Eyes

• The Cornea is transparent. It refracts light into the eye.

  
• The Iris contains muscles. That control how much light can enter the eye.

  
• The Lens focuses the light into the retina and changes shape to focus.

  
• The Optic Nerve carries impulses from receptor (on retina) to brain

  
• Very bright light can damage the retina.

  
• Describe how the brain receives information about light entering the eye.

  1. The retina detects light
  2. And Send electrical impulses
  3. Along the optic nerve to brain.

  
• The Sclera is the outer part of the eye and it protects the eye.

  
• The pupil allows light rays to enter the eye.

  
• The Lens controls the size of the pupil.

  
• What are the names of the two types of receptor cells in the retina?

  • Cone Cells
  • Rod Cells
• What two things are the eyes sensitive to?

  1. Colour
  2. Light