Iris sphincter muscle Iris sphincter muscle The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called the iris. It encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil. It is found in vertebrates and some cephalopods. Initially, all the myocytes are of the smooth muscle type but, later in life, most cells are of the striated muscle type. Its dimensions are about 0.75 mm wide by 0.15 mm thick. In humans, it functions to constrict the pupil in bright light (pupillary light
Look at What the Light Did Now Kinks and Peggy Lee, and two studio recordings of a new song, "Look at What the Light Did Now", written by Little Wings. Prior to its December 2010 home video release, the documentary screened at number of international fall festivals, including the 2010 Raindance Film Festival in London, CPH:DOX in Copenhagen, and the Pop Montreal music festival in Quebec. "Look at What the Light Did Now" marks both Feist's first official documentary and first official live album. "Look at What the Light Did Now" received limited reviews upon release that were mostly positive. Music site Drowned in Sound gave the