Obviously, you get what you pay for but in this case I paid $20 for both at a pawn shop. The Nikon on the left is a much better noc than the Tasco on the right...but.
The Tasco seemed to view fine until recently where I'm seeing double. I've individually focused the sides to each eye properly. Everything is in focus, but I'm seeing dual focused images.
I pick up the Nikon's to see if it's my eye's and the view is perfect through them. I'm wondering if maybe the Tasco's barrels were knocked out of alignment?