The biosurgery can be done at the same time with cataract surgery, especially for patients with heavy cataracts, the cataract must be removed before the fundus surgery can be done. As for whether to install IOLs or not, it depends on the condition of the fundus and the intraoperative situation. If the fundus is very important and the function is very poor, it is not necessary to install IOLs because they will not improve the vision.