Is it normal to have a very constricted pupil after cataract surgery? what could be the reasons?

Depends: Your cataract surgeon may have used intraoperative medication to constrict the pupil (Miochol™, Miostat™). This is medication is used for a variety of reasons. Sometimes it's use is to assess vitreous presentation in the anterior chamber during capsular rupture. It is also used for anterior chamber intraocular lens placement & for performing an iridectomy. The pupil construction will resolve.

Not a problem: While the pupil is dilated during surgery, it rapidly goes back to undilated. Because the natural lens is much larger than the artificial lens, it pushes the iris forward giving some increase to pupillary size - which is what you are used to. After surgery then, the iris falls farther back and is smaller in many cases. Your surgeon can advise you on routine follow up for this.

Perhaps: If right after surgery it ould be due to medications laced n the eye during the procedure. If within the first couple of weeks, it could be from inflammation from the surgery. Best advice would be to ask your surgeon.

Dr Ham agreed