Distortion Free - Optical Quality with Distortion-Free Lenses: The magnification is Uniformly distributed throughout the entire lens. Scratch Resistance Lenses. - Dual Anti-Scratch coating was applied to The lenses for extra protection. Flexible Material - Made with High-Quality ZYL, which makes them extremely lightweight & Very Durable. Spring Temple - Adds comfort while wearing, & Increases Durability. Optical Quality Lens & Frame - Which put them on the top of the list of the Best Value Reading Glasses. Rita, Premium Reading Glasses High End Glass +1.50 To +6 Magnifying Eyeglasses | Square | Red Optical Frames