To evaluate the change in the anterior corneal asphericity (Δ) comprehensively calculated using the tangential radius () after LASIK. Forty-two right eyes were evaluated using the Orbscan II corneal topographer. The pre- and postoperative -values of the flat principal semimeridians calculated by the sagittal radius were compared to those by the tangential radius. The -value of each semimeridian in the horizontal region was calculated by . Fourier fitting was used to model the 360-semimeridional variation of -values and to fit the -values in the vertical region before and after surgery. There were significant differences in -values between the two methods before () and after surgery (). A significant increase in postoperative -value was detected compared to preoperative -value () calculated by . The 360-semimeridional variation of the -values was well fitted with a third- and fourth-degree Fourier function before and after surgery. The Δ-value distribution presented double valley variation, with the amount of Δ being lowest in the near-vertical regions and highest in the near-horizontal regions. Calculating the -value with combined with Fourier fitting, we evaluated 360 Δ-values’ variation of semimeridians of the entire anterior corneal surface and then displayed true and complete anterior corneal shape after LASIK.
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