Havana has also been a popular health tourism destination for more than 20 years. Foreign patients travel to Cuba, Havana in particular, for a wide range of treatments including eye-surgery, neurological disorders such as multiple sclerosis and Parkinson's disease, and orthopedics. Many patients are from Latin America, although medical treatment for retinitis pigmentosa, often known as night blindness, has attracted many patients from Europe and North America.