This happens very often when they prescribe glasses for reading and a person starts to look in them regularly into the distance, these glasses turn into glasses for distance and, accordingly, they are needed more for reading, in glasses that look stronger again into the distance and they turn into glasses for the distance, but close up are needed even more and so on the knurled.
I don’t know how it is now, but thirty years ago there were such methods when they tried to correct minor myopia by prescribing plus points. I was treated like that in childhood - it didn't really help. Perhaps your friend is the same.
It means that he incorrectly names his diagnosis. With myopia, plus glasses are completely useless. He is most likely to have farsightedness (hyperopia).