Because they are caused by bacteria. So when you rub or touch it, you now have the bacteria on your finger. If you don't wash your hands, you can then pass that bacteria along, usually to your other eye, but it can also be passed by touch to another person's eye, mucus membranes, or open wounds.
Yes stys aren't contagious ( I don't think)
Kym Stys's birth name is Kymberly Stys.
Kym Stys is 5' 4".
Kym Stys was born on December 8, 1973, in Honolulu, Hawaii, USA.
Radoslaw Stys was born on August 11, 1968, in Warsaw, Mazowieckie, Poland.
Zdzislaw Stys was born on January 8, 1960, in Nowa Sl, Lubuskie, Poland.