Your surgeon and/or his nurse will help you.
For me, it was pretty much selected for me. After many tests and a long and thorough examination by the surgeon, his nurse sat down with me and said there were two choices that I had - - regular lenses (the cheap ones), or multifocals. I immediately rejected the multifocals because multifocal glasses were a nightmare for me and I never could adjust to them. YMMV
Since I have always been told that my astigmatism was pretty severe, and worse than my nearsightedness, I asked about the toric lenses. The following exchange took place:
Nurse: "well, but toric lenses are several thousand dollars more expensive!"
W2R: "I don't care, I just want to see well and I have always had considerable astigmatism".
Nurse: "you will see better with the regular lenses because your particular astigmatism isn't caused by the shape of your cornea; in your case, it is due to distortion in the lenses in your eyes, themselves. They will be replaced during the surgery so that will correct your astigmatism."
So, I went with regular (cheap) lenses. There was one more choice: did I want to be far sighted in both eyes, or did I want monovision - - near sighted in one and far sighted in the other.
Since I had never tried monovision with contacts I didn't know if I could adjust to it. I had been perfectly happy with contacts and readers, though, so I knew I wouldn't mind readers after the surgery. Therefore I chose both eyes to be far sighted.
As for my adjustment after surgery, for each it took a few days before things settled down and I could see well. By the one week appointment I could see better than ever before in my life. Even when I was five years old I could not see this well. I can drive with no glasses at all, and just use readers up close. I occasionally use a magnifying lens for extra-fine work up close but not often. The colors are brilliant and beautiful now.
I do have a problem with double vision, in each eye, separately. Double vision is apparently a very rare to non-existent problem with cataract surgery, and in my case it seems to be going away.It is only a problem sometimes late at night when my eyes are tired. I told my surgeon that it wasn't a big deal (because I don't want him to start thinking of another surgery, no way!). He said he really didn't know the reason but since I seemed satisfied with my vision for the most part, I think we'll probably do nothing for now. It seems like it is getting a little better with time. For example, right now I am not having any double vision problems and it's 10 PM.