Glasses

Bifocals are the older version where there is a distinct line between the upper distance lens and the lower reading part.
With varifocals the upper part merges into the lower with no obvious line.

Humptydumpty, it is (in my case) right for reading and left for distance. Seems to work well for contact lenses. I told my optometrist about the problem with stairs etc. but she didn't suggest switching. Probably because there is more profit in varifocals, not to mention all the add ons.

I don't quite understand this - is this bifocal glasses lenses?

My glasses are all one lense distance , one near. That was recommended by my optometrist many years ago. I have no trouble at all.

I have heard it’s possible and works well. Good luck