The postgraduate degree in ophthalmology is called MD in Ophthalmology. CPMC itself hosts residencies in Internal Medicine, Ophthalmology, Radiation Oncology and Psychiatry. Ancient Roman medicine was divided into specializations such as ophthalmology and urology. It also has divisions for Ophthalmology and Otolaryngology and a morgue. An ophthalmologist is a specialist in ophthalmology. These services include ophthalmology, physiotherapy and audiology, but not most dental services. It also provides the city's specialist neurosurgical, ophthalmology, ENT, and dentistry services. Specialised private hospitals in the fields of ophthalmology and dentistry are common. NHPs are commonly used in preclinical trials, neuroscience, ophthalmology studies, and toxicity studies. Tilganga Institute of Ophthalmology is an Ophthalmological hospital in Kathmandu. In Canada, an ophthalmology residency after medical school is undertaken. Stem cells are also in clinical phases for treatment in ophthalmology. Point spread functions have recently become a useful diagnostic tool in clinical ophthalmology. In medicine, Hunayn wrote an important treatise on ophthalmology. After completing his residency in ophthalmology, Paul moved to Bowling Green, Kentucky.