Circle Lenses: A Health Concern?

Today, a college friend approached me in the library's cafe to ask me about Physics. She suddenly interrupted her own question and remarked that I was wearing circle lenses. She then proceeded to tell me how they're bad for my eyes and that I shouldn't wear them for over 2-3 hours at a time. She said that oxygen is not getting to my eyes and my vision will deteriorate more. FDA has not approved circle lenses made in Asia.

I'm already a (-6.00, -6.00) from a family of glasses-wearers and I definitely don't take good care of my eyes. I stare at books and my computer screen all day long, sometimes nap or even fall asleep in them .. oops D: I also wear my 2-week normal contacts longer than I should ...

So basically I break every rule a contact lens wearer shouldn't : / Have my eyes fallen out? No. But I am interested in whether there are indeed more side effects of wearing circle lenses. I did some snooping around on the internet but didn't get any definite answers.

True, they are thicker and are supposed to last for a year, but does opaque colour over the iris matter? I personally think my circle lenses feel more comfortable than my normal contacts even.

What do you guys think?

How do you take care of your circle lenses and how long do you wear them each day? Have you ever gotten infections or seen your vision get significantly worse after a year?