-8.0 diopters!!!
My eyesight is way less and they didn't even take a second look at me last year!!! In the UK the CAA Class 1 requiremnet is -3.0 diopters if you are under 25. -5.0 diopters if you are over 25 or have an unchanged perscription for at least 3 years.
Good Luck anyway
BTW