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
The Widening Gyre (album) studio to open up musically while somehow managing to help keep the integrity of Altan intact», the album is the result of a fusion «of the traditional Irish music that the members of Altan are known for, namely Donegal fiddling and Gaelic singing traditions, with American roots music, particularly that of the Appalachian bluegrass fiddle» and a celebration of the relationships between Altan and lifelong friends they've made through music. "The Widening Gyre" straddles time as it manages to remind listeners of the ancient bond between Irish and Appalachian music while at the same time breaking new ground through collaborations