As we all know, people naturally get foggy when they get older. However, some people need to wear presbyopic glasses when reading at the age of 40-50, and as they age, they can read books and newspapers at the age of 60-70 instead of needing presbyopic glasses. Generally speaking, patients are very happy at this time, thinking that it is because I am getting younger and younger, and the presbyopia is gone, which means that their eyes are healthy. Is this really the case? What is this all about? Presbyopia, medically known as “presbyopia”, is a decline in the function of the ciliary muscle in the eye due to age, which in turn causes a decline in the adjustment ability of the human eye, and eventually disappears. In layman’s terms, the eye is like a fully automatic camera, and presbyopia is the process by which the camera’s ability to focus automatically decreases until it disappears. This process generally begins at the age of 40 and ends at the age of 60, which is characterized by unclear vision and the need to wear fancy glasses, and no longer increases after the age of 60. This shows that presbyopia is a normal physiological phenomenon, not a disease, and each will appear. People can not return to old age, eye muscle function has declined, is not automatically restored, so it can be said with certainty, fancy eyes is not possible to get better or disappear on their own. However, what happened to the people we saw who felt that their presbyopia had disappeared? After examination, people who have such a phenomenon are usually patients with cataracts. In the early stage of cataract, the refractive state of the eye slowly changes to “myopia” because the density of the lens increases and gradually becomes cloudy. Presbyopic lenses are corrected with “convex lenses” while myopic lenses are corrected with “concave lenses”. When the two are superimposed, the lens prescription of presbyopia is reduced or disappears. In the early stage of cataract, some patients show that the “presbyopia” is reduced or disappeared, and they can see closer than before. However, such patients usually have less clear vision in the distance. As the disease gradually develops, it becomes unclear to see near and far. Therefore, in general, if there are phenomena that go against the natural pattern, you should be alert to whether you are suffering from certain diseases.