Check the listing for details. Aviator Progressive Clear Lens No Line Reading Glasses Tri-Focal Reader Spring. Condition: New with tags. Listed at 15.95 USD. metal frameplastic lensnon-polarizedLens width: 60 millimetersProgressive Tri-Focal Reading Glasses (No visible line) - No more needing to carry multiple pair of glassesLens are divided into 3 sections, 1/3 at the bottom is your selected power, 1/3 in the middle is slightly less than selected power, 1/3 on top is half of your selected power.Package contains 1 Tri-focal Progressive Reading Glasses and 1 microfiber cleaning storage pouch. - 60mm Lens Width, 49mm Lens Height, 143mm Frame Width - Adjustable English nose piece. Spring hinge design.This Multi focus Reading Glasses include 3 strengths within 1 pair of reading glasses, so you can read, view your computer monitor and converse with others, all without having to take off your reading glasses.