Canine Glaucoma Study Guide

Overview and Clinical Importance

Glaucoma is defined as a group of optic neuropathies characterized by progressive retinal ganglion cell death and optic nerve degeneration, typically associated with elevated intraocular pressure (IOP). It is one of the leading causes of irreversible blindness in dogs, affecting approximately 0.9% of purebred dogs in North America. Glaucoma is also a major cause of ocular pain and is the most common reason for enucleation in dogs.

Understanding glaucoma pathophysiology, classification, clinical signs, and treatment options is essential for the NAVLE examination. The disease represents a true ophthalmic emergency when presenting acutely, as irreversible vision loss can occur within hours of IOP elevation.

Aqueous Humor Dynamics and Pathophysiology

Aqueous humor is a transparent fluid produced by the ciliary body epithelium that provides nutrients to the avascular lens and cornea while maintaining IOP and globe shape. Understanding aqueous humor production and drainage is fundamental to understanding glaucoma.