Preoperative corneal astigmatism among adult patients with cataract in Northern Nigeria

Abstract

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.

Keywords

• 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
• glaucoma
• 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
• Cataract
• corneal astigmatism
• keratometer
• Nigeria
• toric intraocular lens