Tearing (Epiphora)

Synonyms

Epiphora

Definition

It is characterized by an abnormal chronic overflow of tears onto the cheeks, generally due to lacrimal drainage impairment or excessive lacrimal production.

Etiology

Tearing is part of the normal eye function; it provides not only a lubricated layer to protect the ocular surface but also is a natural barrier enriched with immunoglobulins and lysosomes to prevent any potential infection (Krachmer et al. 2011).

Many different conditions have been associated to cause epiphora and have been classified into chronic overproduction of tears, outflow obstruction, and failure of the tear pump (Krachmer et al. 2011).

Occurrence

Abnormal tear outflow is often unilateral. Overall, patients complain of ocular discomfort and blurry vision. A wide variety of medical conditions affecting the ocular surface, iatrogenic surgical manipulation of the lacrimal system, and the use of some medications present with epiphora (Millodot 2009; Krachmer et al. 2011; 2013–2014Basic...