A nurse is preparing to administer erythromycin ophthalmic ointment to a newborn immediately after birth. The nurse recalls that this medication is legally required and must be applied to a specific anatomical location. Which statement best explains why the nurse instills the ointment into the lower conjunctival sac rather than directly onto the eye surface?
- The lower conjunctival sac allows the ointment to coat the cornea evenly and prevents reflex blinking from expelling the medication immediately.
- The lower conjunctival sac is targeted because it contains more goblet cells that rapidly absorb erythromycin for systemic effect.
- Applying ointment to the lower conjunctival sac ensures even distribution across the conjunctival surface while minimizing direct irritation to the corneal epithelium.
- Instillation into the lower conjunctival sac is preferred because the upper eyelid is too fragile in neonates to retract safely during medication administration.