It is not possible for the same eye to be both truly myopic and hyperopic; these two completely opposite refractive states cannot occur in the same eye at the same time. In general, one eye may be nearsighted and the other farsighted, which is a refractive error, that is, a difference in the refractive state of the two eyes. A high degree of refractive error can cause disuse amblyopia in the eye with a higher refractive error, so early detection and treatment are recommended. Because of the large difference in refractive error between the two eyes, if you cannot adapt or experience visual fatigue, you can try to wear contact lenses for correction. It is generally believed that refractive error of more than 200 degrees will destroy binocular monocularity by making it difficult to fuse the two eyes. Many patients will naturally use one eye to see near and the other to see far, and use the far-sighted eye to see far and the near-sighted eye to see near, because both do not need to adjust and collect, so they may not have any symptoms. People usually confuse presbyopia and hyperopia, which can exist at the same time. People who are nearsighted can also develop presbyopia, but those who are myopic will not develop hyperopia. In this group of myopic people, it is necessary to remove the original myopic glasses to see near, and to wear myopic glasses to see far to be able to see clearly. In short, there is no such thing as farsightedness and nearsightedness occurring in one eye at the same time.