Listen to the Doc! I have custom orthotics and they work real well and cured my problems.-DickAs a doctor who mostly treats above the feet and a runner for 50+ years (27 marathons, 4 Bostons) I've used orthotics for as long as I can remember. If you really need an orthotic you should invest in a couple of pairs of professionally fitted custom inserts. You won't do lasting damage to your eyes by using glasses fitted to someone else. The same isn't true of your feet.
You ought to save a bit by getting two pairs at once, they will last twice as long and switching one pair from running to tennis to dress shoes all the time is a pain.