Journal of Refractive Surgery

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Original Article 

Vector Analysis of Cross Cylinder LASIK with the NIDEK EC-5000 Excimer Laser for High Astigmatism

Ahmad Shojaei, MD; Medi Eslani, MD; Behzad Elahi, MD; Abbas Abolhassani, MD; Ali Reza Baradaran-Rafiee, MD; Farsad Noorizadeh, MD

  • Journal of Refractive Surgery. 2009;25(12)
  • Posted December 1, 2009

Abstract

Purpose:

To evaluate visual outcomes of LASIK in eyes with high astigmatic refractive errors with low spherical component.

Methods:

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.

Results:

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.

Conclusions:

Cross cylinder LASIK with the NIDEK EC-5000 excimer laser is a successful procedure for correcting high astigmatism and improving vision.

Abstract

Purpose:

To evaluate visual outcomes of LASIK in eyes with high astigmatic refractive errors with low spherical component.

Methods:

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.

Results:

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.

Conclusions:

Cross cylinder LASIK with the NIDEK EC-5000 excimer laser is a successful procedure for correcting high astigmatism and improving vision.

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