improves your vision on the mountain - lookout goggle. zeal optics has combined its patented rail lock system (//rls) and award-winning observation deck technology (odt) in the revolutionary lookout goggle to enhance your vision on the mountain. the odt is the first eyewear system to replicate an eagle's view of the mountain. the odt frame expands the vertical field of view by 20 % with its pantoscopic tilt and low profile, so you can see every inch of the track below you.the rls is the ultimate technology for changing lenses. with the vertical rail lock system, changing lenses on the move is child's play and allows the lenses to be vented when hiking or on wet days.