Abstract
Purpose:
To determine the prevalence of corneal astigmatism in a cataract population to aid cataract surgeons with their options for correcting astigmatism and assess the demand for toric intraocular lenses.
Methods:
Keratometric data was collected for all patients who attended for routine cataract surgery at two different sites between January 2008 and December 2011. Data was analysed retrospectively.
Results:
Data was complied for 1105 eyes of 941 patients. Results revealed a mean corneal astigmatism of 1.13 ± 0.91. The corneal astigmatism was 0.50D or less in 283 eyes (25.6%), between 0.51 D and 1.00 D in 374 (38%) and between 1.01 and 1.50D in 193 eyes (17.5%). It was 1.50D or less in 850 eyes (76.9%) and more than 2.00 D in 138 eyes (12.5%), more than 2.50 D in 80 eyes (7.24%), more than 3.00D in 41 eyes (3.71%) and more than 3.50 D in 28 eyes (2.53%).
Conclusions:
Of patients selected for routine cataract surgery, 40.5% of eyes had more than 1.00 D of corneal astigmatism and 12.5% had more and 2.00D. 3.7% had more than 3.00D and 2.53% had more than 3.50D of corneal astigmatism. This shows the potential demand for toric intraocular lens insertion in this population.
Keywords: 428 astigmatism •
445 cataract •
567 intraocular lens