Cataract surgery usually does not recur, but if vision loss occurs several years after surgery, it is mostly due to posterior cataracts, which varies from person to person. Cataract is a disorder of lens metabolism caused by various reasons, resulting in the degeneration of lens proteins, which in turn causes crystal clouding. Cataracts can lead to blurred vision and vision loss. Mild cataracts can be improved by wearing glasses, while severe cataracts require surgery. After surgery, as time lengthens, usually after several months to years, the posterior capsule of the lens gradually becomes cloudy, which can cause another loss of vision, called posterior cataract. There are individual differences in the onset and severity of posterior cataract, and its pathogenesis is different from that of cataract, so it cannot be called cataract recurrence. After cataract surgery, patients should take anti-inflammatory treatment as prescribed by the doctor, go to the eye hospital for regular review, pay attention to regular work and rest, light diet, protect both eyes and reduce eye trauma.