If you have a copy of your prescription which is not out of date or you know the number of your eyes , you can get them online . there should be a form for you to fill in the number so that they can make the lenses you need . I know eye exams do cost an arm and a leg .It is better to have vision insurance which can save you a lot .
If you don't see an eye doctor and get a prescription, then the glasses you get may not fit properly and may not work well. They could even damage your eyes. Even if you aren't having any problems now, the lenses still could be causing damage to your eyes. By having regular check ups and buying glasses with a prescription, you will reduce the chances of any undetected damage to your eyes.