Accommodation (Eye)

• What is accommodation in the eye?

  Accommodation is the process by which the lens changes shape to focus on near or distant objects by adjusting its curvature
• How does the eye focus on a near object (e.g., reading a book)?

  • Ciliary muscles contract
  • Suspensory ligaments loosen
  • Lens becomes thicker and more curved (to refract light more)

  
• How does the eye focus on a distant object (e.g., looking at a road sign)?

  • Ciliary muscles relax
  • Suspensory ligaments tighten
  • Lens becomes thinner and less curved (to refract light less)

  
• Why does the lens need to change shape for accommodation?

  • Light from near objects diverges more, so the lens thickens to bend it more
  • Light from distant objects diverges less, so the lens thins to bend it less.
• What happens if the lens cannot adjust properly?

  The person may have myopia (short-sightedness) or hyperopia (long-sightedness), which require corrective lenses.