Square Aviator Polarized Bifocal Sunglasses for Men. Nearly Invisible Line Readers Composite frame composite lens polarized Lens width: 65 millimeters Lens height: 44 millimeters Bridge: 23 millimeters Arm: 122 millimeters GLARE-CUTTING POLARIZED LENSES  For absolute clarity, always choose polarized lenses. Polarized bifocal readers eliminate glare from shiny objects such as chrome bumpers, car hoods, mirrors, & water. Polarized lens also provides maximum UV protection. Polarized bifocal sunglasses are great for outdoor activities including fishing, biking, cycling driving, hiking, walking or reading at beach. OPTICALLY CORRECT READING LENS  Optically corrected lenses provide accurate reading powers with no distortion. So, if you look at a straight line, the line will be straight. Lenses provide 100% UV protection and also scratch resistant. Available in the following powers: +1.50, +2.00, +2.50 or +3.00. HIGH QUALITY FRAME: For added durability and pliability, these sunglass frames are constructed of Nickel Silver. Nickel Silver is more rigid and possesses an attractive shine. FLEXIBLE SPRING HINGES: Tired of sunglasses that pinch your temples or get bent out of shape and fall of your head? These sunglasses feature a flexible spring hinge that flexes to fit your head and springs back to its original size. NEAR INVISIBLE BIFOCAL LINE: Everyone will need to wear bifocals at one point in their lives. But does the whole world need to notice those unsightly bifocal lines? The magnified reading area at the bottom of the lens is injection molded, which means you cant feel the bifocal line on the lenses. The front of the lens is smooth, like nothing is there. Its nearly invisible. Its visible from the back of the lens, however, but not so much on the front of the lens.