Gets more interesting if you are cross dominant. I shoot right handed wit left eye dominant. Decot made me a set of standard bifocal for sporting clays. I use translucent tape on left lense to blur the shotgun bead so all I see is the sharp one on my right eye, and a crisp target. For pistol I keep the same lense on the left and shift to a single vision on the right, focused on front sight. Left lense still still taped (just enough area to mask front sight.) I tried using non prescription gasses. Fine for close targets, but without astigmatism correction, targets were very distorted for longer shots. Decot is very good at setting these up.