Lens #10 3.5x.- 10 Diopter 4″ Focal Length.
3.5x 4″ Replacement Glass lens plate For Headband Magnifiers & Fits Optivisor
High Quality Replacement Optical Glass prismatic lens plate with 3.5x magnification and a 4″ focal length or working distance, compare to LP-10 lens plate, fits many Headband Magnifier models including Electro-Optix HVM- models and will also fits Optivisor brand and many other Optivisor “Style”. Makes the perfect replacement lens for one that was lost or broken and as an accessory & Gift for someone that has an optivisor or similar headband magnifier. We also sell a set of 4 lens plates with a 1.5x,2x,2.5x,3.5x see item at the following link https://www.ebay.com/itm/115109022119 MAGNIFICATION FOCAL LENGTH Lens #10 3.5x.- 10 Diopter 4″ Focal Length