Flange designed to be installed on glass Ocular Autoclavable Three Mirror Lens (OG3MAC-10) and Ocular High Definition Three Mirror Lens (OG3MHD-10). Flange made of durable medical polymer, will not break during normal handling and use. Eliminates the need to purchase additional lenses with dedicated flanges. Flange cover is easily removed from the Autoclavable glass lens for cleaning and sterilization. Compatible with most common disinfection and sterilization methods including steam sterilization.