suggestion for bifocal wearers and shooting.. I have asthigmatism and have been wearing bifocals for about 20 years, and have been competitive shooting for a little over 27...I've tried to have several optical firms make a pair of polycarbonate lenses,with no success... polycarbonate wrap arounds with prescription inserts, no luck...tried moving the near prescription to the top of the lens (tilt head down slightly to shoot) no luck... what worked was to have a single vision lens of my near prescription for my dominant eye, and move the bifocal line up a couple of millimeters in my non dominant eye. Depth perception is off for about 1/2 hour, but your brain compensates...my shooting box is next to the 72hr bag in the car, and I have 2pairs of shooting glasses...my optician is a shooter friend, and the optometrist he works with has me bring my pistol or carbine into the office...