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. 2014:2014:536412.
doi: 10.1155/2014/536412. Epub 2014 Jun 3.

Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China

Xiaoyong Yuan  1 , Hui Song  1 , Gang Peng  2 , Xia Hua  1 , Xin Tang  1
Affiliations

Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China

Xiaoyong Yuan et al. J Ophthalmol. 2014.

Abstract

Purpose. To analyze the prevalence and presentation patterns of corneal astigmatism in cataract surgery candidates in a teaching hospital in northern China. Methods. From May 1, 2012, to April 30, 2013, partial coherence interferometry (IOLMaster) measurements of all qualified cataract surgery candidates were retrospectively collected and analyzed. Results. The study evaluated 12,449 eyes from 6,908 patients with a mean age of 69.80 ± 11.15 (SD) years. The corneal astigmatism was 0.5 diopters (D) or less in 20.76% of eyes, 1.0 D or more in 47.27% of eyes, 2.0 D or more in 13.16% of eyes, and 3.0 D or more in 3.75% of eyes. With-the-rule astigmatism was found in 30.36% of eyes, while against-the-rule was found in 52.41% of eyes. The percentage of against-the-rule astigmatism increased with age. Conclusion. Our study showed that almost one-half of preoperative eyes (47.27%) in northern China have a corneal astigmatism of 1.0 D or more, indicating that more surgical techniques or toric IOLs are needed to achieve better visual rehabilitation.

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Figures

Figure 1
Figure 1
Distribution of corneal astigmatism in 0.5 D increments for all 12,449 eyes.
Figure 2
Figure 2
Corneal cylinder in all 7 age groups. The bold lines in the boxes represent the median (50% percentile), the upper and lower limits of the box represent the first quartile (25% percentile) and third quartile (75% percentile), and the bars represent the minimum and maximum values.
Figure 3
Figure 3
Frequency distribution of corneal astigmatism in 0.50 D steps for the 7 age groups.
Figure 4
Figure 4
Percentages of WTR, ATR, and oblique corneal astigmatisms in the 7 groups.
See this image and copyright information in PMC

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