I've worn glasses for more than 30 years now and worn varifocals for at least 20 years. I had my eyes tested and new glasses last December, all was fine until a few weeks ago when I started to struggle finding the "sweet spot" and then I discovered that it was clearer watching the television without my glasses than it was with them. I had another eye test about a month ago and it revealed that I now need no correction for my distance vision. Has anyone else had this happen and why does it happen?

Eddie