An ophthalmologist explains the conformation of an eye as students listen in a class at Guangmingjie Primary School to mark the coming 13th national eye-care day which falls on June 6, in Jinan, capital of east China's Shandong Province, June 4, 2008. This year's theme for the national eye-care day is "a pair of bright eyes to greet the Olympic Games." [Xinhua]