title: Prevalence of corneal astigmatism before cataract surgery.
abstract: The purpose of this study was to describe and analyze the prevalence and pattern of corneal astigmatism in cataract surgery candidates. In a prospective cross-sectional study, preoperative demographics, and keratometric and refractive values of cataract surgery candidates were collected from January 2013 to December 2014. Axial length (AL) and flat and steep keratometry measurements were optically measured by a partial coherence interferometry device (IOLMaster). This study consisted of 2156 eyes of 1317 patients with a mean age of 64.92 ± 11.48 (SD) (30-88 years). The mean of AL was 23.33 ± 1.37 mm, and the mean of corneal astigmatism was 1.12 ± 1.10 diopter (D) (range 0.0-7.00), in all patients. Furthermore, the mean of flat and steep keratometry were 43.70 ± 1.70 and 44.83 ± 1.79 D, respectively. Corneal astigmatism was 1.50 D or less in 1590 eyes (73.7 %), more than 1.50 D in 566 eyes (26.2 %), 3.00 D or more in 161 eyes (7.4 %), WTR in 796 eyes (36.9 %), ATR in 1010 eyes (46.8 %), and oblique in 350 eyes (16.2 %). ATR astigmatism axis significantly increased with the increase in age. Corneal astigmatism of most cataract surgery candidates fell between 0.50 and 1.50 D. The results of our study however is confined to our demographics might provide useful data for cataract patients, surgeons, and intraocular lens manufacturers for different purposes.
authors.affiliation: AJA University of Medical Sciences, Fatemi ave, 1483659342, Tehran, Iran.
authors.forename: Mehran
authors.initials: M
authors.lastname: Mohammadi
authors.affiliation: School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Naderan
authors.affiliation: School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
authors.forename: Rozhin
authors.initials: R
authors.lastname: Pahlevani
authors.affiliation: AJA University of Medical Sciences, Fatemi ave, 1483659342, Tehran, Iran. alijahanrad@gmail.com.
authors.forename: Ali
authors.initials: A
authors.lastname: Jahanrad
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000453:epidemiology*; D058452:Axial Length, Eye; D002387:Cataract Extraction; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D057234:Preoperative Period; D015995:Prevalence; D011446:Prospective Studies
keywords: Cataract surgery; Corneal astigmatism; IOLMaster; Iran; Partial coherence interferometry; Prevalence