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) 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