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Clinical evaluation of toric intraocular lens implantation based on iTrace wavefront keratometric astigmatism

Authors :
Zhe Zhang
Hui Li
Jing Zhou
Yaqin Zhang
Suhua Zhang
Source :
BMC Ophthalmology, Vol 20, Iss 1, Pp 1-9 (2020)
Publication Year :
2020
Publisher :
BMC, 2020.

Abstract

Abstract Background Currently, there is no standard technique for determining corneal astigmatism. The iTrace wavefront aberrometry of cornea calculated steep power and axis based on the best Zernike mathematical fit from all topo data within 4 mm circle. It was supposed to be more accurate than iTrace simulated keratometry which was calculated based on only 4 points on the circle of 3 mm. This aim of this study was to evaluate visual outcomes and rotational stability after toric intraocular lens (IOL) implantation using the wavefront aberrometry of the cornea with iTrace. Setting: Single site in China, Shanxi Eye Hospital, Shanxi, China. Design: Prospective case series. Methods The study included 85 eyes of 63 patients undergoing phacoemulsification and toric IOL implantation. The IOL power and cylinders were chosen with the help of the iTrace toric planning program using wavefront keratometric astigmatism. Astigmatic changes were assessed using Alpins vector method over a 3-month follow-up period. Results Preoperative mean corneal topographic astigmatism was 1.91 diopters (D) ± 0.69 (standard deviation). Postoperative mean refractive astigmatism decreased significantly to 0.48 D ± 0.34. Surgical induced astigmatism was 1.73 D ± 0.77 and the mean correction index was 0.89 ± 0.22, showing a slight undercorrection. The proportion of astigmatism ≤0.50 D increased from 0 to 71.8% postoperatively. Conclusions This is the first study on evaluation of clinical outcomes of toric IOL implantation in corneal astigmatism patients using iTrace wavefront keratometric readings. The findings show that use of iTrace built-in toric calculator is safe and effective for planning toric IOL surgery for wavefront keratometric astigmatism. Trial registration Current Controlled Trials ISRCTN94956424 , Retrospectively registered (Date of registration: 05 February 2020).

Details

Language :
English
ISSN :
14712415
Volume :
20
Issue :
1
Database :
Directory of Open Access Journals
Journal :
BMC Ophthalmology
Publication Type :
Academic Journal
Accession number :
edsdoj.b28b730ce0bc45918add31fab77c2b3b
Document Type :
article
Full Text :
https://doi.org/10.1186/s12886-020-01726-0