The left eye is not nearsighted, the right eye is nearsighted, this situation is also called monocular myopia, this is a very common phenomenon, the refractive state of the eye changes are not synchronized, so most people myopia, in the two eyes are not necessarily the same degree, appear monocular myopia is also very normal phenomenon. For this situation is the need for early correction, especially if the two eyes are very different, more early correction, otherwise the two eyes have different objects, one large and one small, very uncomfortable, and over time may lead to strabismus or amblyopia. For the correction of this situation, it is recommended to choose corneal contact lenses, which is usually called contact lenses, this way can effectively avoid the two eyes object image is not equal to the situation, the biggest disadvantage of frame glasses is that the eyes do not see things as equal, so it is very uncomfortable.