A foreign body in the eye can be potentially dangerous if not removed. They fall into the category of either superficial foreign body which tend to stick to the front of the eye or get trapped under the eyelid; OR penetrating foreign body which are usually high impact, penetrate the outer layer (cornea or sclera) and enter the eye. Superficial foreign body are usually not serious, however penetrating foreign body requires immediate attention and treatment. Permanent loss of vision may occur even if treated immediately.