One eye is nearsighted, one eye is normal, what's going on?

Anisometropia refers to the difference in refractive power between the eyes on one or two meridians, which may cause differences in size and other aspects between the images on the retina of the two eyes. When the difference is very small, it can be ignored by the human eye. For example, it is generally believed that when the amount of anisometropia is less than 100 degrees, the problem caused by the difference is basically not felt, which is called physiological anisometropia. If the anisometropia exceeds 250 degrees, it may be difficult to fuse the image and show symptoms. In addition, due to the simultaneous accommodation of both eyes, the eyes with higher anisometropia are often in a blurred state of vision, which is easy to cause amblyopia. The eyes with higher anisometropia are more likely to become amblyopia.