1) I am 80 and have very little accomodation. That is, accomodation, as opposed to reaction to light, allows you to focus at shorter distances. Normally, one starts to lose accomodation at about age 45. That's why older people wear reading glasses (+ diopter). I keep 3 or four pairs of "reading" glasses: +2 for ordinary reading; +1.50 for computer monitor that is further away; and +2.5 to +3.0 for welding. Thankfully, they are cheap, and I have multiple pairs.
2) I would distinguish "farsightedness" in young people from the effects of accommodation that older folks experience.
3) "Nearsighted" people (those needing negative diopters when young) are more sensitive to the correction. In the US, one can buy "reading glasses" at many stores. Glasses to correct nearsightedness require a prescription.
4) If your eyesight was effectively normal, a 2X visor will work fine. If you need closer work, wear reading glasses underneath. The problem with microscope oculars (eyepieces) is that they do not move with you. Even WF (widefield) large (e.g., 22mm) can be annoying to work with . The headvisor follows your head wherever you look. As an aside, I sometimes have to peek under it to get my soldering iron into its holder. But, I can pretty much do that by feel most of the time.
5) Another problem with a microscope is that it requires your head to be quite a bit higher from the PCB you are soldering than a headvisor requires.* That results in your arms being lower. Jewelers' benches are usually quite high, because your control is better with your arms slightly raised on a bench.
6) I do use my dissection microscope for photographs.
7) Getting old is not for sissies.
*EDIT: I am referring to relatively inexpensive ones on Amscope, etc. Very expensive ones can have the oculars at almost any height for the user, e.g., ones used in surgery.