It's been a hot minute since I was last able to plink at the range with my AR (Nov ???). It's also been at least 2 years since my last eye appointment or new Rx. I was having a heck of a time with seeing the target clearly in prone (target at ~25 yds). I kept seeing a "picture in picture" effect of the target through the scope. I played around with length of pull/eye relief, cheek riser height, turkey neck, etc. It wasn't nearly as bad when in seated or standing. Any ideas of how to make it better with both eyes open? I'd like to get a handle on this before a training event later this month.