Many ranges today are making ANZI rated safety glasses mandatory. For anyone with old eyes like mine, it becomes a problem if you have to look through the bifocal to see the front sight. Amazon is now carrying bifocal shooting glasses. The bifocal is in the top of the lens as opposed to the bottom of normal glasses. Look for SSP eye ware and then make sure you get the shooting glasses and not just safety glasses. They come in a nice case with 3 colored lenses clear, yellow, and smoke. Simple order the strength you buy over the counter bifocal glasses. Price is about $36 but well worth it.