No, it is better that you do not go to the gym after a cataract surgery. If you do, it will easily affect the effect of the cataract surgery. This is because that doing sports can easily make the iris falling off in the eyes, making the patients obliged to take a surgery again. As to how long exactly after the cataract surgery can a patient do some sports, it is decided by the recovery condition of the patient, some will take only two weeks, some will need three to six months, though. And people had better not do too fierce sports in case of any potential accidents. After the surgery, people should not lift heavy things, do not rub the eyes, avoid lowing the head as possible as they can. And thep had better lie on the back when they are sleeping.