A lens retaining structure for a secondary glasses assembly having a frame configured to be mounted on a pair of primary glasses. The lens retaining structure comprises an inner portion and an outer portion, each comprising a flexible, resilient member having a predetermined rest position. The inner portion has an inner lens grabber thereon and the outer portion has an outer lens grabber thereon. The inner and outer lens grabbers are configured to engage corresponding features of a lens. The inner and outer lens grabbers separated by a first distance when the inner and outer portions are in their rest positions, such that the lens retaining structure is operable to retain one of a plurality of lenses of differing sizes and shapes having corresponding features separated by a second distance which is different from the first distance.