I believe it is a sty. A sty is an acute infection or inflammation of the secretory glands of the eyelids. It sometimes causes, because you get dirt in your eye. I don't think it would be a sty. More than likely it is a cornea ulcer. You should see your local optomatrist.
It has alcohol that can burn your cornea.
depends on how long you stare at it before you blink...
Only if you forget to blink and your eyes get dry .
Unlikely, but it can certainly hurt. Migh even abrade your cornea some.
Your Eyes begin to hurt after a time on the computer because you tend to blink less and so they become dry. So look away from the screen.
Knees can become injured as a result of trauma, osteoarthritis's or rheumatoid arthritis to name but a couple of reasons.
when they get hurt.
Tears lubricate your eyes. Dry eyes hurt especially when you blink. They also help to clean the gunk that you get in your eyes out.
Developing
It causes mass flooding which causes destruction of civilization and farms
The fact is you can go search every where and ask any one but blinking your eyes while you sneeze is a natural body reaction. When you see a bright light you sneeze and your eyes close so that they can shut longer than when you blink so you won't hurt your eyes . As much as you try not to blink you cant because when you sneeze your entire body shuts down for that time so your eyes close as well. Another reason why you naturally blink when you sneeze is that if you did not blink while sneezing, your eyes would pop out.