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...
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.
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 cornea has a high density of nerve endings and blood vessels, which contribute to its rapid healing process. The outer layer of the cornea, called the epithelium, can regenerate quickly due to its high metabolic activity. Additionally, the cornea receives a rich supply of oxygen and nutrients from the tear film, which also aids in its fast healing.
army men can get that badly hurt that it causes sudden death or survire suffering
Wet tail is generally not transmitted to humans. Wet tail is a form of stomach upset or diarrhea that causes a hamster or other small mammal to become ill.
That has never happened yet, but theoretically, your eyes would burn and hurt a lot because dust had gotten in your eye, and because your eyeball is 300 times more sensitive than your skin, it would hurt a ton.