B10.5 The Eye (Structure)

• Cornea

  • Transparent
  • No Blood Cells (Oxygen diffuses in and out)
  • Refracts light
• Iris

  • The coloured part of the Eye
  • Controls how big or small the Pupil
• Pupil

  • A gap in the middle of the Iris that allows light to travel through the Lens
• Lens

  • Refracts light
  • Can change shape to effect how strongly light is refracted
• Retina

  • Cone Cells - Respond to coloured light so we can see colour, however, aren't very sensitive
  • Rod Cells - More sensitive and can see in the dark, but can't respond to colour (Only Black and White)
• Fovea

  • A part of the Retina made up of only Cone Cells
  • Part of the Retina where light is focused on

  This is so we can see images more clearly
• Optic Nerve

  • Transmits Impulses from Receptor Cells in the Retina to the Brain