Sam
The only time you need to worry about glasses is if your applying for the RAAF, i think Law states (everyone correct me if im wrong) is that two sets are required to be on your person at all time in flight.
As for me i use to wear glasses when i first started training and i waited till i was about 23 and had laser eye surgery (best thing i have done in my life) and now the only glasses i wear flying are my sunnies. Good luck with your career.
A hint of advice. Dive head first into theory and get it out of the way first.
Jnr380