Retinal detachment with postoperative corrected visual acuity of 0.4 is commonly seen clinically due to injection of silicone oil, inert gases, and impaired macular function. 1. After the intraoperative injection of silicone oil into the vitreous cavity, the eye is in a state of high hyperopia, therefore, blurred vision may occur. 2. After the intraoperative injection of inert gas into the vitreous cavity, it will take about two weeks for the gas to be absorbed, and poorly corrected vision may occur before absorption. 3. Impaired visual function. Retinal detachment often affects the visual function of the macula, and poorly corrected vision may occur. The specific situation needs to be clarified by medical examination.