They can be depending on your vision issues. Mine are essentially bifocals where the reading portion isn’t visible. If I focus there’s a tiny fuzzy line where the readers meet the normal lens.
To be honest I wasn’t aware of the sides issue and it seems you might have different problem that requires a third lens.
That is an equally large presumption. I happen to agree that some were more interested in control but many were believers.
To them it is. Do you not get that they believe they have the words of their divine being in book form? If their faith is correct it would be proof.