The only way to clear the senses. I have been looking for rohto eyedrops for about five years. I left japan with two bottles and they were gone in a month.
Minty and clearing, I work in a very dry atmosphere so the little zing per drop really helps out!
Forget about the freezer! These things are for real. I used rohto eyedrops for the first time in the states a couple of weeks ago. If you study, sit in front of the computer, smoke-a-lot, these are something to ck out.