Progressive multifocus glasses for all your need. The bottom part of the lens is full-power magnification, then used for nearly distance reading. The middle part is slightly reduced power ...

He notes that using the wrong reading glasses can cause headaches, eye strain, and nausea. That’s why it’s important to ...

The bottom is the normal power you choose for reading/writing ... any questions with the glasses, please don't hesitate to contact the seller, we will try our best to solve them.