HVM-4 1.5x Our HVM-4 Premium Binocular Headband Magnifier Visor with 1.5x and long comfortable 20" Focal Length, this magnifier is best suited for tasks that require minimal magnification and a longer working distance. headband is fully adjustable to fit any size quickly and easily. Headband is also adjustable +/- 60 degrees either way making it easy to flip up and out of the way of the line of sight. The HVM-4 premium features an aluminum alloy headband pivot mechanism as well as scratch resistant glass prismatic lenses, lightweight durable impact resistant visor shell suitable for the industrial environments. The 1.5x glass prismatic lens gives you an versatile & longer comfortable working distance of 20" for most repetitive applications and hands free magnified view. Can be worn over eyeglasses and many safety glasses. Other lens magnifications available for purchase for the HVM-3 and HVM-4. Our standard size lenses will also fit many other headband magnifiers including OptiVISOR® Brand. If you currently have a Donegan Optivisor all of your lenses and accessories will fit this model.