yeah, it sounds like ON. You should go to your ophthalmologist to get it confirmed tho.

If the double vision is really troublesome, you can patch your eye. (the one causing the problem). When I had double vision a few years ago, my eye doctor just put opaque scotch tape over the lenses of my glasses. It worked great. Didn't damage the lenses of my glasses either. I got the hairy eyeball from people when they saw the tape on my glasses, but it kept me from walking into walls and tripping over the double images that were out to make me fall down.