I think eyeglasses are more expensive than an eye exam. Usually it will cost you more than $50 to get an eye exam. But the price varies according to the living standard of that area. While a pair of eyeglasses will cost your near $100, sometimes even more because the price of glasses is not fixed. I think both of them are necessary for you because you can't get a pair of prescription glasses if you don't have an eye exam first. If you don't go to an eye exam, the glasses can't help correct your vision problems exactly as what you want. So consult the stuffs that work in the lenscrafters.