Feline Corneal Diseases Study Guide

Overview and Clinical Importance

Corneal diseases represent a significant proportion of feline ophthalmic conditions encountered in clinical practice. The feline cornea has unique characteristics that predispose cats to specific pathologies not commonly seen in other species. Understanding these conditions is essential for the NAVLE, as corneal diseases directly affect vision, comfort, and quality of life in affected patients.

Unlike dogs, cats have primary conjunctival and corneal pathogens, particularly feline herpesvirus-1 (FHV-1), which causes approximately 80-90% of infectious keratitis cases. This virus is ubiquitous in the cat population, with an estimated 80-95% of cats being latently infected. Understanding the relationship between FHV-1 and corneal disease is fundamental to feline ophthalmology.

Feline Corneal Anatomy

The feline cornea is an avascular, transparent structure composed of four main layers: epithelium, stroma, Descemet's membrane, and endothelium. Understanding corneal layer anatomy is critical for assessing ulcer depth and determining appropriate treatment.