The IOL can be replaced again, and IOL implantation is a very common surgical procedure in ophthalmology. If the following conditions occur, IOL replacement may be required: 1. If the IOL is cloudy due to its own cause, and when the cloudiness is of a certain degree, the best corrected visual acuity is less than 0.3, IOL replacement will be required. 2. If the IOL is deviated due to trauma or suspensory ligament, which seriously affects the visual quality, IOL replacement will also be required. However, before the surgery, the IOL should be fully evaluated. However, before the surgery, the condition of the corneal endothelium, the condition of the posterior capsule and the condition of the suspensory ligament should be fully evaluated. If there are no contraindications to the procedure, IOL resurfacing can be performed. If there is a contraindication to surgery, IOL resurfacing cannot be performed. The IOL can be replaced again, but the condition needs to be fully evaluated.