Well, that usually means you need to move up in power. The first thing you should do is check the power of the glasses you currently have.
If they are non-prescription ready-made reading glasses, you can often find the strength marked on the inside of one of the temple arms.
Use this strength as a starting point, since you suspect that you need a stronger power than what you currently have. So, the only question is, “How much stronger?”
As mentioned earlier, the best way to determine what you need is, of course, to have an eye doctor perform an eye exam. But, if you are fairly certain that you just need a slightly higher strength, ordering glasses +0.25 or +0.50 diopters stronger than what you have may do the trick.
