Mydriasis 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 mydriasis.
The Widening Gyre (album) the titles of some of the new tracks. The very same day, on their "Widening Gyre" iTunes page, Altan revealed the titles of the 14 tracks from their new studio album and released them for sale. On 27 January 2015, on their "Widening Gyre" Compass Records page, Altan made available short snippets of their new tracks. Mairéad Ní Mhaonaigh introduced the music on the album as an exploration of the influence of Appalachian music on Irish music. Recorded «with many good friends in the studio and Compass Records co-founder Garry West in the producer's chair steer[ing] the band in the