Well, generally speaking, a cataract is a clouding of the normally clear lens of the eye, which can eventually block the central line of sight and impairs vision. And if there are some problems occur on it, you should take cataract surgery to heal it. So we can say that cataract surgery is an operation to remove the clouded lens. And after the surgery, your eyes will be sensitive and fragile. So doctor may suggest you wear a pair of sunglasses to protect your eyes when you go outside. And in common, sunglasses should be worn about 3 weeks. Also, you need to pay more attention to eye infection, which can just slow down the recovery process.