HoodEYE eyecups link your eye to the camera by comfortably sealing out ambient light. HoodEYEs help reduce eye fatigue. You can easily upgrade your camera eyepiece in just a few seconds. The self-locking mount keeps HoodEYE on your camera. Regular and Glasses HoodEYE eyecups rotate to accommodate right or left eyed shooters. All Eyecups are made of hypoallergenic silicon rubber for comfort.