Myopia and hyperopia are two different refractive states that cancel each other out.
Nearsightedness and farsightedness are both refractive disorders, but they are opposite states, with the light entering the eye focusing in front of the retina in myopia and the light entering the eye focusing behind the retina in hyperopia.
Therefore, the degrees of myopia and hyperopia cancel each other out. As an example, adding a 100-degree hyperopic lens in front of a 300-degree myopic lens, after offsetting, would be equivalent to a 200-degree myopic lens.
Whether a patient is currently nearsighted or farsighted should be determined by a detailed examination by an ophthalmologist at a hospital, followed by a treatment plan.