I just had cataract surgery on both eyes and have to wait over a month to get an eye exam. My prescription glasses were too strong, but I still needed reading glasses, I got these the day after my second surgery, and they are great! They are invisible on my face, very comfortable, and perfect for reading and watching TV without having to take them on and off. I had a slight headache the first day, it takes time for your eyes to adjust to progressive lenses, but now I am wearing them all day and forget I even have them on. I may not need to get prescription glasses, I'll just keep these!