The problem with 'readers' is that they magnify best in the middle of the lens. The focus deteriorates toward the edges whereas your reading glasses are correctly ground so that you can swivel your eyes without the image going blurry at the edges. The readers have some advantages though - they are lightweight, cheap, good as standby, and I really enjoy the way all the little bits (the pads that sit on one's nose bridge) keep falling off - this then tends to change the focus and the readers keep slipping off my face. I keep a couple of pairs around - at work, in the trumpet case pocket, in the car, and beside the lounge but I much prefer proper prescription lenses. I might think more closely about stand to eyeball focal length and go with special specs too.