the eye

• Where is the sclera

  White part of the eye
• what is the function of the sclera

  protects the eye
• where is the cornea

  front part of sclera
• what is the function of the cornea


  barrier against dirt
• where is the iris

  eye colour
• what is the function of the iris


  controls how much light passes through the pupil into the eye
• description of the lens


  can change shape
• function of lens


  controls the amount of refraction of light depending on near or distant focusing
• description of the ciliary muscles


  attached to suspensory ligaments
• function of the ciliary muscles


  change shape of lens
• description of suspensory ligaments

  links ciliary muscles to the lens
• function of the suspensory ligaments


  change shape of lens
• description of retina

  lining at the back of eye
• function of retina

  detects light and send impulses to the brain
• description of optic nerve


  bundle of sensory neurons at back of eye
• function of the optic nerve


  carries impulses from the eye to the brain
• What is myopia 


  Short sightedness
• how can you correct myopia

  Glasses, laser eye surgery, artificial lens
• 2 causes of myopia

  damage to ciliary muscles, elongated eyeball
• impact of a shortened eyeball on eyesight


  hyperopia or long sightedness, focal point behind retina
• pros of artificial lenses


  no need for glasses and better eyesight
• cons of artificial lenses


  intrusive surgery and new technology