I once had a pair of clip on auxilliary lenses that I wore over my regular prescription glasses that allowed me to see the rifle sights clearly. Later, I handed the prescription glasses with the aux lenses clipped on to an optometrist and he made me a set of lenses optically equivalent to the regular/aux combo and mounted them in a set of wire frames that looked as old-timey as we could find. Worked great for several years until my vision shifted with age.
As you age, you tend to become more far-sighted, so over the last few decades I've gone from being very nearsighted to slightly farsighted. The last two years, I've shot rifle and pistol without any corrective lenses. I very recently experimented on pistol shooting with wearing a set of off-the-rack reading glasses (0.75 diopter which should have a focal length of 1.33 meters or about 4 feet). I get a really sharp sight picture, although the bullseye at both 25 and 50 yds is a bit fuzzy.
Weaker reading or computer screen glasses, 0.25 and 0.50 diopter, are available online around $25. I'm wondering if a set of those would make for a better rifle sight picture.
Bottom line, if you tell your optometrist or eye doctor that you're a shooter, how far the front and rear sights are in front of your eye when you sight, and at what distances the target is, he may be able to make you up a prescription or suggest an off-the-rack reading glass solution. If he can, then you don't have to bother with aperture disks, tape, or dog soldiers enforcing questionable sighting aids rules.
