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A. Takada, N. Maeda, T. Kuroda, S. Ninomiya, T. Fujikado, Y. Tano, Y. Hirohara, T. Mihashi; Effect of Axes of Measurements on Ocular and Corneal Higher-order Aberrations in Patients Following LASIK . Invest. Ophthalmol. Vis. Sci. 2003;44(13):2549.
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Purpose:To investigate the effect of the axes of measurements on ocular and corneal higher-order aberrations in patients following LASIK. Methods:The corneal topography and wavefront sensing of 30 eyes of 15 patients were determined with the KR-9000PW (Topcon, corp., Japan) before and after conventional LASIK for myopia. Ocular and corneal higher-order aberrations were calculated for a 6 mm diameter pupil aligned on the line of sight or on the vertex normal. The difference between the line of sight and the vertex normal were studied for coma-like, spherical-like, and total higher-order aberrations. Results: For ocular higher-order aberrations, there were no significant differences in coma-like, spherical-like, or total higher-order aberrations between the two axes of measurement before LASIK. After surgery, however, there was a significant difference in ocular spherical-like aberration between the line of sight ( 0.59 ± 0.16 µm, RMS) and the vertex normal (0.61 ± 0.18 µm, P=0.03, paired t-test). For corneal higher-order aberrations, the total higher-order aberrations after LASIK were significantly different between the line of sight (1.14 ± 0.44 µm) and the vertex normal (1.00 ± 0.27 µm, P=0.008, paired t-test). There were also significant differences between the two axes for coma-like aberrations after surgery and for coma-like and spherical-like aberrations before surgery. Conclusions:Although corneal topography was measured along the vertex normal and the wavefront error along the line of sight, ocular and corneal higher-order aberrations should be described based on a common axis to evaluate the characteristics of the higher-order aberrations following LASIK.
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