Wearing no lines for better then 20 years I have learned first do not get thin lenses top to bottom tightens up the area of correct vision to much. Second is not to buy the cheaper lenses the correction area left to right is to small and causes you to turn your head every time to look at something to the side. With my current lenses I can turn my eyes from frame edge to frame edge and see just fine. My eyes are really bad only correctable to 20-40.
THE very worst thing about bifocals is when trying to read a label on the top shelf at the store. For some reason when the head goes back far enough to read thru the bottom parts of the lenses the mouth comes open. I get very frustrated working on vehicles trying to see thru the lower bifocal and there is not enough room, I finally wen to a pair of cheaters.
