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

作者：Savini Giacomo; Hoffer Kenneth J; Barboni Piero; Balducci Nicole; Schiano Lomoriello Domenico; Ducoli Pietro

来源：PLos One, 2017, 12(2): e0172634.

DOI：10.1371/journal.pone.0172634

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.

• 出版日期2017-2-23