What is the most common cause of secondary glaucoma in dogs?

The most common cause of secondary glaucoma in dogs is uveitis. Uveitis refers to the inflammation of the uveal tract, which encompasses the iris, ciliary body, and choroid of the eye. When uveitis occurs, the inflammation can lead to the accumulation of cellular debris and inflammatory mediators in the anterior chamber of the eye. This can disrupt the normal drainage of aqueous humor, increasing intraocular pressure and potentially resulting in glaucoma.

The pathophysiology involves the formation of adhesions, known as synechiae, between the iris and the lens or the cornea, which can further obstruct the drainage angle (trabecular meshwork). Consequently, uveitis often presents with signs such as ocular pain, redness, and a change in vision. Managing the underlying inflammatory condition is critical in controlling the potential progression to glaucoma in affected dogs.

While lens luxation, neoplasia, and neovascularization can also lead to secondary glaucoma, they are not as prevalent as uveitis in the context of veterinary practice. Lens luxation occurs when the lens becomes dislocated, which can also obstruct aqueous humor drainage but is less frequently a cause compared to inflammation from uveitis. Neoplasia might affect