Preoperative corneal astigmatism among adult patients with cataract in Northern Nigeria

• Main Authors: Mohammed Isyaku, Syed A Ali, Sadiq Hassan
• Format: Article
• Language: English
• Published: Wolters Kluwer Medknow Publications 2014-01-01
• Series: Indian Journal of Ophthalmology
• Subjects: Fixed corneal compensation; glaucoma; retinal nerve fiber layer; scanning laser polarimetry; Exotropia; recurrence; surgery; Choroid; choroidal thickness; enhanced depth imaging; Cataract; contrast sensitivity function; filter; orange; visual acuity; yellow; High-risk factor; p53; retinoblastoma; Central corneal thickness; diurnal variation; intra-ocular pressure; pseudoexfoliation syndrome; Factors affecting visual outcome in traumatic cataracts; primary posterior capsulotomy; traumatic cataract; visual outcome; Calibration error; calibration; goldmann applanation tonometer; Anterior migration; Ozurdex; posterior chamber; Manuscript preparation; publication; scientific writing; corneal astigmatism; keratometer; Nigeria; toric intraocular lens
• Online Access: http://www.ijo.in/article.asp?issn=0301-4738;year=2014;volume=62;issue=11;spage=1094;epage=1095;aulast=Isyaku
• ISSN: 0301-4738; 1998-3689

The prevalence and nature of corneal astigmatism among patients with cataract has not been well-documented in the resident African population. This retrospective study was undertaken to investigate preexisting corneal astigmatism in adult patients with cataract. We analyzed keratometric readings acquired by manual Javal-Schiotz keratometry before surgery between January 1, 2011 and December 31, 2011. There were 3,169 patients (3286 eyes) aged between 16 and 110 years involved with a Male to female ratio of 1.4:1. Mean keratometry in diopters was K1 = 43.99 and K2 = 43.80. Mean corneal astigmatism was 1.16 diopter and a majority (45.92%) of eyes had astigmatism between 1.00 and 1.99 diopters. Two-thirds of the eyes (66.9%) in this study had preoperative corneal astigmatism equal to or above 1.00 diopter. Findings will help local cataract surgeons to estimate the potential demand for toric intraocular lenses.