Isfahan University of Medical Sciences

Science Communicator Platform

Stay connected! Follow us on X network (Twitter):
Share By
The Association Between Residual Astigmatism and Refractive Errors in a Population-Based Study Publisher Pubmed



Hashemi H1 ; Khabazkhoob M1 ; Peyman A2 ; Miraftab M1 ; Jafarzadehpur E1, 3 ; Emamian MH1, 4 ; Shariati M5 ; Fotouhi A6
Authors

Source: Journal of Refractive Surgery Published:2013


Abstract

PURPOSE: To examine the relationship of spherical equivalent (SE) with refractive, corneal, and residual astigmatism. METHODS: Using stratifi ed cluster sampling, 6,311 individuals were invited and 82.2% participated in this study. Examinations including uncorrected and corrected distance visual acuity tests, refraction, slit-lamp examination, and funduscopy were performed for all participants. Refraction and keratometry were used to calculate refractive and corneal astigmatism, respectively, and their difference was regarded as residual astigmatism. RESULTS: Refractive astigmatism showed a U-shaped relationship with SE; with every diopter (D) increase in astigmatism, the SE increased by 0.230 D in hyperopes and 0.664 D in myopes (P < .001). With every 1.0 D increase in residual astigmatism, the SE showed 0.376 D myopic shift in myopes (P = .004) and 0.077 D hyperopic shift in hyperopes (P = .224). Mean SE was highest among cases of with-the-rule (WTR) astigmatism (P < .001). Cases of high myopia and high hyperopia mostly had WTR and most emmetropes had against-the-rule (ATR) refractive astigmatism. Residual astigmatism was mostly WTR in emmetropic cases; at higher levels of SE error in myopes and hyperopes, WTR residual astigmatism decreased, whereas ATR and oblique residual astigmatism increased. CONCLUSIONS: Increases in SE are associated with higher levels of refractive and residual astigmatism among myopic and hyperopic cases. Unlike refractive astigmatism, WTR residual astigmatism was mostly seen in near emmetropic individuals. Copyright © SLACK Incorporated.
Other Related Docs
15. Correlation Between Corneal Thickness and Degree of Myopic Refractory Error, Journal of Research in Medical Sciences (2005)