Hello Donna,

bifocals are a line across your lower centre vision. This opto you used could be grinding way too high to start with.

The problem you have is the reason I don't have bifocals. They caused me all sorts of problems and I was triggered into vertigo. They just weren't worth it for me. I have 2 pairs of specs but that is better than tripping over every step and getting vertigo.

I really hope your new glasses work better for you. I don't see why they couldn't grind the lenses lower down, it makes good sense to me.