09/19/2026
The rule for this one is simple: lens is always the correct spelling.
A lens is a curved piece of glass or other transparent material used to focus or change the direction of light. You’ll find lenses in glasses, cameras, microscopes, telescopes, and even your eyes.
So why does lense look so believable? Plenty of English words end in -se, and the plural lenses can make it feel as though there should be an “e” hiding at the end of the singular form. But there isn’t!