Cataracts are a leading cause of blindness in dogs. Diabetes mellitus is the most common cause of metabolic cataracts in dogs. Once the diagnosis of cataracts has been made 50-70% of dogs will develop cataracts within six to twelve months. Currently, phacoemulsification is the preferred technique for removal of cataracts. Following surgical removal of a cataractous lens, vision is dramatically improved. However, an eye without a lens is far-sighted since the lens is not present to focus incoming light onto the retina. With implantation of an intraocular lens, incoming light rays are focused such that the focal point is at the retinal plane, improving vision.