Which of the following is essential when administering eye drops?

Maintaining the dropper at eye level is essential when administering eye drops because it allows for better control and accuracy of the dosage. This position helps ensure that the drops fall directly into the eye rather than missing or spilling onto the surrounding areas. Keeping the dropper at eye level also helps the person receiving the drops to maintain a comfortable position, reducing the chances of blinking or moving, which can lead to ineffective administration.

The other options can compromise the effectiveness and safety of the medication administration. For instance, touching the eye with the dropper can introduce bacteria and lead to infections, which is why it's important to maintain a safe distance. Approaching from the front can also startle the person receiving the drops and lead to unwanted movement. Applying in large quantities is not recommended as it can cause overflow and waste the medication, leading to potential irritation.