How is presbyopia correction performed?

I'm still okay because I don't have presbyopia yet.

My husband's presbyopia seems quite severe, so last time...

I went to the optical shop and bought a magnifying glass.

They say it looks good even with that.

I read here that they also do presbyopia correction.

Of course, you should go to an ophthalmologist for a consultation to know the details.

Could you roughly explain how presbyopia correction is performed?

Is it a procedure or surgical treatment?

And is it over after doing it once?

Or do I have to do it again later...

I'm curious because I have no information at all.