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I asked my retired, optometrist wife.
She didn't have time to respond fully because she's dealing with a plumbing hardware supplier to get a defective toilet tank replaced*, but she sent this:
Those are for adults with presbyopia and near vision. The PD is standard for average adults. If we assume people will get the right distance prescription via over-the-counter means, then who is responsible if they buy the wrong thing and get into a car accident because they couldn't see at a distance?
I had to look it up, but "presbyopia and near vision" means you used to be able to see up close, but now you're old and you can't focus up close anymore. As opposed to: you're young, but your eyes are the wrong shape.
PD would be pupillary distance, ie the gap between your two pupils. One of the things they measure when they're ordering lenses for your glasses. As has been explained to me previously, if the PD is wrong, it's adding prism to the lenses, and headaches to your experience.
* She didn't retire to become a plumber. We're getting a powder room renovated, and the tank for the new toilet arrived damaged.