Myopia, astigmatism, and hyperopia are very common eye problems among the population and are usually diagnosed in childhood. In fact, one in five school-aged children requires vision correction. According to the ophthalmology department at San Juan de Dios Hospital, a child should have their first eye exam at age 3 and this exam should be repeated every year or, at most, every two years. "Early detection and treatment of vision problems can prevent the progression of vision loss and prevent disease," the ophthalmologists at San Juan de Dios explain.