Refractive Disorders

• Hyperopia

  • Sight: Far-sighted
  • Shape of the eyeball: Short
  • Focus: Behind the lens or retina
  • Refractive ability/lens: Weak
  • Corrective lens: Positive (+)
  • Shape of Corrective lens: Convex
• Myopia

  • Sight: Near-sighted
  • Shape of the eyeball: Long
  • Focus: In front of the lens
  • Refractive ability/lens: Strong
  • Corrective lens: Negative (-)
  • Shape of Corrective lens: Concave
• Astigmatism

  • Sight: Blurry both near and distant vision
  • Shape of the eyeball: Irregular
  • Curvature: Too much
  • Focus: Behind and in front the lens
  • Refractive ability/lens: Abnormal shape
  • Corrective lens: Soft toric lens
  • Shape of Corrective lens: Cylindrical
• Presbyopia

  • Sight: Far-sighted
  • Due to: Aging
  • Shape of Corrective lens: Convex
• Presbyopia is loss of accommodation due to hardening of the lens