Due to my nearsightedness, I found it was hard to see the X-ring of a B27 target at 15-yard clearly without my prescription glasses. If I use my prescription glasses, I can see the X-ring OK, but my front sights is now blurring. I friend of mine suggested to get the prescription for one of my eye for front sight and the other for distance. It seemed kind of weird that do you open both eyes while aiming or do one alternating closing one eye than the other? Anyone else has this problem?