Injury to the eye can cause loss of some part of the iris or a large tear causing the pupil to become misshaped. This can be a cosmetic problem and also, the extra light entering t... more
When a defect in the iris causing the pupil to be misshaped occurs as a birth defect it is called a coloboma. It can be repaired to make it round but is usually not necessary. An a... more
Eyes where the complete iris is lost through injury, surgery, or is absent from birth, have no pupil. These eyes can be helped by the insertion of a special lens called the aniridi... more