How to exchange the lenses yourself?

Usually a pair of reading glasses can cover 2-3 years, then you need a more harder diopter, usually need to add +0.50, you don't even need to see a doctor, because it is expensive, and you may not be convenient, of course if you go through an ophthalmologist the test results will be more accurate. So once your diopter is not enough, please tell us, we can send you more harder single lenses or finished progressive lenses to y ou , you can change the lenses yourself, or ask a doctor to help you.Flow this video: