You can buy “ready-made” reading glasses in many shops. However, the frames are mass produced and so may not fit you very well. They assume that the distance between the eyes is the same for everyone so the lenses may not be correctly aligned with your eyes. They contain a “simple” prescription which is unlikely to be exactly right for your eyes. They have the same lens for each eye but many people require a slightly different lens for each eye. Glasses made specifically for you will offer more comfort and give you better vision.