Had reading glasses for a few years now for reading maps and stuff. Noticed however that instruments where getting blurry as well, especially at night. Found myself flying with reading glasses on the tip of my nose.
Decided on varifocals about 4 weeks ago and pretty happy with them. Takes a while to get used to them but love them now.
Tips if you decide on varifocals, don't go cheap! I took the varilux S2 which apparently are about the best out there.
Have the glasses large enough! My ego got the best of me and I bought these small rimless glasses, I also put them in my ray ban wayfarers, which are large and found that the wayfarers are actually even better.
Go to a good optician and explain what you need!
Good luck!