Foreign objects can easily enter the eyes, causing eye discomfort or injury. Dust, sand, debris and other particles are the common examples. In addition, high-speed machining, grinding or hammering can generate tiny metal fragments, and these metal fragments are very dangerous.
When foreign objects enter the eye, they may be in the conjunctiva, or in the cornea. Do not use hands to rub the eye. If the foreign objects are tiny, such as eyelashes or sand, using eye blinking and tears, the eye itself may drain out these foreign objects.
In some situations, try gently rinsing the eye - this may flush out the foreign object. In severe cases, such as larger foreign objects or metal fragments, do not try anything, immediately go to nearest emergency room.