Myopia

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A simple presentation describing the different causes, features and treatment techniques of myopia. Accompanied with pictures showing the different signs found on examination

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Myopia

  1. 1. Saad Bin Zafar Mahmood
  2. 2. 43 diopters 24-25mm 18 diopters Accomodation at rest
  3. 3.  A form of refractive error in which parallel rays of light entering the eye are focused in front of retina with accomodation being at rest
  4. 4.  Curvature Axial length Refractive index Positional
  5. 5.  Congenital Simple Degenerative
  6. 6.  Unilateral / Bilateral Stationary Associated with convergent squint
  7. 7.  Most common refractive error Age of onset Moderate severity No degenerative changes
  8. 8.  Progressive in nature Age of onset Severe Hereditary in nature
  9. 9. Degenerative Increase in axialchanges length ofin sclera eyeball Changes Elongation in choroid and stretching and retina of sclera DECREASE VISION
  10. 10.  Macular hemorrhage Posterior staphyloma Retinal detachment Glaucoma
  11. 11.  Distant blurred vision Half shutting of eyes Divergent squint
  12. 12.  Prominent eyeballs Anterior chamber is deep Ultrasongraphy Fundus examination
  13. 13.  Concave lenses ◦ Children ◦ Adults Contact lenses
  14. 14.  Cornea For high refractive errors ◦ Clear Lens extraction ◦ Phakic posterior chamber implant
  15. 15.  Radial Keratotomy ◦ Radius of the curvature of cornea is reduced (flattened) ◦ Series of radial incisions in peripheral cornea ◦ Can correct upto 4 diopters ◦ Less popular these days due to PRK and LASIK
  16. 16.  Photorefractive keratectomy ◦ Laser procedure ◦ Central corneal surface is ablated ◦ Results in flattening of cornea ◦ A 10um ablation corrects a 1 dipotre of myopia
  17. 17. Step 1 Step 3Step 2 Step 4
  18. 18.  Absence of post-operative pain Less haze Rapid recovery
  19. 19.  Hybrid of PRK and LASIK It involves separation of epithelium Difference with LASIK is the thickness of epithelium

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