "nerdy," or had poor physical vision, its sting has faded significantly in modern culture as eyewear has become a fashionable accessory and even a status symbol. In some contexts, it is now used affectionately or ironically among friends. Interestingly, the term also appears in the natural world; the "Four-eyed Fish" (Anableps) is a genus of fish that has eyes divided into two parts, allowing it to see both above and below the water surface simultaneously. In human slang, however, it remains a purely descriptive—if slightly outdated—way to reference someone’s corrective lenses.