Had my right eye done (IOL inserted) because it needed doing. Not the result I expected I am afraid. My vision was over corrected with the result that my right eye focuses past infinity. As you know there is not a lot further away than infinity!
One reason you you might want to get an IOL in an eye which does not have cataracts is to balance your eyes. It is quite a challenge to have +0.75 in one eye and -3.50 in the other. Contact lenses are fine but using glasses leads to a lot of double vision.