The canine or feline lens may become dislocated from its normal position within the patellar fossa posterior to the iris. This may be result of hereditary factors (predominantly abnormalities of the suspensory lens zonules and/or vitreous body), chronic intraocular inflammation, vitreous syneresis, glaucoma and/or trauma. Commonly affected breeds include multiple terrier breeds (Sealyham, Jack Russell Wire Haired Fox & miniature bull Terrier) the Australian Cattle Dog, German Shepherd & Shar Pei. Subluxated lenses may be managed either medically (using anti-inflammatory therapy) or, more commonly, by surgical removal.