To know the degree of your eyes you need to have an optometry test. Eye prescription refers to the number of degrees of refractive error in the eye. Refractive errors include myopia, hyperopia, and astigmatism, all of which can cause blurred vision. It is very difficult for patients to determine which type of refractive error and the degree of refractive error they are currently suffering from, and they need to go to the ophthalmology department of the hospital to undergo an optometric examination to confirm the diagnosis. The results of the optometric examination will not only show the specific type of the patient’s refractive error, but also the degree of the patient’s refractive error, as well as the axial direction of the astigmatism, the pupillary distance, and other important parameters. The patient can then wear glasses to correct the refractive error according to the prescription issued by the doctor.