I wouldn't have thought glasses are a problem, my friend passed his class 1 and he has highly corrective glasses.
Here is a link to the CAA's visual standards. Not sure where abouts in Ireland you are, so you might have different reg's but I doubt they will be much different:
http://www.caa.co.uk/docs/49/SRG_MED...ber2010%29.pdf
Regards