Canine Corneal Disease Study Guide

Overview and Clinical Importance

Corneal disease represents one of the most commonly encountered ophthalmic conditions in canine practice and is a high-yield topic for the NAVLE. The cornea is the transparent, anterior-most structure of the eye, essential for light refraction and vision. Because it is avascular and continuously exposed to the environment, the cornea is particularly vulnerable to trauma, infection, and immune-mediated inflammation.

Understanding corneal anatomy, pathophysiology, and the clinical approach to corneal disease is critical for both examination success and clinical practice. Corneal conditions range from simple superficial ulcers that heal within days to complex melting ulcers and descemetoceles requiring emergency intervention.

Corneal Anatomy and Physiology

The canine cornea averages 0.62 mm in thickness (approximately half the thickness of a dime) and consists of four distinct layers, each with unique properties affecting disease presentation and treatment.