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) studio to open up musically while somehow managing to help keep the integrity of Altan intact», the album is the result of a fusion «of the traditional Irish music that the members of Altan are known for, namely Donegal fiddling and Gaelic singing traditions, with American roots music, particularly that of the Appalachian bluegrass fiddle» and a celebration of the relationships between Altan and lifelong friends they've made through music. "The Widening Gyre" straddles time as it manages to remind listeners of the ancient bond between Irish and Appalachian music while at the same time breaking new ground through collaborations