Feline Ocular Manifestations of Systemic Diseases – NAVLE Study Guide

Overview and Clinical Importance

The eye serves as a diagnostic window for the clinician, allowing direct visualization of the central nervous system and peripheral vasculature through the transparent cornea and lens. Systemic feline diseases including infectious (parasitic, bacterial, fungal, viral), neoplastic, metabolic, vascular, and immune-mediated conditions frequently present with ocular manifestations. Recognition of these ocular signs is critical for early diagnosis, treatment, and prevention of vision-threatening complications.

The high rate of blood flow to the eye increases the likelihood that uveal vasculature will trap circulating infectious agents and metastatic neoplastic cells. Furthermore, ocular immune responses are characterized by suppression of delayed-type hypersensitivity reactions, which allows various systemic pathogens to evade immunity and persist within the eye.

Systemic Hypertension

Systemic hypertension is the most common cause of intraocular hemorrhage and retinal detachment in cats. It represents the most frequent cause of acute vision loss in older cats, typically presenting as sudden bilateral blindness with dilated, unresponsive pupils.