Pupil Reflex

• Pupil reflex: adjusting for high and low light intensity
• With low light intensity: radial muscles (straight lines) contract and become shorter to pull the pupil (black dot) making it wider, to let more light enter, to form a clear image on retina
• With high light intensity: circular muscles (circular lines) contract and become shorter to reduce the size of the pupil to protect retina from bleaching.