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
In the Light of What We Know read slowly and meditatively; one is moved to think of Thomas Mann’s "The Magic Mountain"…this powerful debut…is a unique work of fiction bearing witness to much that is unspeakable in human relationships as in international relations.” In a “Books of the Year” feature in "The Times Literary Supplement", Oates further wrote that “among outstanding novels is the impressive debut of Zia Haider Rahman, the meditative, mysterious, decidedly non-page-turner "In the Light of What We Know", a postcolonial novel writ large. The meticulous interweaving of Rahman’s fiction necessitates reading both forward and back, and makes us realize: who cares about “page-turners”