2 Pairs of Stylish Classic Metal Progressive Computer Reading Glasses - Spring Hinge for Comfortable Fit 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. Select your normal reading magnification power (eg. +1.50 or +2.00), which will be visible through the lowest section of the lens. When looking through the lens, the strength level will decrease as yours eyes move upward. These invisible trifocal readers feature metal spring hinges that offer greater comfort when worn as well as more durability than other readers The outcome: ideal viewing experience for both working at the computer and looking across the room. 55mm Lens Width, 45mm Lens Height, 140mm Frame Width No line and no need to remove your glasses every time you switch between activities such as reading a book and working at your computer. Multi focus Reading Glasses include three strengths within one pair of reading glasses so you can read, type on your computer and socialize with others without having to take off your glasses. The bottom third can be used as your regular reader. this is the power you will buy. the middle third is less strength and can be used on the computer for example. and the top third is the weakest section and can be used for across the room or for distance.