25 Pupil

Pupil

  • Black circle, center
  • allow light signal to go through lens

Iris

  • sphincter: circular muscle, when contract decrease diameter
  • dilator: radially oriented; fibers sticking out from center; increase size

Function

Miosis

  • when eye down and out, evaluate pupillary dilation to see if parasympathetic intact

Adie's tonic pupil

  • dilated pupil on one side

Mydriasis