Mydriasis disorders e.g. epilepsy, stroke, and impending brain herniation are known to lead to temporal mydriasis as well. A brain catastrophe, or a rapidly increasing brain mass, can cause compression of the oculomotor nerve. In cases of head injury or orbit trauma (eye injury), the iris sphincter (the muscle responsible for closing the pupil) or the nerves controlling it can be damaged, reducing or eliminating the normal pupillary light reflex. A mydriatic is an agent that induces dilation of the pupil. Drugs such as tropicamide are used in medicine to permit examination of the retina and other deep structures of the
Batman: The Widening Gyre it makes a unique “ka-klack” sound. Wayne hears someone behind him mimic the “ka-klack” sound. A horrified Batman turns around to discover that Baphomet is, in fact, the villain Onomatopoeia. The book ends on a cliffhanger, as Onomatopoeia begins to slit Silver St. Cloud's throat. "Batman: The Widening Gyre" received mixed reviews from critics, as many felt that Smith's trademark brand of crude humor felt out-of-place in a "Batman" comic. Particular criticism was directed at a scene where Batman confesses to Baphomet that, during , he misjudged the power of some explosives he was using, and the resulting blast of