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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad del Valle
2008
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| Online Access: | https://www.redalyc.org/articulo.oa?id=28339303 |
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Table of Contents:
- Posterior elevation maps and mean power keratometric maps to evaluate keratoconus and guide Intacs implantation: a step towards improving Intacs nomogram María Ximena Núñez Claudia Blanco Medicina Intacs Cone de centered Cone peak Cone centered Introduction: Keratoconos is a cornea disorder that affects young people and is a contraindication for refractive surgery;it could be treated with contact lens, corneal transplantation or with intracorneal ring segments (Intacs) insertion.Purpose: To compare mean power keratometric maps and posterior elevation maps in delineating keratoconus characteristicsand guide Intacs implantation.Methods: 23 eyes with keratoconus, 12 subjects, cone area, cone radii, cone peak area and coordinates were measuredusing both maps and were compared using t test. Statistical significance was defined as p<0.05. Correlations were assessedwith Pearsons coefficient.Results: Mean cone area was 17.65 mm² ± 4.63 and 35.68 mm² ± 9.72 in posterior elevation map and mean power keratometricanalysis respectively (p 0.00). Both posterior elevation and mean power keratometric maps finds a similar percentage splitbetween centre cones (CC) and de-centered cones (DC) of 78:22. However, 9% cases were found not to match after case tocase evaluation.Conclusion: Based on the cases that not matched the cone centration, we suggest a new way to define the cone centreusing the mean power keratometric map. Therefore, it should be review the decisions to implant symmetric rings vs. asymmetricrings using posterior elevation map. A new parameter is discussed «cone peak centration» in de-centered cones (DC). 2008 artículo científico 0120-8322 https://www.redalyc.org/articulo.oa?id=28339303 en http://www.redalyc.org/revista.oa?id=283 Colombia Médica application/pdf Universidad del Valle Colombia Médica (Colombia) Num.3 Vol.39