Lens diseases are common causes of blindness. These diseases, which cause vision loss if not diagnosed and treated early, are among the most important eye problems that negatively affect the living standards of cats and dogs. The aim of this study was to determine the distribution of lens diseases among cats and dogs according to breed, age and etiological causes, determine the conditions affecting the diagnosis and treatment of these diseases, report the success of the treatment, and present the data. The study material consisted of a total of 45 patients, 17 cats and 28 dogs of different ages, sexes and breeds brought to Istanbul University-Cerrahpaşa, Faculty of Veterinary Medicine, Department of Surgery and diagnosed with lens disease. After an anamnesis, signalement, a detailed eye examination, the diagnosis of the disease and its relationship with other ocular and systemic diseases were investigated, treatment procedures were determined and performed. Postoperative results of the surgical technique and success rates were determined. Patients were checked at regular intervals after treatment.