Custom shooting glasses are available in Rx and non Rx models for shooting rifles , pistols, shotguns, and bows. These glasses are made with special bifocal segments located along the top rim or near the nose bridge for convenient sighting for those who require near sight correction to obtain a more focused front sight or scope image. The small bifocal seg does not obstruct normal distance viewing. Check these out at
http://www.hansenseagleeye.com Also available are special lenses equipped with the shooter's bifocal for the ESS ICE 2.4 Interchangeable Component Eyeshields Rx Carrier. This provides the ultimate in shooting glasses eye protection and versatility with the polycarbonate shields backed by a Rx insert equipped with the bifocal segment.