Structure of the eye

• Sclera- the tough, supporting wall of the eye
• Cornea- The transparent outer layer found at the front of the eye.

  It refracts (bends) light into the eye
• Pupil- The hole in the centre of the eye, through which light enters
• Iris- Contains muscles that allow it to control the diameter of the pupil and therefore how much light enters the eye
• Retina- The layer at the back of the eye that contains two types of light receptors:

  • One sensitive to light
  • One sensitive to colour
• Lens- Focuses the light onto the retina
• Cillary muscles and suspensory ligaments- Controls the shape of the lens
• Optic nerve- Carries impulses from the receptors on the retina to the brain