Can reading strength decrease after a lens replacement?

No, the reading return after a lens replacement. The reason you get a reading problem is because your natural eye lens ages and can no longer accommodate properly. The replacement lens does not have to accommodate, because the different strengths in the ReplaceLens Multiple Vision do the work.

What is accommodation?
How well you see up close has everything to do with your eye lens. Your eye lens ensures that you can zoom in and out. The eye lens does this by either becoming very convex or flatter. If you want to see something up close, the accommodation muscle pulls the eye lens into a convex shape. This allows you to see sharply at close range. If the muscle relaxes, your eye lens remains flat and you can focus well in the distance. This focusing from far away to close up is called accommodation.
If this process works perfectly, you will have no complaints when looking up close. Everything you want to see falls exactly on the retina.

Presbyopia (age-related farsightedness)
As the lens becomes stiffer, it becomes more difficult to make the lens more convex, it takes longer to go from flat to convex and back again. In addition, the lens can become less convex.
This makes it increasingly difficult to see at shorter distances and it can take longer for the image to become clear. This can also be very tiring for your eyes. Where you used to be able to easily read a book or the menu in a restaurant, you now have to hold it further and further away from you. To the point where your arms also become too short and it is time for reading glasses or reading glasses correction.