The EYESHIELD from Field Optics Research is designed to attach to spotting scopes and monoculars with eyecup diameters for around 37-42mm.
The EYESHIELD is a flexible molded rubber material that connects to the eye piece of the spotting scope or monocular. The EYESHIELD cradles your eye and prevents ambient light from entering into the space between your eye and the spotting scope or monocular eyepiece that causes lens glare. An added benefit is the EYESHIELD protects the eyes from wind, rain, snow and dust. This is a must have for everyone who uses spotting scopes and monoculars.