Poor vision in January after full femtosecond surgery may be a normal physiological phenomenon, or it may be due to keratitis caused by high energy of femtosecond laser instrumentation, surgical operation and individual factors, etc., which should be clarified in time by going to the hospital for consultation. 1. Normal phenomenon: when patients use their eyes excessively, it may cause excessive evaporation of tears on the surface of the eyeballs, resulting in dryness and congestion of the eyes, and patients will have poor vision. It is recommended that patients do not use their eyes excessively, and can massage and relax their eyes. 2. Pathological phenomenon: it may be related to the high energy of early femtosecond laser instrumentation, surgical operation and individual factors, leading to keratitis in the patient’s eyes, which will be accompanied by different degrees of vision loss and blurred vision. It can be treated with glucocorticoid eye drops as prescribed by the doctor. Patients should follow the doctor’s instructions not to use the eyes excessively in the 6 months after the operation, review the vision regularly, monitor the vision regularly to see if the vision is stable or improved, and at the same time, patients should also pay close attention to observe whether there is any blurred vision, vision loss, etc., and once these situations occur, they should immediately consult the doctor for examination, so as to avoid delaying the condition.