Age-related Cataract & Classification — Topic Test
8 questions · exam mode (answers revealed at the end). 18 min suggested.
During phacoemulsification cataract surgery in a 68-year-old man, mydriasis is poor, the iris repeatedly prolapses and billows toward the wounds, and the pupil progressively constricts. He gives a history of tamsulosin use for benign prostatic hyperplasia. This intraoperative behaviour is best explained by dysfunction of which structure?
ACiliary muscle
BDilator pupillae smooth muscle
CSphincter pupillae
DLevator palpebrae superioris