The spotting scope problem is finally solved! It's simple, more time spent behind the glass equals better odds of success. With spotting scopes, the biggest problem is the non-glassing eye - it's a pain! The Off Eye is a rugged, durable, and comfortable solution to the face muscle and eye fatigue we experience while glassing through a spotter with one eye closed. The Off Eye patch covers your non-glassing eye so you can comfortably leave both eyes open while glassing. The Off Eye is adjustable and universal, so it can be worn over either eye and adjusted to fit over thick headwear in cold weather. Once you try it, you'll never go back to squinting again! 
Product tips: Do not wear the Off Eye too tight, it only needs to slightly snug to be effective