I haven't had any problems seeing yet, but then again I'm still 23.
However I do have problems with my hearing already thanks to four years of carrying a machine gun and explosions(training only not war symptoms dont want to give the wrong impression) so I use these little guys at work and on my car they are awesome (
http://www.amazon.com/Howard-Leight-.../dp/B001T7QJ9O ). They are battery operated to cancel loud noises (wives) but can be adjusted to hear ambient noise, and they are MP3 compatable.
Just another piece of gear I thought some people might like
