If it pulling them away to get Clear focus u need to do the following
Add ur distance prescription to ur reading prescription then take 1 diaopter away and that should work.
Prescription s look like this
Distance +2.00 -0.25 x 100
Reading add + 2.00
= Reading prescription of +4.00 -0.25 x 100
So a pair of of the shelves +3.00 should work for above prescription as it will give a slightly longer range of focus.
Thanks, I'll give that a try.