Final answer:
When a foreign object enters the eye, the immediate step is to flush it out with water to prevent further irritation or injury.
Step-by-step explanation:
The first step to take when one gets a foreign object in one's eye at school is to flush the eye immediately. This helps to rinse away the object using the tear fluid and to reduce the chance of any potential injury or infection. It is not advisable to have a friend or teacher try to remove the object because they may not be trained and could cause more harm to the eye. Also, waiting until one gets home could allow the object to cause further irritation or damage.