Under normal conditions, tears in the eyes are drained into the lacrimal sac through small openings called the upper and lower puncta located at the inner corner of the eye (called medial canthus).

To instill eye drops properly, place the medication in the lateral canthus and pinch the medial canthus “drain.” This prevents some of the drop from reaching the nasal mucosa, which can cause systemic ...

Under normal conditions, tears in the eyes are drained into the lacrimal sac through small openings called the upper and lower puncta located at the inner corner of the eye (called medial canthus).