Symptoms Any small object or liquid, even a grain of sand or a drop of detergent in the eye, can cause eye pain and even damage to the cornea. Absolutely forbidden Rubbing the eye, no matter how small, can scratch the cornea and cause infection. If a foreign body enters deeper into the eye, it is important to seek immediate medical attention. If a corrosive liquid is splashed into your eye, you must go to the hospital immediately; if your eye is still uncomfortable after self-treatment, with burning, edema or blurred vision, you should also ask your doctor to treat it with professional equipment, and do not act recklessly. First aid The first step is to blink hard and often to flush out the foreign body with tears. If that doesn’t work, pinch up your eyelids and rinse your eyes under the tap. Be careful to remove your contact lenses.