I got a chance to really think this one over recently.....
I came down with 'Iritis'. I know, sounds like a made up ailment, that's the first thing I told the eye doctor too.
Basicly, it's the muscles around your iris getting super inflamed (like arthritis). It hurts like..well...it hurts. Anytime your iris tries to adjust it feels like someone takes your entire eye and rubs sandpaper across it.
If it's not caught soon enough, it can cause blindness.
The first doctor I went to misdiagnosed it as allergies. After a week of putting cream in my eye, no results and had to go back.
Essentially, over the past month and a half, I've been modelling with my good eye open, and my other eye squeezed shut. The eye drops they gave me kill the pain and it's almost cleared up completely, but I'm getting a real lesson about taking my eyesight for granted.
On a lighter note, you'd get a kick out of some of my one-eyed attempts at detailing. I had to shelf a few things and now that I've got both eyes at almost 100%, I can tackle them again.
Take care of your eyes...wear goggles when people tell you you should and so on....