Parents often say to me in the clinic, “My baby has a congenital cataract, please help me arrange surgery for my child quickly!” When I look under the flashlight, there is indeed a small white dot in the pupil, but this is not a cataract, and it is found during surgery that there is actually no cataract. This is a congenital iris remnant of the white pupil. Pupillary remnants, also known as permanent pupillary membranes, are included in the range of developmental abnormalities of the vascular system and are extremely common clinically. The central vascular arch disappears at 6.5 months of embryonic life, and the other vascular arches and coexisting mesodermal tissues disappear at 7-9 months. If the normal atrophy of the above is not absorbed properly, this will result in a residual pupillary membrane being left behind. Congenital iris remnants are usually white membranes attached to the iris in the pupil area, which can be surgically removed to reveal the pupil, usually with a clear lens behind it, or partially clouded, and usually have little effect on vision, and do not need to be removed in one stage.