This single lens has three filters that you can peer through. You can change the monocle's filter by rotating the lens' outer ring. A small arrow along the edge of the frame indicates the monocle's selected filter. As an action, you can mark a stress to look through and activate one of the filters to gain one of several benefits for the next hour: 1. When you peer through this filter, you can read and comprehend any written language that is known to most. 2. While looking through this filter, you can see in the dark far away. 3. When gazing through this filter, you see invisible creatures and objects as if they were visible if they are close.