Vents Empire Vents Lenses Paintball Replacement Lens M3Vents Empire Vents Lenses Paintball Replacement Lens M3 If you are looking for an "M3" lens for a Vents branded goggle (now part of Empire), these are standard Empire Vents Lenses, which fit a wide range of models including the E Flex, E Vent, Avatar, and Helix. Thermal Dual Pane: These are the recommended choice to prevent fogging in high intensity play. Compatibility: These lenses are interchangeable across all goggles using the Vents lens system