Accuracy of optical biometry combined with Placido disc corneal topography for intraocular lens power calculationReport as inadecuate




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Purpose

To investigate the accuracy of a new optical biometer for intraocular lens IOL power calculation in eyes undergoing cataract surgery.

Methods

Consecutive eyes of patients undergoing cataract surgery with the same IOL model were enrolled in a prospective cohort study.Axial length AL and corneal power were measured with an optical biometer based on optical low-coherence interferometry and Placido-disc corneal topography. IOL power was calculated with the Hoffer Q, Holladay 1 and SRK-T formulas. For each formula the lens constant was optimized in retrospect in order to achieve a mean prediction error PE of zero difference between the predicted and the postoperative refraction. Median absolute error MedAE and percentage of eyes with PE ±0.50 D were calculated.

Results

Seventy-four eyes of 74 cataract patients were enrolled. The MedAE was 0.25 D with all formulas. A PE within ±0.50 D was obtained in 89.04% of cases with the Hoffer Q and SRK-T formulas, and in 87.67% of cases with the Holladay 1 formula.

Conclusions

The optical biometer investigated in the present study provides accurate measurements for IOL power calculation.



Author: Giacomo Savini , Kenneth J. Hoffer, Piero Barboni, Nicole Balducci, Domenico Schiano-Lomoriello, Pietro Ducoli

Source: http://plos.srce.hr/



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