Just a suggestion because I know nothing of your eye issue. I suspect you are not the only one having an eye issue when shooting a weapon. You may consider contacting the NRA and see if they can recommend an eye specialist or Optometrist who specializes in issue confronting shooters. Contact that guys (or gal) and see what they suggest.
I know after about an hour of shooting at the range, I develope "eye-bounced" and focusing issues. I think it's an age thing we me. It comes and goes but sometimes the target starts to look like theres a fuzzy wreath around it and the once stationary starts moving around in little circles. I've learned to look away and focus on things first closer, then medium and then far away and the bounce stops. So I can only imagine what you are going through in the pain. Good luck and hope you find a solution.
