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) The Widening Gyre (album) The Widening Gyre is the twelfth studio album by Irish folk music group Altan and their eleventh studio album of original material, released in February 2015 on the Compass Records label. It was released to critical acclaim. This is the first studio album of original material to be released by Altan in almost 3 years since the release of "Gleann Nimhe – The Poison Glen" in 2012. This is also the first Altan album to feature new band member Martin Tourish on accordion. In January 2015, Altan revealed that "The Widening Gyre" would be the name