More directly from the CAA's own web site :
Distance Vision
Your visual acuity (your ability to see, tested by reading lines of letters on a chart at 6 metres) must be at least 6/12 in each eye separately and 6/6 using both eyes together, with or without glasses or contact lenses (correction). If you need correction the refractive error must not exceed +5 to -8 dioptres. This is in the most ametropic meridian (taking into account any astigmatism). Astigmatism must not exceed 3.00 dioptres. The difference in correction between each eye (anisometropia) must not be more than 3.00 dioptres. Your AME or optometrist will be able to explain these terms.
Just ask your optician if you meet these criteria ! Good luck !