Don't give up IJ! I went to a BA seminar when I was fifteen -they took one look at my glasses and just said, "Sorry, pal. We're not taking on pilots with glasses" What they didn't add was that it was a BA decision, and I could have easily gone with another airline!! Doh!
Now that the CAA have increased the leeway to +/-5 diaopta, it shouuld cover a lot more potential Class One applicants with 'poor' eyesight.
My corrected vision with contact lenses has been tested as better than 20/20 (20 being the size of the letters second or third up from the bottom of the eye chart -can't quite remember) Without them my hand at arms length is a blur.
So, moral is, don't give up. Try the eye exercises, I 've heard they really can work.