Dim light

• What two muscles are involved in the eye's response to light?

  • Circular and radial muscles
• How does the eye react to dim light?

  • Radial muscles contract
  • Circular muscles relax
  • Pupils dilate so more light enters
• How does the eye react to bright light?

  • Radial muscles relax
  • Circular muscles contract
  • Pupils constrict so less light enters and damages the eye