Equine Entropion Study Guide

Overview and Clinical Importance

Entropion is an inward rolling of the eyelid margin that causes the eyelashes and periocular hair to contact the corneal surface, resulting in ocular irritation, pain, and potential corneal damage. This condition is one of the most common eyelid abnormalities in foals and represents an important topic for the NAVLE examination due to its clinical prevalence and the critical nature of early recognition and intervention.

In horses, entropion primarily affects the lower eyelid and is most frequently observed in neonatal foals, though it can also occur in adults secondary to ocular pain, trauma, or cicatricial changes. Understanding the pathophysiology, clinical presentation, diagnostic approach, and treatment options is essential for preventing serious secondary complications including corneal ulceration and potential blindness.

Etiology and Classification

Equine entropion can be classified based on its underlying cause. Understanding these classifications is crucial for determining the appropriate treatment approach.