The job of a loupe (= magnifying glass) is to magnify an object.
The job of reading glasses is to "bring the near into focus.

From the TV commercials, it appears that they are trying to do with loupes what should be done with reading glasses. Doing so actually exposes the biggest weakness of the Hazuki loupe, which is its inability to focus on the subject. It could be rephrased as making it easier to see by magnifying the image even though it is not in focus.

If you are nearsighted, astigmatic, farsighted, or presbyopic and do not need glasses, you will be able to focus, but if not, you will unfortunately rarely be able to focus at the distance you want to see.

We sell Hazuki loupes at our store, but many people come to our store with too many illusions, and when we explain the principle of the loupes to them after they experience them, many of them leave disappointed.

The proper use is to see things larger, to magnify fine print, or to thread a needle for handicrafts. For this purpose, a single unit can be shared by the whole family, including children.

Finally, how does it work for people who are nearsighted, astigmatic, or farsighted?
Wear the Hazuki loupe over your regular glasses (including bifocals and reading glasses). This way, you can see the object in focus and magnify it.

Tools" are made for different purposes, so they cannot be perfect for everyone. It is better to try them on in a store before buying them by mail order. Moreover, wearing Hazuki loupes does not at all mean that reading glasses or bifocals are no longer necessary.