How long should pressure be applied to the nasolacrimal sac after administering eye drops?

Applying pressure to the nasolacrimal sac after administering eye drops serves a critical purpose in enhancing the effectiveness of the medication. By applying pressure for approximately 10 seconds, you significantly minimize systemic absorption of the drug through the nasolacrimal duct, thereby keeping the medication localized in the eye. This technique helps ensure that a greater amount of the eye drop remains available to exert its therapeutic effects on the ocular surface rather than passing into the systemic circulation.

This timing strikes a balance between allowing enough time for absorption reduction without causing unnecessary discomfort or irritation to the patient. The other durations may not be as effective in limiting drainage of the drops – durations that are significantly shorter might not provide enough time for effective pressure application, while longer durations could lead to discomfort without further benefits.