TITLE

Comparison of the Astigmatic Power of Toric Intraocular Lenses Using Three Toric Calculators

AUTHOR(S)
Hyun Ju Park; Hun Lee; Young Jae Woo; Eung Kweon Kim; Kyoung Yul Seo; Ha Yan Kim; Tae-im Kim
PUB. DATE
July 2015
SOURCE
Yonsei Medical Journal;Jul2015, Vol. 56 Issue 4, p1097
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Purpose: To compare the astigmatic power of toric intraocular lenses (IOLs) obtained from the AcrySof, TECNIS, and iTrace toric calculator in patients with pre-operative with-the-rule (WTR) or against-the-rule (ATR) corneal astigmatism. Materials and Methods: Fifty eyes with cataract and corneal astigmatism greater than 0.75 diopters were enrolled in each group (WTR and ATR). Keratometric values were measured using autokeratometry, an IOLMaster, and an iTrace, which incorporated corneal topography and ray-tracing aberrometry. Based on measured keratometric values, the astigmatic power of each toric IOL was calculated using three toric calculators. Results: Bland-Altman plots showed good agreement between six pairwise corneal astigmatism values in both groups. The TECNIS calculator tended to suggest a higher astigmatic power of the toric IOL than the AcrySof calculator. With the higher astigmatism and keratometric values from the IOLMaster, in both groups, calculations from the AcrySof and TECNIS calculators resulted in higher calculated astigmatic powers than those from same calculators with autokeratome-try-measured values, demonstrating good agreement. With the higher calculated astigmatic power values, the values from the iTrace toric calculator using keratometric values obtained from iTrace ray tracing wavefront aberrometry or iTrace simulated keratometry showed fair to moderate agreement with those from the other calcula-tor-keratometry pairs in both groups. Conclusion: To achieve the best refractive outcome after toric IOL implantation, understanding the differences in keratometric values between instruments and in calculated astigmatic power among toric calculator programs is necessary. Moreover, systemic analysis of each toric calculator in conjunction with postoperative data is required.
ACCESSION #
103285604

 

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