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J Refract Surg. 2009 Jan;25(1 Suppl):S89-92.

Photorefractive keratectomy for primary myopia using NIDEK topography-guided customized aspheric transition zone.

Author information

1
Department of Ophthalmology, Istituto Clinico Humanitas, Rozzano, Milan, Italy. info@vincieye.it

Abstract

PURPOSE:

To report the outcomes of topography-guided photorefractive keratectomy (PRK) for the treatment of myopia with or without astigmatism using the customized aspheric transition zone (CATz) ablation algorithm.

METHODS:

In this study, 335 eyes underwent PRK using the NIDEK Advanced Vision Excimer laser platform (NAVEX). Mean preoperative manifest refraction spherical equivalent was -4.42+/-3.46 diopters (D) (range: -14.50 to -0.50 D). Mean preoperative sphere was -3.94+/-3.43 D (range: -13.00 to -1.00 D), and mean preoperative cylinder was -0.96+/-1.05 D (range: -5.50 to 0.00 D). Refractive outcomes out to 1 year postoperatively were analyzed.

RESULTS:

At least 6 months postoperatively, all eyes maintained or gained lines of best spectacle-corrected visual acuity (BSCVA). There was a 51% increase in the eyes that read 20/16 or better uncorrected compared with preoperative BSCVA. At 1 year postoperative, 252/280 (90%) eyes had BSCVA 20/20 or better. Refractive outcomes within +/-0.50 D were observed in 223/275 (81%) eyes at 3 months, 228/300 (76%) eyes at 6 months, and 187/280 (67%) eyes at 1 year.

CONCLUSIONS:

Topography-guided PRK using CATz for the treatment of low, moderate, and high myopia is safe, effective, and predictable.

PMID:
19248534
[Indexed for MEDLINE]

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