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J. N. Nam, G. Pamel, A. J. Kanellopoulos, H. D. Perry; Comparison of Topography-Guided Lasik (tgl) to Standard Lasik (sl) for Hyperopia: Is It Important to Adjust for Angle Kappa?. Invest. Ophthalmol. Vis. Sci. 2008;49(13):3356.
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Alignment errors during photoablation lead to decentration and nonhomogenous ablation patterns. Thus, proper centration of the ablation zone during refractive procedures is an essential goal. In this study, we compared the safety and efficacy of TGL versus SL in hyperopes. We evaluated the effect of adjusting for angle kappa in LASIK treatments.
35 patients were treated with topography-guided LASIK in one eye and standard LASIK in the other. The Wavelight and Intralase systems were used. Refraction, UCVA, BSCVA, angle kappa, effective ablation diameter (EAD), wavefront analysis (WA) and contrast sensitivity (CS) were evaluated up to 18 months post-operatively. All laser treatments were conducted at the Laservision Institute in Athens, Greece.
TGL: The mean UCVA improved from 20/48 (SD+/-0.23) pre-operatively to 20/23 (SD+/- 0.173) post-operatively. 69% of eyes were within +/- 0.50 D of the refractive goal. None of the eyes lost more than 1 line of BSCVA. The mean regression between months one and 3 for TGL and SL was +0.32 D and +0.55 D respectively. The relative deviation from the ablation center to the optical axis center was 0.5mm.
Ou studies demonstrate that TGL and SL are safe and effective methods for treating hyperopia. TGL with correction of angle kappa appears to be superior in regard to regression, residual astigmatism and effective ablation diameter.
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