The lenses in compound eyes of butterflies and moths contain an array of nipple-shaped protuberances. or corneal nipples. Previous work has suggested that these nipples increase light transmittance and reduce the eye glare of moths that are inactive during the day. This work builds on but goes further than earlier analyses suggesting a functional role for these structures including. https://www.chiggate.com/3m-speedglas-9002nc-welding-helmet-fashion/