Abstract
Purpose To examine the magnitude, orientation, and age-related changes of corneal astigmatism of the eyes before cataract surgery. Setting. Hebei Eye Hospital, Hebei, China. Design A clinical-based retrospective study. Results The study consisted of 5662 eyes of 5662 consecutive cataract surgery patients with a mean age of 68.26 ± 10.39 (mean ± standard deviation (SD)) years (range 40 to 97 years), and 59.86% of the patients were women. Mean corneal astigmatism was 0.98 ± 0.76 diopter (D) (range 0.00–9.61 D). Corneal astigmatism of 0.50–0.99 D was the most common range of values (30.08%), followed by 1.00–1.49 D (22.15%), ≤0.50 D (21.21%), and 1.50–1.99 D (10.28%). There was a strong U-shaped relation between corneal astigmatism and age (p for nonlinearity <.01). With the increase of age, the astigmatism axis gradually changes from with-the-rule (WTR) to against-the-rule (ATR). Moreover, in young patients with age below 65 years, WTR astigmatism was negatively correlated with age, while ATR was positively correlated with age (r = −0.11, p=.001; r = 0.10, p=.010, respectively). However, in the old patients with age above and equal to 65 years, all types of astigmatism were positively correlated with age. Conclusion This study may provide valuable and practical information to surgeons when selecting the appropriate surgical method and toric intraocular lens (IOLs).
Highlights
Cataract is the leading cause of blindness worldwide, and it is one of the most frequently performed surgeries globally
Corneal astigmatism is a major concern in modern cataract surgery, which provides a unique opportunity for the surgeon to address the issue of corneal astigmatism before surgery, in order to achieve the desired postoperative visual quality. e common techniques to treat corneal astigmatism during cataract surgery include incisions on the steep axis, peripheral cornealrelaxing incisions (PCRIs), toric intraocular lens (IOLs), or their combinations [1,2,3]
Data Collection. e medical and systematic histories of the patients were reviewed. e patient underwent a comprehensive eye examination, including slit lamp biomicroscopy, applanation tonometry and fundus ophthalmoscopy through dilated pupils. e data points extracted for the study included age, sex, and the magnitude and orientation of corneal astigmatism
Summary
Cataract is the leading cause of blindness worldwide, and it is one of the most frequently performed surgeries globally. Its goal has changed from improving visual acuity to providing optimal vision and minimizing postoperative spectacle dependence [1]. Corneal astigmatism is a major concern in modern cataract surgery, which provides a unique opportunity for the surgeon to address the issue of corneal astigmatism before surgery, in order to achieve the desired postoperative visual quality. The cataract patients were mainly from a single hospital, and the results do not completely represent the data of the whole population in their regions. Our goal was to examine the magnitude, orientation, and age-related changes of corneal astigmatism of the eyes before cataract surgery in northern Chinese patients
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