After adulthood, if there are no special reasons, vision will remain relatively stable. Presbyopia will appear after the age of 40-45, so between the ages of 18-45 is the golden period of vision, the most stable and the best quality of vision during this period. The reason for vision loss after adulthood may be that the degree itself will increase, i.e. myopia will develop, and this should be ruled out because pathological myopia is still growing after adulthood. In addition, see if there are other eye diseases, such as cataracts, glaucoma, fundus disease, these diseases can cause vision loss. There are also special cases, such as the eye may be more stable, but the systemic conditions are not stable, such as high blood pressure, high blood sugar, can also cause vision fluctuations, so we need to identify the cause of vision loss to deal with the symptoms.