Why patch both eyes if a foreign body is impaled in the eye?

Patching both eyes when a foreign body is impaled in one eye helps to prevent eye movement, reducing the risk of further injury to the affected eye. It also minimizes the potential for sympathetic ophthalmia, a rare but serious condition where inflammation occurs in the uninjured eye. Additionally, covering both eyes can help the patient feel more comfortable and less disoriented until professional medical help is available.