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40% of patients awaiting cataract surgery have 1 D or more of astigmatism

J Cataract Refract Surg. 2011;37(10):1751-1755

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A significant number of patients awaiting cataract surgery had 1 D or more of corneal astigmatism, a study found.

"The results can help hospitals analyze the demand for and cost of using toric IOLs in patients with corneal astigmatism," the study authors said.

The study comprised 1,230 eyes of 746 patients who underwent cataract surgery at one center in the United Kingdom. Mean patient age was 75.54 years. Patients younger than 30 years of age and those with previous ocular surgery, a history of corneal disease and ocular inflammation were excluded from the study.

Investigators prospectively gathered patients' biometry data over an interval of 4 months using the IOLMaster (Carl Zeiss Meditec). All patients also underwent assessments of visual acuity, refraction, slit lamp evaluation, tonometry and dilated fundus examination.

Study results showed that astigmatism was 0.5 D or less in 301 eyes (24.47%) and more than 1 D in 497 eyes (40.41%). Astigmatism was 1.5 D or more in 20.5% of eyes, 2.5 D or more in 4.61% of eyes and 3 D or more in 1.93%.

Flat and steep meridian values increased with age, the authors said.