Original articleAxis Difference Between Corneal and Internal Astigmatism to Consider for Toric Intraocular Lenses
Section snippets
Study Population
This retrospective cross-sectional study included 180 eyes from 180 consecutive patients who underwent cataract surgery with implantation of an IOL at our institute between May 24, 2011 and May 30, 2012. Patients whose corneal and internal astigmatism could be measured using a wavefront analyzer (KR-1W; Topcon, Tokyo, Japan) were included. Patients with best-corrected visual acuities (BCVA) less than 20/40 in the operated eye after cataract surgery, prior ocular surgery (such as pars plana
Results
A total of 180 eyes from 180 patients who underwent uncomplicated cataract extraction with implantation of an IOL in the bag were included in this study. Of the 180 patients, 61 were men and 119 were women. The mean (± SD) age was 66.1 (± 10.6) years (range, 39-93 years). The laterality, mean preoperative corneal power, anterior chamber depth, axial length, and predicted refraction are given in Table 1.
The mean cylinder power and J0, and J45 components for the preoperative refractive, corneal,
Discussion
The present study tried to evaluate the axis difference between corneal and internal astigmatism in patients with cataract. Corneal and internal astigmatic vector showed a tendency to have opposite directions. Corneal astigmatism can be reduced by several surgical techniques at the time of cataract surgery. It is important to select the proper patients who can be satisfied with these surgical techniques by reducing corneal astigmatism. Patients who have an opposite-axis difference between their
Youngsub Eom, MD, is a clinical instructor of the Department of Ophthalmology at the Korea University College of Medicine. Dr Eom graduated from Korea University Medical School in 2007, where he completed his ophthalmology residency in 2012. His special interests are optics, visual function and cataract and refractive surgery.
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Youngsub Eom, MD, is a clinical instructor of the Department of Ophthalmology at the Korea University College of Medicine. Dr Eom graduated from Korea University Medical School in 2007, where he completed his ophthalmology residency in 2012. His special interests are optics, visual function and cataract and refractive surgery.
Jong-Suk Song, MD, PhD is an associate professor at the Department of Ophthalmology, Korea University College of Medicine, Seoul, South Korea. He is currently Secretary of the Korean Society of Cataract and Refractive Surgery (KSCRS). His research interests include corneal endothelium, ocular imaging, phakic IOL and premium IOL.