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Adriano B. carneiro, Sr., Cristina Carossa, Sr., Augusto Paranhos, Sr., Claudio L. Lottenberg, Sr.; Correlation Between the Corneal Curvature and Improvement in Visual Acuity After Intrastromal Corneal Rings Implantation with Intralase for Keratoconus. Invest. Ophthalmol. Vis. Sci. 2011;52(14):5165.
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To evaluate the relations between pre operatory topografic and aberrometric findings and the post operative outcomes in patients with Keratoconus treated with Intrastromal rings (kerarings) implanted with Intralase.
To evaluate the association between the change of visual acuity in logMAR after the procedure and the following independent variables: Kmax, Vertical Coma and spherical aberration (before treatment), generalized estimating equation (GEE) models were performed to account for the dependence between eyes. In a cumulative logit GEE model, success defined as Mean Toric Keratometry (TKM) equal or less then 48 diopters and the same independent variables of the fist model were tested.
This study evaluate 18 eyes of 15 patientes with a mean age of 29 ± 10 years. The mean interval between pre and post operative examinations was 72 ± 48 days. The mean pre operative curvature (Kmax) was 51,65 ± 2,80 D and the Mean pre op TKM was 52.51 ± 3.59. The post operative values decreased after Keraring implantation (-7.91 ± 12.36) with a improvement in post operative CDVA pre from 0.74 ± 0.66 to 0.43 ± 0.29 ( difference -0.38 ± 0.56). There was a inverse correlation (Wald Chi-Square P<0,005) between the K Max and the improvement is CDVA while no significant correlation was found in pre op vertical coma -2.57 ± 1.74 or spherical aberration -0.60 ± 0.73. None of the tested variables were significantly associated with the TKM definition of success.
The K max had a inverse correlation with the visual outcome after keraring implantation indicating limitations in patients with high pre operative values of keratometry as predictor for poor results.
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