I personally suffer from dry-eyes. Enough that I can no longer wear contacts, so this was very important in development. I have had no issue with dry eyes using this product, and have tested it for hours of it being constantly on, with no issues at all. The variable control allows you to defog quickly on high, and then either maintain on low-flow, or turn off completely until needed again (which I most commonly do). Either way, all body compositions are a little different, but we have certainly minimized the possibility of having dry-eye issues during use, even if for long periods of time, which is quite rare.