Mydriasis surgery. Mydriasis Mydriasis () is the dilation of the pupil, usually having a non-physiological cause, or sometimes a physiological pupillary response. Non-physiological causes of mydriasis include disease, trauma, or the use of drugs. Normally, as part of the pupillary light reflex, the pupil dilates in the dark and constricts in the light to respectively improve vividity at night and to protect the retina from sunlight damage during the day. A "mydriatic" pupil will remain excessively large even in a bright environment. The excitation of the radial fibres of the iris which increases the pupillary aperture is referred to as a
The Widening Gyre (album) Ireland, UK, Altan performed live no less than 10 songs (out of 14) from "The Widening Gyre": 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