EASA eyesight standards have become much more relaxed in recent years. What the requirements actually state is that if your eyesight is correctable with contact lenses or glasses then you’ll be fine whatever your myopia. You’ll need to obtain an in-depth ophthalmology report to make sure there’s no pathology - not getting any worse because of an underlying condition.
You’ll get a VDL limitation on your medical requiring you to carry a spare set of glasses when undertaking flying duties.
I’ve seen Captains with -11 flying in the Middle East with no problems.