Great thread, this on. I'm really glad I came across it. Just read the entire thing up to here LOL.
My eyes went off balance in the 80s and vain as I am I immediately went for contact lenses. First I tried soft, then hard gas permeable; did a lot of suffering to cut a long story short. Thankfully the materials they've developed since are much better, I now use silicone hydrogel monthlies, Biofinity brand at present, though I started on Bausch & Lomb PureVision. They were great and I once had a pair last 8 months! Then they changed the formula to PureVision 2 which seem more comfortable on first insertion but you quickly come to understand that they are an inferior product. So I swapped to Biofinity and they are great, really comfortable. I put them in first thing and take them out when I go to bed. Sometime I take a nap in the day without removing them and no problem there. I have slept the night with them too without problems, I remember the original PureVision ones came with advice that you could use them 24/7 but the total duration would be diminished, so rather than 30 days, only 15. What I've noticed is that sleeping or napping with contacts in tends to create more protein build-up, which feels like a tiny grain of sand in your eye. Its actually on the surface of the lens and can be impossible to remove. I use Bausch & Lomb Renu solution which is great and removes proteins as well, and I leave them to soak overnight in solution with a protein remover tablet every couple of weeks too, which helps keep them comfortable. Present lenses have been in for nearly 4 months now, no problem. My prescription is not very serious, I have 1.5 myopia each side, so another thing I can do is swap them over if needs be, if one is irritating one eye for instance chances are it'll be good in the other LOL.
From the thread: Tap water is a no-no. Saliva I never used either, as pointed out its not hygienic. I always wash my hands or at least the fingertips which touch the lens before touching them, and don't dry them as that causes tiny flecks of towel material (they call it lint) to adhere to your fingers which transfers to the lens.