Brand: Carson Optical. MPN: VM-10. The VisorMag from Carson is a set of clip-on flip-up magnifying glasses that attach to the brim of most caps and hats. Perfect for fly-tying arts crafts hobbies and all hands free needs. Complete with protective soft-pouch its crystal clear acrylic lenses give you a sharp distortion-free view that allows you to see even the finest details with ease. Keep these clip-on Magnifying lenses in your tackle box so you will always have them ready. The VisorMag magnifying lenses are available in 3 different magnifications. The VM-10 model has a 1.75x magnification which is equivalent ot +3.00 diopters. The VM-12 version has a 2x power magnification which is equivalent to +4.00 diopters. The VM-14 version is the most powerful version at 2.25x magnification which equates to +5.00 diopters. The VisorMags are backed by Carson s Limited Lifetime Warranty.