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Margin of error up to 28% in determining IOL calculations

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GUADALAJARA, Mexico — Choosing the calculation formula and calculating IOL power carries approximately a 28% margin of error for determining correct lens power, according to one ophthalmologist speaking here.

Carlos Johnson Villalobos, MD, analyzed the difference between power calculations and the visual acuity in a total of 152 eyes, including 15 hyperopes, 92 emmetropes and 42 myopes. He presented results here at the Mexican Congress of Ophthalmology.

“Errors of 0.1 mm in the metrics of the anterior chamber affect the postoperative refraction approximately 1 D in myopes, 1.5 D in emmetropes and 2.5 D in hyperopes,” Dr. Johnson Villalobos said.

According to the study, 76% of all patients had an “adequate” visual acuity of 20/20 or 20/15. In the myopic group, there was a difference of 1.4 D in 58% of patients; 71% of emmetropes had a difference of ± 1.8 D; and 53% of hyperopes had a difference of 0.4 D, he said.

“There is a margin of error in IOL calculation of 20.39% to place an IOL of a different constant to the calculated constant, and an error of 7.89% from the selection of an inadequate formula,” Dr. Johnson Villalobos said.