You cannot directly say that refractive error is myopia. Refractive error includes myopia, hyperopia and astigmatism, excluding presbyopia and amblyopia. Myopia belongs to a specific disease within the scope of refractive error, which can be understood as a general term for refractive error is myopia, hyperopia and astigmatism, that is, refractive error can be divided into three categories: myopia, hyperopia and astigmatism. Doctors fill in the initial diagnosis of refractive error, often because there is no medical optometry, can not determine whether the low vision is caused by myopia, farsightedness or astigmatism, often referred to by the general term refractive error. Therefore, the concepts of refractive error and myopia should not be confused.