Multiple choice

Epiphora is due to

  1. obstruction of nasolacrimal duct

  2. obstruction of salivary duct

  3. severance of nasolacrimal duct

  4. severance of salivary duct

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Explanation

Causes of epiphora include occular irritation and inflammation (including trichiasis and entropion) or an obstructed tear outflow tract, which is divided according to its anatomical location (i.e. ectropion, punctual, canalicular or nasolacrimal duct obstruction). The latter is often due to ageing (a spontaneous process), infection (i.e. dacryocystitis), rhinitis and in neonates or infants, failure of the nasolacrimal duct to open.

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