Format

Send to

Choose Destination
Yonsei Med J. 2015 Jul;56(4):1097-105. doi: 10.3349/ymj.2015.56.4.1097.

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

Author information

1
The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
2
The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.; Department of Ophthalmology, International St. Mary's Hospital, Catholic Kwandong University College of Medicine, Incheon, Korea.
3
The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.; Cornea Dystrophy Research Institute, Department of Ophthalmology, Severance Biomedical Science Institute, and Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.
4
Biostatistics Collaboration Unit, Yonsei University College of Medicine, Seoul, Korea.
5
The Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea. tikim@yuhs.ac.

Abstract

PURPOSE:

To compare the astigmatic power of toric intraocular lenses (IOLs) obtained from the AcrySof, TECNIS, and iTrace toric calculator in patients with preoperative 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 autokeratometry-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 calculator-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.

KEYWORDS:

Astigmatic power; corneal astigmatism; keratometry; toric IOL; toric calculator

PMID:
26069135
PMCID:
PMC4479840
DOI:
10.3349/ymj.2015.56.4.1097
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Yonsei University College of Medicine Icon for PubMed Central
Loading ...
Support Center