Patients with cataracts who sometimes see clearly and sometimes do not see clearly are often associated with worsening lens clouding, which usually requires surgical treatment. Cataract is a common eye disease that affects vision. In the early stage of cataract development, the clouding of the lens is not uniform, and may be more serious in the central part of the clouding, while the peripheral part of the clouding is lighter. At this time, when the environment is bright, the pupil will be narrowed, there can be a significant loss of vision, while the environment is darker, the pupil will be enlarged, and will feel able to see more clearly. There is no way to recover from this condition through medication. If cataract patients’ vision loss has already affected their normal life, work and study, they should consider surgical treatment, which will remove the cloudy lens inside the eye, and then implant a transparent IOL to replace the original lens, thus restoring their vision. Cataract patients are advised to seek prompt medical attention to assess their condition and follow the doctor’s instructions to choose the appropriate treatment.