I'm not sure. My glasses need cleaning, and I seem to have catatonic symptoms where I'll sit in one place, with my head not moving for very long periods of time, like an hour or so. Then, when I start moving my head, I feel dizzy and like I'm going to fall down. It was really bad coming back from the dining room earlier. Not even my walker was helping and I felt a terrible panic attack coming on. I had to use one hand on the walker and one hand on the wall.