Have had ocasional flinches for 15 years. Frustrating! Shoot fast(slow down was the advice) Get a release(still flinched) Give up shooting trap(NO)realized that at distance I was seeing double (diplopia). What to do? Finally a possible correction a prism in the left lens(I'm right eye dominant and shoot 2 eyes open). Had another exam and found I could have a prism installed over my tri focals (left eye only) it took less than a minute to adjust to it. Shot Tuesday no more 2 targets coming out in 16 yd. No flinches in the 50 I shot(broke 47) was sloppy on those 3. Having new lenses with a permanent prism in my new progressives. Wish could have found this years ago. I hope this may help others. Bob Gegerson