This case report describes the presentation, clinical signs, diagnostic evaluation, and treatment of a ten year-old male castrated Maltese dog with a one year history of progressive vision loss. Based on the dog's signalment, clinical signs, and history of diabetes mellitus, he was diagnosed with bilateral immature cataracts with a recent history of lens-induced uveitis in his left eye. Subsequent to routine blood work and urinalysis, an electroretinogram (ERG) and ocular ultrasound were both performed confirming the health of the retina and anatomical appearance of the posterior segment of both eyes. Phacoemulsification with intraocular lens placement was performed in both eyes. There was significant improvement in the dogs vision post-operatively.