Intrastromal corneal ring segment implantation to correct astigmatism after penetrating keratoplasty

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• 作者：Sandro Coscarelli ; MD ; Guilherme Ferrara ; MD ; ^{guilherme@ferrararing.com.br} ; Jose F. Alfonso ; MD ; PhD ; Paulo Ferrara ; MD ; PhD ; Jesú ; s Merayo-Lloves ; MD ; PhD ; Luana P.N. Araú ; jo ; MD ; Aydano P. Machado ; PhD ; Joã ; o Marcelo Lyra ; MD ; PhD ; Leonardo Torquetti ; MD ; PhD
• 刊名：Journal of Cataract and Refractive Surgery
• 出版年：2012
• 期刊代码：145_08863350
• 类别：med
• 出版时间：June, 2012
• 卷：38
• 期：6
• 页码：1006-1013
• 文件大小：665 K

摘要

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Purpose

To evaluate the clinical outcomes of implantation of Ferrara intrastromal corneal ring segments (ICRS) in patients with astigmatism after penetrating keratoplasty (PKP).

Setting

Private clinic, Belo Horizonte, Brazil.

Design

Retrospective consecutive case series.

Methods

Chart records of post-PKP patients who had ICRS implantation from May 2005 to September 2009 were retrospectively reviewed. The following parameters were studied: corrected distance visual acuity (CDVA), keratometry (K) values, spherical equivalent (SE), spherical refractive error, corneal topographic astigmatism, minimum K, and maximum K.

Results

The study evaluated 59 eyes (54 patients). The mean CDVA (logMAR) improved from 0.45 卤 0.17 (SD) (range 0.18 to 1.00) to 0.30 卤 0.17 (range 0.00 to 1.00). The mean SE was 鈭?.34 卤 3.40 diopters (D) (range 0.37 to 鈭?6.50 D) preoperatively and 鈭?.66 卤 2.52 D (range 0.87 to 鈭?0.50 D) postoperatively. The mean spherical refractive error decreased from 鈭?.10 卤 3.07 D (range 2.15 to 16.68 D) preoperatively to 鈭?.46 卤 2.05 D (range 0.88 to 10.79 D) postoperatively. No patient lost visual acuity. The mean corneal topographic astigmatism decreased from聽3.37 卤 1.51 D preoperatively to 1.69 卤 1.04 D postoperatively. The mean maximum K聽value聽decreased from 48.09 卤 2.56 D to 44.17 卤 2.67 D and the mean minimum K value, from 44.90 卤 2.54 D to 42.46 卤 2.63 D. All changes were statistically significant (P<.0001).

Conclusion

Intrastromal corneal ring segments effectively reduced corneal cylinder in patients with astigmatism after PKP.

Financial Disclosure

Drs. Ferrara and Merayo-Lloves have proprietary interest in the Ferrara ring. Drs. Coscarelli, Torquetti, and Alfonso have no financial or proprietary interest in any material or method mentioned.