X-Pro1 viewfinder correction lens

I found several posts on this topic but am still confused. I'm short-sighted but in recent years have developed problems with close-up vision as well. I normally shoot wearing my distance glasses (-1.5 dioptres). Should I choose a correction lens that will cancel the correction of my glasses, i.e. +1.5, or should I go by the dioptre value of my reading glasses? And then there's the complication that the X-Pro1's default is -1 dioptre.

As I said, confused. Any advice would be greatly...

X-Pro1 viewfinder correction lens