I've added Australia to the subject line so we can find this easily in the future... how great to know there's a good resource for this in Aus. DCR, I'm excited for you. Let us know how the 5hr test goes!
Yup. My lenses are 18.5mm and I think that's a pretty common size for PROSE; I know many with larger lenses. It depends a lot on eye size and how tight your lids are.
However, did you know many wearers of boston sclerals are 18mm? Rebecca could back me up on this.
The Dry Eye Zone