The owner of this 6-year-old castrated male German shepherd first noticed that it had a cloudy right eye six months ago. The owner became concerned when a dark blob appeared at the lateral limbal region (see below). You measure the intraocular pressure, and the results are 40 mm Hg in the right eye and 15 mm Hg in the normal-appearing left eye.
What is the most likely reason for the increased pressure in the right eye?
a) Primary glaucoma
b) Glaucoma secondary to an intraocular tumor
c) Glaucoma secondary to chronic uveitis
d) Glaucoma secondary to cataract
e) Glaucoma secondary to trauma