When you go shopping for eyeglasses, you may be pausing to consider spending the extra cash on designer eyeglasses and asking yourself: is it worth it? That is, ultimately, up to you, but there are a couple of things you'll want to consider before spending the money.The DownsidesThe only real major downside to designer eyeglasses are the cost. Luckily, this can be offset by a number of things. If your health insurance covers the possibility of designer eyeglasses, then you're already off the hook in terms of the extra costs involved. Of course, not all HMO plans will cover designer glasses.There are other options, though. For instance, if you need glasses for work, you may be able to write them off as a business expense. There are a lot of different ways you can cover the expense, but some