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ORIGINAL ARTICLE
Year : 2012  |  Volume : 60  |  Issue : 4  |  Page : 283-287

Analysis of photoastigmatic keratectomy with the cross-cylinder ablation


1 Department of Medicine and Surgery, University of Salerno, Salerno, Italy
2 Eye Department, and Centro Grandi Apparecchiature, 2nd University of Naples, Naples, Italy
3 St Paul's Eye Unit, Royal Liverpool University Hospital, Liverpool, United Kingdom
4 Eye Department, 2nd University of Naples, Naples, Italy
5 Department of Medicine and Ageing Science, Ophthalmic Clinic, University "G. d'Annunzio" of Chieti-Pescara, Italy

Correspondence Address:
Maddalena De Bernardo
Centro Grandi Apparecchiature, 2nd University of Naples, Via De Crecchio 16, 80134 Napoli
Italy
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0301-4738.98707

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Aim: The aim was to evaluate the safety and efficacy of the "cross-cylinder" technique in the correction of astigmatism. Setting and Design: A prospective interventional study from a university eye department was conducted. Material and Methods: The photoastigmatic refractive keratectomy (PARK) using the "cross-cylinder" technique was performed in 102 eyes of 84 patients with at least 0.75 D of astigmatism. The study population was divided into two groups: in the first group the preoperative astigmatic power ranged from −0.75 D to −3.00 D (group 1), in the second group it ranged from −3.25 D to −6.00 D (group 2). Group 1 included 82 eyes of 67 patients (29 males and 38 females) with a mean cylinder power of −1.90 ± 0.63 D, group 2 included 20 eyes of 17 patients (13 males and 4 females) with a mean cylinder power of -4.28 ± 0.76 D. All eyes were targeted for emmetropia. The results were evaluated using Calossi's vector analysis method. Six-month postoperative outcomes are presented. Results: Six months after PARK the mean sphere for the entire cohort was +0.28 ± 0.75 D (range +2.5 to −2 D), the mean cylindrical power was +0.33 ± 0.51 D (range +2.5 to −1.25 D) and the mean spherical equivalent refraction was +0.73 ± 0.81 D (range +1.75 to −2 D). Conclusions: The cross-cylinder technique may be safely used with predictable results for the correction of astigmatism.


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