Never Never Never Cheat the system... it is there for a reason... (Right,, thats the Correct thing to say...now then)..On the other hand what you could do is play a little dumb and get your eyes zaped and say that you have always had great vision (who would know!!) if you got it done privately.
What I can tell you is that you are not going to become a cadet pilot with -8...that's a fact.
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"Hold your bloody Attitude...."