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PJ Chastang, H Faraj, D Gatinel, O Prisant, T Hoang-Xuan; Changes of Corneal Asphericity after Hyperopic LASIK . Invest. Ophthalmol. Vis. Sci. 2002;43(13):168.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To study the change in asphericity of the cornea after hyperopic LASIK performed with the Nidek EC-5000. Method: 25 hyperopic LASIK cases were included. Preoperative and three months postoperative values of axial simulated keratometry, axial central power (ACP), effective refractive power (EffRP), and corneal asphericity (Q) were recorded using the EyeSys 2000 videokeratoscope. Subjective refraction with cycloplegia was performed before and after surgery. Results: Mean preoperative and postoperative spherical equivalent (SE) were respectively 3.66 +/- 1.59 D and 0.46 +/- 075 D. Preoperative and postoperative Q values were respectively -0.16 +/- 0.10 and -0.68 +/- 0.55. Q value changes significantly correlated (p<0.05) with preoperative SE (r=-0.57), preoperative asphericity (r=-0.74), changes in SE (r=0.69), ACP (r=-0.78) and EffRP (r=-0.71) induced by LASIK. Conclusion: The cornea becomes more prolate after hyperopic LASIK. The change in asphericity correlates with the magnitude of treatment.
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