Journal of Refractive Surgery

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Original Article 

Topography-guided Custom Ablation for Irregular Corneal Astigmatism Using the NIDEK NAVEX Laser System

Yoko Yoshida, MD; Tomoaki Nakamura, MD; Norihiko Yoshida, MD; Shuya Hara, MD; Takashi Kojima, MD; Kazuo Ichikawa, MD

Abstract

PURPOSE

To determine whether topography-guided custom ablation produces acceptable outcomes in the treatment of irregular corneal astigmatism caused by previous corneal surgery or corneal disease.

METHODS

Thirteen eyes of nine patients who had irregular corneal astigmatism from previous corneal surgery or corneal disease were treated with customized aspheric treatment zone (CATz) ablations using the NIDEK Advanced Vision Excimer Laser System (NAVEX). Changes in corneal surface regularity index, surface asymmetry index, asymmetry component, corneal and ocular higher order aberrations, uncorrected visual acuity, and best spectacle-corrected visual acuity (BSCVA) were analyzed using Wilcoxon and paired t tests. A P value <.05 was="" considered="" statistically="">

RESULTS

After CATz treatment, 62% of eyes (8 of 13) showed an increase in BSCVA. Improvements in both the surface asymmetry index and asymmetry components were statistically significant after CATz treatment (P<>

CONCLUSIONS

Topography-guided custom ablation can be safe and effective in the management of irregular corneal astigmatism due to previous corneal surgery or corneal disease. [J Refract Surg. 2008;24:24-32.]

ABOUT THE AUTHORS

From the Nagoya Eye Clinic (Y. Yoshida, Nakamura), and the Department of Ophthalmology, Chukyo Hospital (Hara, N. Yoshida, Kojima, Ichikawa), Nagoya, Aichi, Japan.

The authors have no proprietary interest in the materials presented herein.

Correspondence: Yoko Yoshida, MD, Nagoya Eye Clinic, 3F Meitetsu-Kanayama-Daiichi-Bldg, 25-1 Namiyose-cho, Atuta-ku, Nagoya, Aichi, 456-0003, Japan. Tel: 052 872 0490; Fax: 052 872 0491; E-mail: lasik@aqua.ocn.ne.jp

Received: October 16, 2006

Accepted: September 5, 2007

Posted online: September 28, 2007

Abstract

PURPOSE

To determine whether topography-guided custom ablation produces acceptable outcomes in the treatment of irregular corneal astigmatism caused by previous corneal surgery or corneal disease.

METHODS

Thirteen eyes of nine patients who had irregular corneal astigmatism from previous corneal surgery or corneal disease were treated with customized aspheric treatment zone (CATz) ablations using the NIDEK Advanced Vision Excimer Laser System (NAVEX). Changes in corneal surface regularity index, surface asymmetry index, asymmetry component, corneal and ocular higher order aberrations, uncorrected visual acuity, and best spectacle-corrected visual acuity (BSCVA) were analyzed using Wilcoxon and paired t tests. A P value <.05 was="" considered="" statistically="">

RESULTS

After CATz treatment, 62% of eyes (8 of 13) showed an increase in BSCVA. Improvements in both the surface asymmetry index and asymmetry components were statistically significant after CATz treatment (P<>

CONCLUSIONS

Topography-guided custom ablation can be safe and effective in the management of irregular corneal astigmatism due to previous corneal surgery or corneal disease. [J Refract Surg. 2008;24:24-32.]

ABOUT THE AUTHORS

From the Nagoya Eye Clinic (Y. Yoshida, Nakamura), and the Department of Ophthalmology, Chukyo Hospital (Hara, N. Yoshida, Kojima, Ichikawa), Nagoya, Aichi, Japan.

The authors have no proprietary interest in the materials presented herein.

Correspondence: Yoko Yoshida, MD, Nagoya Eye Clinic, 3F Meitetsu-Kanayama-Daiichi-Bldg, 25-1 Namiyose-cho, Atuta-ku, Nagoya, Aichi, 456-0003, Japan. Tel: 052 872 0490; Fax: 052 872 0491; E-mail: lasik@aqua.ocn.ne.jp

Received: October 16, 2006

Accepted: September 5, 2007

Posted online: September 28, 2007

10.3928/1081597X-20080101-04

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