If your vision is so unstable you need a new RX every year your LASIK isn't going to last very long. Hence you probably are a very poor candidate for LASIK and it makes no sense from a strictly financial sense.

Unless you wear contacts, which can get pretty expensive, but probably not as expensive as LASIK that lasts 10 years.

I'm not sure why you'd get an eye exam every year unless you were having problems or needed a new prescription.