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) between masters of American roots music and Celtic music. Mairéad stated: «The title "The Widening Gyre" appeals to us and depicts the spiral of life, widening and embracing the new. It has an innate energy. We think that idea is reflected in the album's music». "The Widening Gyre" is a compelling development in Altan's story proving that they are still growing as artists, even after nearly thirty years together — the longest running lineup of founding members in Irish music. Altan recorded the new album over ten days from 29 July to 7 August 2014 entirely in Nashville, Tennessee (at