Just phone the medical dept, but the eyesight limits are on the website.
Also, you may be pleased to hear they have just changed their opinion on laser surgery;
Instead of having to wait 12 months to see it was successful and therefore your eyesight is ok, you only have to wait just 3 months.
But, beware;
Laser surgery is not for everyone,
To my dissappointment, you have to be over 21.
Ultimate recommendation is that you are over 25.
Good luck with the medical! Hope you get one! I was in the same boat as you until they changed the rules last year.