This presentation discusses various abnormalities of the pupil. It begins by describing the normal anatomy and function of the pupil. It then discusses several types of abnormal pupils including anisocoria, abnormally large pupils, abnormally small pupils, and Marcus-Gunn pupil. It also covers several diseases that can affect the pupils, including congenital abnormalities like aniridia, iris coloboma, and leukocoria, as well as acquired structural abnormalities and various neurological abnormalities such as Horner's syndrome, Adie's tonic pupil, and Argyll-Robertson's pupil. For each abnormality, it provides details on signs and symptoms, causes, and potential treatments.