Eyes 👀

• What type of organ is the eye?

  A receptor organ
• What does the eye detect?

  Light
• What does the cornea do?

  Helps focus light on the retina
• What does the ciliary muscles do?

  Pulls the lens into focus
• What does the optic nerve do?

  Carries electrical signals to the brain
• What does the lens do?

  Focuses light onto the retina
• What does the retina do?

  Detects light and produces electronic signals
• What does the iris do?


  Controls the light levels entering the brain
• What does the pupil do?

  The hole that lets in light
• What is the retina made up of?

  Rods and cones
• What is the role of rods?

  Detect difference in light intensity
• What is the role of cones?

  Detect colour
• What light do rods work best in?

  Dim light
• What light does cones work best in?

  Bright light
• How are rods distributed?

  Arranged evenly around most of the eye
• How are cones distributed?

  Arranged around optic nerve
• What happens in the process of rarefaction?

  In a "healthy" eye, light is focused onto the retina by the lens and cornea