I have hyperopia, which means magnifiers like these have always sufficed for my vision correction. But I've gone thru many other magnifiers and the lenses are always kind of funky when you're not looking straight thru the middle of the lens. I've also done expensive (10x the price) prescription lenses and have found similar. Somehow the aspheric lenses on these Jet Readers have been superior to them all. Originally bought a pair years ago and they survived even though I've worn them non-stop (not just for reading). I had forgotten where I got them and when I figured it out and was able to order a new pair it made me far happier than it should have.