My mum, boss and work colleagues have all had it done and all rave about the wonders of it. However I would agree that you should wait until you're closer to 23 than 20 as it is a procedure that you don't want to rush into early - the main reason people rave on about it is because they weren't 20 when they go it done and the risks are much lower as you age.

I'm hoping to get it done when I have the cash, but when I did have the cash at the age of 22 I decided against it based on advice from opticians who make money out of getting the procedure done. They had nothing to gain by telling me to not get it done until I was 23, but they told me anyway - this, to me, means that they is genuine reason behind not getting it done early and it's not just about eye stability.

It should also be noted that while I can still see what I consider to be fantastically with my old glasses, my eyes have still adjusted mildly over the past four years. Not to the point that it would cause a problem with laser eye surgery, but it does show that just because you don't notice anything doesn't mean that your eyes aren't still changing.

Of course, the best thing to do would be to seek advice from professionals to find out if there is any reason you should wait until you are 23 in your particular case. Personally, I would first seek an appointment with your optometrist and request information on your eyes that you can pass on to laser eye surgeries to see if it is in your best interests. That way you will get the advice of an optician as well as a surgeon, and you also have the information to go online to optician forums in order to find out impartial advice from other opticians/surgeons, too.

EDIT: The fact that you get migraines from staring at a screen when wearing glasses is something you should bring up to your optometrist first, though - because if you're wearing the correct perscription glasses then you should not get that problem regardless of whether you wear contacts, glasses or have laser surgery. It could be that your screen is not suitable for you, the screen settings are not suitable to you, you may need to make a point to leave your PC for a while every now and then, or it could be something else altogether that is causing the problem aside from your eyes. But if you are correct in saying that your glasses are fine then I would certainly say it's a sign that there is something wrong that will not be fixed by laser eye surgery.

To summarise: Go to your opticians about your screen/migraine problem as soon as you can, and mention that you are interested in advice regarding laser eye surgery.