How the Eye Works, Accommodation #32

• What is the process of accommodation in the eye?

  It changes the lens's refractive power
• Why is accommodation important for vision?

  It allows seeing both near and distant objects
• What parts of the eye are important for accommodation?

  Cornea and lens
• What role do the ciliary muscles and suspensory ligaments play?

  They control the shape of the lens
• Where must light be focused in the eye?

  On the fovea of the retina
• How does the cornea contribute to vision?

  It refracts light consistently
• What is the lens's role in focusing light?

  It fine-tunes the refraction of light
• How does the lens change shape for nearby objects?

  It becomes short and fat
• What happens to the ciliary muscle when focusing on nearby objects?

  It contracts and moves inward
• What occurs to the suspensory ligaments when the ciliary muscle contracts?

  They slacken and become loose
• How does the lens adjust for distant objects?

  It stretches out to reduce curvature
• What is the effect of the ciliary muscle relaxing?

  It pulls the suspensory ligaments taut
• What happens when the lens cannot refract enough light?

  It results in long-sightedness
• What is the medical term for long-sightedness?

  Hyperopia
• How do glasses help long-sighted individuals?

  They contain convex lenses for extra refraction
• What occurs when the lens refracts too much light?

  It results in short-sightedness
• What is the medical term for short-sightedness?

  Myopia
• How do glasses assist short-sighted individuals?

  They contain concave lenses to reduce refraction
• What are the key components of the accommodation process?

  • Ciliary muscles contract or relax
  • Suspensory ligaments adjust tension
  • Lens changes shape (fat for near, flat for far)
  • Cornea refracts light consistently
• What are the differences between hyperopia and myopia?

  • Hyperopia (long-sightedness):
  • Can see distant objects clearly
  • Difficulty focusing on nearby objects
  • Corrected with convex lenses
  • Myopia (short-sightedness):
  • Can see nearby objects clearly
  • Difficulty focusing on distant objects
  • Corrected with concave lenses