first off, let me state that I've been using the same prescription now for at least 30 years. I take my old glasses in to the eyeglass store, and tell them I want that prescription again. and they do it. they try to get me to take an eye exam, but I always politely refuse, and tell them I can see really good with the glasses I have now- and don't want to change it. if you keep the prescription on your glasses the same, your eyes won't get worse !! that is the dirty little secret that the optometrist doesn't tell you. the next one is this- when you read and do close work, and you are nearsighted- TAKE YOUR GLASSES OFF. making your eyes adjust to read with glasses on designed to see far, is really torturing your eye muscles- and that's why nearsighted eyes keep getting worse with time. if you stick at one prescription it will just stay there. yes they can read the prescription off the glasses with a machine. and I know for a fact, about 20 years ago, an optometrist read my prescription from the edge of the lenses themselves. I guess some places would actually mark the lens with tiny numbers of the actual prescription. only spend the money and time for an eye examination, when you actually are having problems with vision, or pain, etc. if your vision was normal would you get it checked every year ? if you can see clearly and read road signs, etc. while driving, then you're seeing just fine. people spend billions/yearly on eye exams they don't need.
