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) lots of new stuff to savor and some reinventions of recognizable material as well, interpreted by some of the best musicians you can find in roots music.". "The Widening Gyre" received a four star album review (out of 5) from The Irish Times's reviewer Siobhan Long, stating that Altan "have reinvigorated their sound in the process of [recording in] Nashville with newcomer Martin Tourish on piano accordion [and] an all-star cast [of Appalachian bluegrass musicians]". The Arts Desk website's music critic Peter Quinn, stated: "Listeners looking for the uniquely driving tune sets that Altan are famous for have plenty to