The Field Optics Research's Standard Binocular EyeShields are the universal binocular accessory that connects to the eye piece of your mid and full-sized binocular optics. The EyeShields are designed to block peripheral light and distractions, reduces lens glare, and protect your eyes from the elements while allowing you to achieve improved clarity and focus. These Standard Binocular EyeShields are optimized to fit most Nikon, Zeiss, Nikon, Bushnell, Leica, Vortex, Vixen and Swarovski mid and full-sized binoculars and any other binocular with eyecups with outer diameters 1.45” - 2.15”.