Bio -eye

• What controls the shape of the lens in the eye?

  Ciliary muscles and suspensory ligaments
• How does the cornea process light?

  It always refracts light by the same amount
• What is the role of the lens in vision?

  It fine-tunes refraction to focus light on the fovea
• What happens to the lens when viewing very close light?

  The lens becomes thicker to refract light more strongly
• What happens to the lens when viewing distant light?

  The lens stretches out and becomes less curved
• What is the function of the suspensory ligaments?

  They attach the lens to the ciliary muscle
• How do ciliary muscles behave when focusing on nearby objects?

  They contract inwards towards the lens
• What happens to the suspensory ligaments when ciliary muscles contract?

  They are no longer pulled tight, allowing lens to thicken
• What is hyperopia?

  Long sightedness where nearby objects appear blurry
• Why do objects appear blurry in hyperopia?

  Light isn't focused by the time it reaches the retina
• How can hyperopia be corrected?

  With glasses that have convex lenses
• What is myopia?

  Short sightedness where distant objects appear blurry
• How can myopia be corrected?

  With glasses that have concave lenses
• Why do distant objects appear blurry in myopia?

  Light is over refracted and focuses before the retina
• What are the differences between hyperopia and myopia?

  • Hyperopia (Long sighted):
  • Can't focus on nearby objects
  • Image appears behind the retina
  • Corrected with convex lenses

  
  

  • Myopia (Short sighted):
  • Can't focus on distant objects
  • Image appears before the retina
  • Corrected with concave lenses
• How do ciliary muscles behave when focusing on distant objects?

  They relax and move away from the lens
• What angle do rays hit the lens when viewing nearby objects?

  At a wide angle
• What happens to the lens when ciliary muscles relax?

  The lens is stretched out and less curved