<prompt> Which muscle is contracted as pa of the pupillary light reflex?Ciliary musclePupillary dilator musclePupillary sphincter muscleRadial fibers of the iris  <response>: In a normal individual, shining a light in either eye will result in both pupils constricting due to contraction of the pupillary sphincter muscles. In contrast, the pupillary dilator muscle dilates the pupil. The ciliary muscle is involved in focusing the eye accommodation. 