Get a tissue and then close your eyes gently; not putting pressure that will cause the thing to infect or injure the sensitive eye. The tear production will start automatically inside the eye when something flows into it. So, you have to just gently increase pressure so that the whole phenomenon of tear production escalates. However, never rub the eye because it can cause damage which might be very critical. Use the tissue in your hand to wipe off the tears that run down your face.
Try to cry at the moment as that will help to clean out your eye and wash it completely which will wipe off the dirt material or anything that has flown into the eye. Try to think of some sad events which will make you cry or something that will just automatically bring tears to your eyes.
Blink your eye as much as you can so that the probability of your eye lid catching the substance in your eye inflates excessively.
Stretch the upper and bottom eye lids in opposite direction and then try to blink. It will allow the lashes on the lower eye bid to clean the eye from any dirt or substance.
Wash your eyes with clean water. However, don’t put a lot of pressure behind your swing of the hand to put water in your eye. Keep it gentle and smooth.