Myopia of 500 diopters combined with astigmatism of 100 diopters is corrected by choosing myopia lenses with astigmatism.
Myopia is corrected by wearing concave lenses, while astigmatism is corrected by wearing cylindrical lenses, which are designed with myopia and astigmatism in mind and are combined with concave lenses to form the same lens.
Patients with myopia and astigmatism are first examined by an ophthalmologist in a hospital to determine the exact amount of diopters, the axis of astigmatism, and other indicators, and then a prescription is issued by the doctor, who then prescribes eyeglasses, choosing lenses with both 500 diopters of myopia and 100 diopters of astigmatism, and fitting them in accordance with the astigmatism axes in the results of the eye examination.