The foreign body sensation that cataract patients experience after surgery is due to the fact that the surgical incision has not yet healed completely, and it usually disappears within a week or so. Cataracts are one of the most common eye diseases affecting vision, and are most common in middle-aged and elderly people. They are usually caused by a clouding of the lens inside the eye, and require surgical treatment to replace the clouding lens with a clear IOL in order to restore vision. During surgery, a two-millimeter incision is made at the edge of the cornea, so it is normal to experience a foreign body sensation at the incision site in the early stages after surgery. This is a normal reaction to the incision. Generally, as the incision heals and repairs, the foreign body sensation disappears, and in most patients, the sensation disappears within a week or so. During the recovery period, if the patient feels that the eye is congested with blood, redness, foreign body sensation, pain and other symptoms worsen, you need to promptly review the doctor to determine whether there is a combination of infection and other conditions exist.