To evaluate visual outcomes of LASIK in eyes with high astigmatic refractive errors with low spherical component.
We prospectively evaluated cross cylinder LASIK in patients with high astigmatic eyes with low spherical component over a 2-year period. All laser surgeries were performed with the NIDEK EC-5000 excimer laser. We used power vectors (M [spherical equivalent] and J0, and J45 [cylinder]) to analyze the astigmatic results. Main outcome measures were uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), manifest refraction, and complications.
Thirty-four eyes of 22 patients were included. Patients were followed for 21.8 ± 3.7 months. At the last examination, UCVA of 20/40 or better was observed in 33 (97.1%) eyes. Best spectacle-corrected visual acuity after LASIK improved significantly in comparison to BSCVA before surgery (P < .005). Mean preoperative cylinder was -4.73 ± 0.89 diopters (D) (range: -4.00 to -7.00 D), which decreased to -0.29 ± 0.47 D (range: 0.00 to -1.50 D) at last follow-up (P < .001). Reduction in the magnitude of power vectors was 92.4% for M, 103.2% for J0, and 76.4% for J45. No cases of post-operative astigmatic regression or corneal haze were observed.
Cross cylinder LASIK with the NIDEK EC-5000 excimer laser is a successful procedure for correcting high astigmatism and improving vision.