They're the cheapest and easiest option to help your eyes focus up close. You can pick up a pair at the pharmacy for less than $10. When your close-up vision first starts to go--typically in your early 40s--you may only need a 1.0 or 1.25 magnification. Later, you'll need more. But everyone is a little different so try a few on to see what you prefer. "Some people will stay at a lower level, simply because they like to hold their material farther away," says Koch. Others might use a 2.50 for reading and a 1.25 for the computer, since it's farther away than a book.