thier pull on glycoma:

This disease is caused by increased pressure in the eyeball, which can lead to vision loss and complete blindness. But, experts in this field discovered that smoking marijuana reduced pressure in the eyes. The exact reason is still unknown.



^^^ well i think its pretty obvious to any "stoner" when you get red eye its the blood vessels in your eyes opening up as cannabis is a muscle relaxent, thus making it easier for the blood to pass as pressure would be released