Shocked!

This afternoon, I made a trip to australia fair. Part of my shopping list was to buy contact lens as i only got 2 pairs when I came (proudly sponsored by dardardar) and I was already on my second pair. So I went to an optical shop thinking that I could just get a pair or two off the shelf. The first time I asked her, what she told me was :" Yes we do sell them but you will need prescription to buy them." I got a little shocked and confused so I simply thank her and left the shop.
I continued wandering around but my mind was thinking all about it. Medicine need prescription I understand but why do you need prescription for contact lens? Will I die from overdose of contact lens? Hmm so after awhile I went back to the shop and asked her how I could get the prescription and if there are shops that I could just buy them off the shelf. She explained that I could get them from an optician after inspecting my eyes and I had to go through trials before i could offically buy them off the stores. All in all they would cost around A$160++ and I had to go through this process to buy them from any other stores. I explained that I am already wearing them and I have used them for a long time but she said that they needed to certify that I am suitable for it before they could sell them to me.. Hmm what weird law~ lol
So guys, you have been forwarned.. Don't every think that you could come to Australia and just buy your contact lens!