I started wearing glasses just before I turned 40. Like Murray said "My arms weren't long enough" lol I went from wearing none to bifocals. The first day was a riot kinds sorta. I know where invisibles. According to my Optomogist there is over 1500 different changes from the top to the bottom. I know I love them but have to learn how to use them. I love that fact that they darken down outside so no need for sunglasses.