A visual acuity of 0.8 after hemifemtosecond surgery is normal if it is consistent with the preoperative corrected visual acuity, and abnormal if it is lower than the corrected visual acuity. 1. If the patient’s preoperative corrected visual acuity is 0.8, then the visual acuity after the hemifemtosecond surgery will generally return to 0.8, i.e., the preoperative corrected visual acuity, which is a normal phenomenon. 2. If the patient’s preoperative corrected visual acuity is higher than 0.8, such as 1.0 or 1.2, and the visual acuity is 0.8 after the hemifemtosecond surgery, then the expected results have not been achieved. Possible reasons are that the flap of the cornea has not been completely restored to normal, postoperative keratitis needs to be corrected, or reactive uveitis, you can use tobramycin eye drops, hydroxyglucosamine eye drops, etc. under the guidance of the doctor to fight inflammation and relieve fatigue, and to observe the recovery of visual acuity. It may also be caused by poor surgical results, which have not reached the expected level. In case of the above situation, follow-up the consultation in time and continue the treatment according to the doctor’s advice and instruction.