Credit: FILE - In this May 20, 2012, file photo, people view an annular solar eclipse as they look towards the setting sun on the horizon in Phoenix. Destinations are hosting festivals, hotels are selling out and travelers are planning trips for the total solar eclipse that will be visible coast to coast on Aug. 21, 2017. A narrow path of the United States 60 to 70 miles wide from Oregon to South Carolina will experience total darkness, also known as totality. (AP Photo/Ross D. Franklin, File)
Expert: Thousands of people could lose vision from eclipse
