Commute daily here in SW Florida....heavy rain/tstorms high % of the time on evening trips home during this time of year....use a sweat band to keep rainwater from washing salt/perspiration into my eyes.....use a velcro-attached plastic visor/winshield ($12+/-) onto helmet when it rains
(http://www.louisgarneau.com/usa/cata...yle_no=1405007)
....prevents rain from hitting eyes and with rainex, keeps more than clear enough to ride in .....actually love the rain....cools me down!