One eye has astigmatism while the other is normal, this is a very normal phenomenon, not both eyes will have the same refractive error, for example, one eye has 100 degrees of astigmatism, the other eye must have 100 degrees of astigmatism, this situation does not necessarily occur. If the difference between the two eyes is more than 200 diopters, it can be diagnosed as refractive error, which can still have a significant impact on the eyes. After this situation, you need to improve the corrected vision through frame glasses or corneal contact lenses as early as possible, which can improve the quality of vision and avoid eye fatigue; you can also be treated by surgery, which is more effective, because after the surgery, both eyes will see the same object.