This is a quality of life thing, if you want to have better vision, no point in worrying about bad outcomes that you can not control. Bad outcomes are unlikely, this isn't open heart surgery. Best advice I can give is make sure your surgeon has done multiple PRKs recently so he's not too rusty.
Give yourself 5-7 days at least, everyone's eyes heal differently. Get numbing drops/ointment from the Dr.
You may have to adjust to light sensitivity and such but our brains are pretty good at adapting and you will get used to it. Looking at screens isn't an issue I've heard of but you can always manipulate your brightness and warm to accommodate yourself.
I would advise PRK > LASIK because in the future getting the correct refraction for your cataract surgery (in your 65-80s) could be more difficult.
Depending on your prescription, this could drastically improve the next ~30 years of your life until cataract surgery.
For artificial tears / lubricating drops I'd recommend getting Optase. I've tried the market and like them the most. From the EU I believe but they are everywhere now. They're on amazon.
Good luck.