Cornea Topography

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Cornea Topography

  1. 1. Cornea and Cornea TopographyWith Bausch and Lomb OrbscanIIz<br />
  2. 2. 5 Layers of Cornea<br />Epithelium<br />Bowman’s Membrane<br />Stroma<br />Descemet’s Membrane<br />Endothelium<br />
  3. 3. Epithelium<br />Provides Protection <br />Provides a smooth surface so that nutrients and oxygen can transfer to the cornea.<br />A lot of nerve endings<br />
  4. 4. Bowman’s Membrane<br />Composed of strong collagen tissue<br />Helps to maintain the cornea’s shape<br />Helps anchors down the epithelium <br />
  5. 5. Stroma<br />Contains mostly of water and protein<br />The alignment of collagen fibers help the cornea retain its clarity. <br />
  6. 6. Descemet’s Membrane<br /><ul><li>Filters out infections and disease
  7. 7. Helps with the stroma in maintaining the rigid shape of the cornea </li></li></ul><li>Endothelium<br />Helps pumps fluid out of the Stroma<br />
  8. 8. Corneal Topography<br />3D view of Cornea<br />Aids in diagnosis various cornea conditions and disease<br />Used in Laser Refractive Surgeries <br />
  9. 9. K Readings<br />Measures is Diopters<br />K< 41D is consider flat<br />K>46D is consider Steep<br />K>41 but <46 is consider average<br />Important in determining LASIK <br />K readings are also used in IOL Master to calculate IOL’s<br />
  10. 10. Anterior Map<br />
  11. 11. Posterior Map<br />
  12. 12. Keratometric Map<br />
  13. 13. Regular Astigmatism<br />
  14. 14. Irregular Astigmatism<br />
  15. 15. Pachemetry Map<br />
  16. 16. Normal Topography<br />
  17. 17. Abnormal Topography<br />
  18. 18. Abnormal Topography<br />
  19. 19. Keratoconus<br />Abnormal Cornea condition where the cornea protrudes out more; Instead of a Dome like Figure, it becomes like a cone<br />Distorts and reduces vision<br />Usually bilaterally but asymmetrical <br />Usually Myopic with large amounts of Irregular astigmatism<br />No corneal refractive surgeries can be done<br />As the cornea steepens, the cornea pachemtry gets thinner<br />
  20. 20. Keratoconus cont…<br />
  21. 21. 3D Anterior Map of KC<br />
  22. 22. 3D Posterior Map of KC<br />
  23. 23. How to take Topographies<br />Have the patient sit at a comfortable level<br />Inform the patient on what test you are doing<br />Try to have a good tear film<br />Let the patient know they cannot move doing this test<br />
  24. 24. Demonstration of Topography<br />
  25. 25. How to take Pachs with Ultrasound<br />Always have pt look at a fixation point<br />Carefully touch the central cornea with tip<br />Try not to indent the cornea<br />Always get a consistent reading<br />
  26. 26. Demonstration of US Pachs<br />
  27. 27. Keep in your head<br />Consistency is the answer<br />Knowing what is normal and abnormal<br />Good tear film<br />Being comfortable with the machine will make the patient more comfortable with you<br />When in doubt always ask<br />

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