Mydriasis eye, and also to reduce painful ciliary muscle spasm (see cycloplegia). One effect of administration of a mydriatic is intolerance to bright light (photophobia). Purposefully-induced mydriasis via mydriatics is also used as a diagnostic test for Horner's syndrome. Mydriasis can be induced via modulation of adrenergic or cholinergic signalling. Within the adrenergic system, norepinephrine is a hormone and neurotransmitter responsible for regulating physiological processes in the body, including the involuntary muscles of the autonomic nervous system (such as the dilation or constriction of the pupil aperture via the muscles of the iris). Modulation of norepinephrine signalling can induce mydriasis. For
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