Kantek LCD Monitor Magnifier Filter, Fits 19" Monitors Measured Diagonally (MAG19L) Fully assembled, elegant, lightweight, and patented design; designed for LCD monitors, not suitable for laptops High quality 1.5 x magnification Acrylic Fresnel lens  concentric grooves on the lens allow for magnification from a thinner surface than a convex lens Adjustable magnification minimizes distortion by adjusting magnifier to be slightly closer or farther from the display Product measures 17 5/8 W x 14 H x 7 D inches, covering a visual area of 16 W x 13 1/2 H inches. Please make sure to select the correct size filter for your monitor. Magnification level not suitable for the visually impaired; designed for general office use in a normal ambient light environment. Note: Any intense lighting in the perimeter of the work area will be reflected within the Fresnel grooves and cause a distracting visual. Please note: For proper functionality, please follow enclosed installation instructions. (Installation Manual available in Technical Specifications below)