Accuracy of optical biometry combined with Placido disc corneal topography for intraocular lens power calculation.

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

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article numbere0172634
JournalPLoS One
Volume12
Issue number2
DOIs
Publication statusPublished - Feb 1 2017

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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