Docash - it shouldn't be an issue provided you can read the chart at the initial Class 1 unaided. I have virtually the same prescription as you and can achieve 6/6 without glasses, but found the chart at Gatwick very tough to read.
I will be renewing it out in the States and having already been for an FAA Class 3 out here (virtually the eyesight equivalent of "How many fingers am I holding up?"), I know I'm achieving 6/5 in one eye and 6/6 in the other, but Gatwick tested me at 6/9 and 6/6 respectively.