Cataracts do not have the problem of recurrence. This problem refers to the fact that after cataract surgery, the vision recovers quite well, and then slowly becomes blurred again. In fact, this is not the case. After cataract surgery, this kind of vision impairment and vision loss occurs again, which is called posterior cataract. After cataract surgery, there is a layer of posterior capsule behind the IOL. As time passes after cataract surgery, this layer of posterior capsule may become cloudy and gradually affect vision. In fact, this problem is quite easy to solve. After coming to the ophthalmology department, if the doctor finds that there is a posterior cataract, a YAG laser will be used to make a hole in the posterior capsule, so that light can enter the eye, and then a clear visual effect can be obtained again.