Treatment targets the underlying cause rather than just stopping the tear overflow.
[Normal Tear Production] │ ▼ [Eye Lubrication] │ ▼ [Nasolacrimal Duct] ───► (BLOCKAGE CAUSES) ───► [Epiphora / Tear Overflow] │ ┌───────────────────────┼───────────────────────┐ ▼ ▼ ▼ Inflammation Developmental Mechanical (FHV-1, conjunctivitis) (Imperforate puncta) (Foreign bodies, tumors) feline blocked tear duct