I have worn bifocals for about 8 years. my first pair did take a little getting used to. The pair I got a couple of years ago drove me crazy. Headaches etc. They finally figured out that the line on one of the bifocals was a tiny bit off and remade one of the lenses. Now they are fine. Good luck. If they continue to bother you take them back, sometimes you have to go over and over and over.