I understand myopia as short-sightedness therefore the +/- 5 limit applies to this - you are well within this limit. The 2.00 limit is for astigmatism - you have none so seem to meet this requirement as well.
I think there are two limits - one for short/long-sight (+/- 5 either way) and one for astigmatism (2.00).
This is how I've alsways understood it...in which case you are well within limits and are unlikely to suffer any massive degradation (looking at your age).
Think you're fine mate
V1R
P.S. Run a search on "Deviation" etc. - you'll find tonnes of info on borderline cases...I've read and posted in many. The CAA are very helpful.