Hi heatmiser,
I feel your pain, I also get bouts of iritis and its nasty, I live in Australia and over here I'm pretty sure an optometrist can't prescribe meds like that, but I'm happy to hear you were able to get some as I know if iritis is left untreated it can cause blindness so at any cost you do need to get pred eye drops asap, my eye specialist also prescribes me anti biotic drops when the iritis occurs. Good luck and hope you feel better soon
Doreen